| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 423512100 | Oxygen containing | 88 |
| 423513000 | Persulfate | 2 |
| 20140348740 | DEVICE FOR MIXING AND COOLING TWO REACTIVE LIQUIDS AND METHOD OF MAKING PEROXOMONOSULPHURIC ACID WITH THE DEVICE - A device for mixing and cooling two reactive liquids, comprising a bundle type heat exchanger with parallel tubes, a head space open to one end of all tubes, a first inlet to the head space for introducing a first liquid and a second inlet to the head space with a multitude of nozzles for introducing a second liquid, the nozzles being located within the head space and oriented to direct the introduced liquid transverse to the axis of the tubes of the tube bundle, is useful for making peroxomonosulphuric acid from 85 to 98% by weight sulphuric acid introduced into the first inlet of the device and 50 to 80% by weight aqueous hydrogen peroxide introduced into the second inlet of the device. | 11-27-2014 |
| 20150064101 | DEVICE AND METHOD FOR MAKING A DILUTE AQUEOUS SOLUTION OF PEROXOMONOSULPHURIC ACID - A device, comprising a conduit for an aqueous stream, a mixing tube located inside the conduit, having a static mixer inside the mixing tube, an outlet open to the conduit and an inlet, a sulphuric acid supply tube connected to the inlet of the mixing tube and a hydrogen peroxide supply tube, arranged inside the sulphuric acid supply tube and having an outlet for hydrogen peroxide at the inlet of said mixing tube, and a method, where an aqueous stream is passed through the conduit of the device, 85 to 98% by weight sulphuric acid is introduced to the sulphuric acid supply tube of the device and 50 to 80% by weight aqueous hydrogen peroxide solution is introduced to the hydrogen peroxide supply tube of the device, provide a dilute aqueous solution of peroxomonosulphuric acid without a risk of exposing operating personnel to concentrated peroxomonosulphuric acid. | 03-05-2015 |
| 423514000 | Thiosulfate | 3 |
| 20110262343 | PROCESS FOR PREPARATION OF CALCIUM THIOSULFATE LIQUID SOLUTION FROM LIME, SULFUR, AND SULFUR DIOXIDE - An efficient batch or semi-continuous method of production of relative high concentration, low byproduct-containing, calcium thiosulfate (CaS | 10-27-2011 |
| 20130287676 | SODIUM THIOSULFATE-CONTAINING PHARMACEUTICAL COMPOSITIONS - Provided herein are pharmaceutically acceptable sodium thiosulfate and pharmaceutical compositions thereof. Also provided herein are methods for determining the total non-purgeable organic carbon in a sodium thiosulfate-containing sample. Further provided herein are methods for producing pharmaceutically acceptable sodium thiosulfate. Still further provided herein are methods of treatment comprising the administration of pharmaceutically acceptable sodium thiosulfate. | 10-31-2013 |
| 20190144276 | SODIUM THIOSULFATE-CONTAINING PHARMACEUTICAL COMPOSITIONS | 05-16-2019 |
| 423517000 | Metal and ammonium containing | 1 |
| 20080206126 | Higher than 30% concentration lime slurries, preparation and uses thereof - The present invention relates to a composition comprising water, more than 30% w/w of calcium hydroxide, and >0.2% w/w dispersant. A process for preparing such a composition is also disclosed. The composition which can be in the form of a 45-55% concentration lime slurry is particularly useful for converting concentrated ammonium lignosulfonate into calcium lignosulfonate, for converting ammonium lignosulfonate into low sulfate calcium, potassium, sodium, or magnesium lignosulfonate and mixtures thereof, for removing soluble sulfate from concentrated sodium, potassium, ammonium or magnesium lignosulfonate or for treating a weak liquor obtained from the pulp and paper industry. | 08-28-2008 |
| 423518000 | Plural metal containing | 3 |
| 20100135896 | SIMULTANEOUS WARM GAS DESULFURIZATION AND CO-SHIFT FOR IMPROVED SYNGAS CLEANUP - The present invention involves a process and materials for simultaneous desulfurization and water gas shift of a gaseous stream comprising contacting the gas stream with a nickel aluminate catalyst. The nickel aluminate catalyst is preferably selected from the group consisting of Ni | 06-03-2010 |
| 20130243685 | Oil Extractor and The Preparation Method Thereof - A method for preparing an oil extractor is provided. The method includes dissolving 0.1˜30% by weight of a potassium sulfate, 0.1˜30% by weight of a potassium persulfate, and 0.1˜30% by weight of a manganese sulfate in a solvent to form a solution; heating the solution to synthesize a compound by a microwave; cooling a temperature of the compound to a room temperature; and removing the solvent from the compound. An extractor prepared from the method is also provided. | 09-19-2013 |
| 20160111709 | METHOD FOR PREPARING AN AMORPHOUS FILM MADE FROM LITHIATED METAL SULFIDE OR OXYSULFIDE - A method of preparing an amorphous film of lithiated metal sulfide or oxysulfide of formula Li | 04-21-2016 |
| 423519000 | Bisulfite | 1 |
| 20100008845 | PROCESS FOR PRODUCTION OF SODIUM BISULFITE - Processes for producing sodium bisulfite from sodium sulfite purge streams are disclosed which enable recovery of additional resource material including sodium bisulfite. | 01-14-2010 |
| 423519200 | Sulfite | 1 |
| 20140170058 | PROCESS FOR THE REMOVAL OF PALLADIUM FROM 4-AMINO-3-HALO-5-FLUORO-6-(ARYL) PYRIDINE-2-CARBOXYLATES AND 4-AMINO-3-HALO-6-(ARYL)PYRIDINE-2-CARBOXYLATES - Residual palladium is removed and recovered from 4-amino-3-halo-5-fluoro-6-(aryl)pyridine-2-carboxylates and 4-amino-3-halo-6-(aryl)pyridine-2-carboxylates by treatment with an aqueous solution containing from about 20 to about 50% of an alkali metal bisulfite at a temperature from about 60 to about 90° C. and a pH from about 3.8 to about 7.0. | 06-19-2014 |
| 423521000 | Ternary compound containing hydrogen | 34 |
| 423522000 | Sulfuric acid | 34 |
| 20080226540 | Ruthenium Oxide Catalysts for Conversion of Sulfur Dioxide to Sulfur Trioxide - The present invention relates generally to catalysts comprising ruthenium oxide and to processes for catalyzing the oxidation and conversion of sulfur dioxide (SO | 09-18-2008 |
| 20080253957 | Process and Plant for Producing Sulfuric Acid - There are described a process and a plant for producing sulfuric acid by catalytic oxidation of SO | 10-16-2008 |
| 20100061922 | METHOD FOR PRODUCING HYDROGEN AND SULPHURIC ACID - The invention relates to a method for producing gaseous hydrogen and strong sulphuric acid (97-100 wt-%) simultaneously from sulphur dioxide gas and water. Sulphur dioxide gas stream is divided into two separate sub-streams, the first sub-stream is routed for water decomposition in a partial thermochemical cycle of the hydrogen and sulphuric acid production and the second sub-stream is fed to the oxidation of the sulphur dioxide to sulphur trioxide. | 03-11-2010 |
| 20100068127 | PROCESS FOR THE PRODUCTION OF SULPHURIC ACID - Process for the production of concentrated sulphuric acid and oleum from feed gases with up to 70% SO | 03-18-2010 |
| 20100254889 | METHOD FOR PRODUCING SULFURIC ACID - A process for preparing sulfuric acid, in which process gases comprising sulfur dioxide are obtained by combustion of liquid sulfur by means of process air introduced from the outside or by dissociation of waste sulfuric acids and the sulfur dioxide in the process gases comprising sulfur dioxide is oxidized to sulfur trioxide and converted into sulfuric acid by the contact process, wherein the process air which is introduced from the outside for combustion of sulfur or the process gases comprising sulfur dioxide which are obtained by dissociation of waste sulfuric acid have their water vapor content reduced by cooling them, is proposed. | 10-07-2010 |
| 20100284899 | GENERATION OF SULFUR TRIOXIDE AND SULFURIC ACID - Configurations herein include a novel process and apparatus for generating and maintaining sulfur trioxide gas. The generation system and process operate to provide sulfur trioxide calibration gas for calibrating sulfur trioxide detection devices. The system and process provides a known, concentration of sulfur trioxide gas via a heated catalyst, which enables accurate calibration of measurement equipment. The system functions in part by controlling temperature, amount of moisture, residence time, catalyst selection, diluting generated sulfur trioxide and by locating the sulfur trioxide generator at a point of injection of a sulfur trioxide detection system. | 11-11-2010 |
| 20110311433 | PROCESS AND SYSTEM FOR PRODUCTION OF CONCENTRATED SULPHURIC ACID FROM OFF-GAS - A process and system for production of concentrated sulphuric acid from sulphuric acid by stripping the sulphuric acid with dried air. The concentration of the sulphuric acid is 90-98% by weight, and the concentration of the concentrated sulphuric acid is 95-98.8% by weight. The air is dried in a dehumidifier. The sulphuric acid can be formed by cooling and condensing of a sulphur trioxide/water containing off-gas thus forming the sulphuric acid. The cooling and condensing can take place in an air cooler, and if an absorption dryer is used, it can be regenerated by warm air being cooling air transferred from the outlet of the air cooler. | 12-22-2011 |
| 20120087856 | GENERATION OF SULFUR TRIOXIDE AND SULFURIC ACID - Configurations herein include a novel process and apparatus for generating and maintaining sulfur trioxide gas. The generation system and process operate to provide sulfur trioxide calibration gas for calibrating sulfur trioxide detection devices. The system and process provides a known, concentration of sulfur trioxide gas via a heated catalyst, which enables accurate calibration of measurement equipment. The system functions in part by controlling temperature, amount of moisture, residence time, catalyst selection, diluting generated sulfur trioxide and by locating the sulfur trioxide generator at a point of injection of a sulfur trioxide detection system. | 04-12-2012 |
| 20120171110 | METHOD AND SYSTEM FOR THE PRODUCTION OF SULFURIC ACID - The invention relates to a method and an installation for producing sulfuric acid. First of all, a product gas flow ( | 07-05-2012 |
| 20120308473 | METHOD AND APPARATUS FOR ADJUSTING THE CONCENTRATION OF ACIDS OR LYES - A method for adjusting a concentration of an acid or lye includes charging a medium for adjusting the concentration of the acid or lye into a supply conduit of the acid or lye so as to provide a combined stream. The combined stream is supplied through an inlet to a mixing chamber such that the combined stream is deflected upon entering the mixing chamber. The combined stream is mixed in the mixing chamber. The combined stream is discharged through an outlet of the mixing chamber such that the combined stream is again deflected upon being discharged from the mixing chamber. | 12-06-2012 |
| 20130071314 | PROCESS FOR PRODUCING HYDROGEN, SULFUR AND SULFUR DIOXIDE FROM HYDROGEN SULFIDE-CONTAINING GAS STREAMS - A process for making molecular hydrogen, elemental sulfur and sulfur dioxide from hydrogen sulfide. The process involves contacting a gas stream of hydrogen sulfide within a contacting zone with a contacting composition comprising metal sulfide in a lower sulfided state and yielding from the contacting zone a product gas stream comprising hydrogen and a recovered contacting composition comprising metal sulfide in a higher sulfided state. The higher metal sulfide is regenerated with oxygen to yield elemental sulfur and sulfur dioxide. | 03-21-2013 |
| 20130236389 | METHOD FOR INCREASING THE SULFURIC ACID CONCENTRATION OF A SULFURIC ACID SOLUTION - Described is a method of increasing the sulfuric acid concentration of a first aqueous sulfuric acid solution with a sulfuric acid concentration of 82-89% to a concentrated sulfuric acid solution with a sulfuric acid concentration of at least 90%, including evaporating water from the first aqueous sulfuric acid solution in an evaporator vessel to the concentrated sulfuric acid solution, pumping around a mixture of the first aqueous sulfuric acid solution, part of the concentrated sulfuric acid solution, a second aqueous sulfuric acid solution, and hydrogen peroxide through an enameled piping system comprising the evaporator vessel and one or more heaters and pumps, wherein the piping system is operating at a temperature of at least 180° C., and the sulfuric acid concentration of the second aqueous sulfuric acid solution is at least 90%. | 09-12-2013 |
| 20130336876 | Low Temperature Sulphur Dioxide Oxidation Catalyst for Sulfuric Acid Manufacture - Improved catalysts for oxidation of sulfur dioxide which are alkali metal-promoted vanadium catalysts which are further promoted by gold. Improved methods employing such catalyst for oxidation of sulfur dioxide and for manufacture of sulfuric acid. Improved methods for multiple step oxidation of sulfur dioxide in which the last oxidation step is carried out employing improved catalysts of this invention at temperatures lower than 400° C. | 12-19-2013 |
| 20140079624 | ENERGY RECOVERY IN MANUFACTURE OF SULFURIC ACID - This invention relates to the recovery of energy in the manufacture of sulfuric acid, and more particularly to enhanced recovery of energy from the absorption of wet SO | 03-20-2014 |
| 20140219910 | SULPHURIC ACID PRODUCTION WITH RECYCLE OF DESULPHURIZED GAS - The invention relates to a process for oxidation of SO | 08-07-2014 |
| 20150147266 | PROCESS FOR THE OXIDATION OF SO2 TO SO3 - The present invention relates to a process plant for the oxidation of SO | 05-28-2015 |
| 20150315022 | CONTACT APPARATUS FOR OXIDIZING SULFUR DIOXIDE AND SYSTEMS FOR PRODUCING SULFURIC ACID - A method is disclosed for oxidizing sulfur dioxide using the contact process in which a gas stream comprising the sulfur dioxide and oxygen itself is used as the cooling medium in a contact apparatus comprising a double pipe heat exchanger. In associated systems for producing sulfuric acid, certain heat exchangers can be omitted thereby allowing for simpler and less expensive systems. The invention is suitable for systems using either a single or, in particular, a double absorption process. Further, the invention is suitable in new systems or in a retrofit of existing systems. | 11-05-2015 |
| 423523000 | Nitrogenous impurity or utilizing nitrogenous catalyst or reactant | 2 |
| 20100233069 | METHOD AND SYSTEM FOR CONCENTRATING WASTE SULPHURIC ACIDS FROM NITRATION PROCESSES - Disclosed is a method for recovering diluted waste sulfuric acid containing impurities from nitration processes, a highly concentrated nitric acid required in the nitration process being produced in association with the nitration process by means of extractive rectification with concentrated sulfuric acid which is re-concentrated in order to be reutilized. According to the inventive method, the waste sulfuric acid from the nitration process is fed to the top of a first, indirectly heated stripping column, optionally together with another waste sulfuric acid in the form of a DNT washing acid, and is divided into an overhead product containing nitric acid and nitro-organic compounds as well as a prepurified sulfuric acid in the bottom product. The prepurified sulfuric acid withdrawn from the bottom of the first stripping column is fed to the top of a second, serially connected additional indirectly heated stripping column, into the bottom zone of which another waste sulfuric acid is fed in the form of a diluted sulfuric acid recovered from the nitric acid concentration system such that the prepurified sulfuric acid from the first stripping column is further purified in the second stripping column and is preconcentrated along with the diluted sulfuric acid recovered from the extractive rectification of nitric acid. | 09-16-2010 |
| 20140205534 | METHOD FOR PREPARING SULFURIC ACID BY USING HYDROGEN SULFIDE - Provided is a method for preparing sulfuric acid by using hydrogen sulfide. The method comprises the following steps: (1) performing a reduction-oxidation reaction between an H | 07-24-2014 |
| 423525000 | Starting material includes organic or carbonaceous impurity | 2 |
| 20130108541 | PROCESS FOR DIRECTLY PRODUCING SULFUR TRIOXIDE AND SULFURIC ACID USING GYPSUM AS RAW MATERIAL | 05-02-2013 |
| 423528000 | Contacting mixture with gas, steam, or vapor | 1 |
| 20150298056 | DESULFURIZATION METHOD AND DEVICE FOR SULFURIC ACID PRODUCTION DEVICE - This desulfurization device is for desulfurizing a discharge gas which contains sulfur oxides and which was discharged from a device for sulfuric acid production that includes a concentrated-sulfuric-acid production step in which sulfur trioxide gas obtained by oxidizing sulfur dioxide gas is absorbed in an aqueous sulfuric acid solution while supplying water thereto to thereby produce sulfuric acid having a concentration as high as 90 wt % or more but less than 99 wt %, the desulfurization device comprising: a desulfurization tower in which the sulfur oxides are removed from the discharge gas and, simultaneously therewith, dilute sulfuric acid is formed from the sulfur oxides; and a dilute sulfuric acid mixer which, in the concentrated-sulfuric-acid production step, mixes the dilute sulfuric acid with the aqueous sulfuric acid solution. | 10-22-2015 |
| 423529000 | Subjecting reactants to pressure, vacuum, or steam | 5 |
| 20090269272 | PROCESS AND PLANT FOR THE PRODUCTION OF SULPHURIC ACID - The invention relates to a process and plant for producing sulphuric acid by catalytic oxidation of SO | 10-29-2009 |
| 20110318260 | MANUFACTURE METHOD OF ULTRA-PURE SULFURIC ACID - The present invention provides a method of manufacturing ultra-pure sulfuric acid. Industrial sulfur trioxide is used as the raw material, gasifying it in a round gasifier, getting it gasified for the second time after condensation, sulfur trioxide gas has been purified. Absorbing the sulfur trioxide gas with the dilute sulfuric acid circularly, collect the target product of ultra-pure sulfuric acid. The main content of the ultra-pure sulfuric acid obtained by the method of the present invention can reach more than 96 wt %, the content of the impurities of metal ions is in conformity with the SEMI C12 standard. Furthermore, secondary gasification is applied in the present invention to improve the purity of sulfur trioxide, the purified sulfur trioxide was absorbed by dilute sulfuric acid with different concentration circularly, and overcome the shortcomings, such as the unstable quality of the product which produced in the traditional production methods, the high content of the impurities of metal ions, high energy consumption, high cost and easy to cause pollution, so this invention is more suitable for large-scale continuous production. | 12-29-2011 |
| 20130115159 | ENERGY RECOVERY IN MANUFACTURE OF SULFURIC ACID - This invention relates to the recovery of energy in the manufacture of sulfuric acid, and more particularly to enhanced recovery of energy from the absorption of wet SO | 05-09-2013 |
| 20140322125 | RECOVERY OF SULFUR TRIOXIDE HEAT OF ABSORPTION - A contact process for manufacture of sulfuric acid is disclosed in which the vapor phase heat of formation of sulfuric acid in the sulfur trioxide conversion gas and the heat of absorption of SO | 10-30-2014 |
| 20150139891 | ENERGY RECOVERY IN MANUFACTURE OF SULFURIC ACID - This invention relates to the recovery of energy in the manufacture of sulfuric acid, and more particularly to enhanced recovery of energy from the absorption of wet SO | 05-21-2015 |
| 423531000 | Purifying acid or reactant | 8 |
| 20090317321 | DECOMPOSITION OF SPENT SULFURIC ACID USING OXYGEN - Spent sulfuric acid is decomposed by atomizing it with an oxygen-containing stream into a decomposition furnace. | 12-24-2009 |
| 20100015035 | METHOD OF PRODUCING SULFURIC ACID AND INSTALLATION FOR CARRYING OUT THE METHOD - The invention relates to a method of producing sulfuric acid wherein an SO | 01-21-2010 |
| 20100284900 | METHOD FOR RECOVERING SULFURIC ACID FROM CONCENTRATED ACID HYDROLYSATE OF PLANT CELLULOSE MATERIAL - A method for recovering sulfuric acid from concentrated acid hydrolysate of plant cellulose material is disclosed. In some of the examples, the concentrated acid hydrolysate is mixed with a liquid organic precipitant, thereby the sugars in the hydrolysate is precipitated and separated out, and the remained is sulfuric acid and an organic solvent solution. Then the organic solvent is separated by distillation or extraction, thereby obtaining the pure sulfuric acid solution. This precipitation method can recover above 90% sugars and acids with a small amount of organic precipitant, which greatly reduces the recover cost. In the other examples, the method includes: mixing the concentrated acid hydrolysate with a water-immiscible alcohol, thereby separating the sugars with a remainder of acid-alcohol solution containing sulfuric acid; contacting the acid-alcohol solution with water, thereby the sulfuric acid enters into the water phase from the organic phase; then separating the organic phase and the water phase, thereby obtaining the sulfuric acid solution. This method avoids the use of poisonous, inflammable and explosive organic solvents and also avoids the energy consumption for recovering these organic solvents, thereby greatly reducing the cost of acid recovery. | 11-11-2010 |
| 20110129410 | METHOD FOR RECYCLING USED LEAD ACID BATTERIES ELECTROLYTIC SOLUTION - “METHOD FOR RECYCLING USED LEAD ACID BATTERIES ELECTROLYTIC SOLUTION”, especially the automotive batteries, has the following stages: the sulfuric acid solution derived from the cutting of batteries goes through a drying bed (quick filters) which is composed of a layer of crushed rocks, “bidim” and sand or through a press filter for the retaining of the solid particles, after the solution goes through these filters, it goes through to a reactor where it suffers a forced decantation process for retaining the heavy metals and contaminants; the forced decantation process is carried out by adding 20 liters of aluminum dioxide, 20 kilos of lime (in the form of milk of lime), 2 liters of aluminum polychloride (flocculent) and 200 grams of acrylic acid acrylamide (polymer, used diluted in water) to every 10,000 liters of sulfuric acid under shaking, it is then left at rest for 40 minutes for decantation, soon after decantation the floating part goes through a bag filter with a polyethylene sheet filter and then through a 5-micre cartridge filter, then it is sent to a reservoir and it is stored; the decanted part is sent to the drying beds for retaining the flocculent materials and the percolated one goes to the reprocessing method as described above; when reaching the storage tanks, the solution has low levels of lead, between 3 ppm and 5 ppm. In order to assure a greater safety of the process during the loading of the containers that will carry the recycled product, the solution goes through polyester filters for being sent to the other companies as raw material. | 06-02-2011 |
| 20120301389 | METHOD FOR THE SEPARATION OF A NON-VOLATILE STRONG ACID FROM A SALT THEREOF AND COMPOSITIONS PRODUCED THEREBY - The present invention provides an organic phase composition comprising
| 11-29-2012 |
| 20130302240 | METHOD FOR PURIFICATION OF SPENT SULFURIC ACID FROM TITANIUM DIOXIDE RUTILE INDUSTRY - A method for the purification of spent sulfuric acid and particularly the purification of spent acid, from titanium dioxide rutile manufacture through a chloride route, is provided. In the chloride route of titanium dioxide manufacture, sulfuric acid is used to clean the un-reacted gaseous flow coming out of the oxidizer, so the spent acid mainly contains un-reacted Ti | 11-14-2013 |
| 20140056802 | PROCESS FOR PRODUCING SULFURIC ACID WITH LOW LEVELS OF NITROGEN OXIDES - A process for producing sulfuric acid with reduced levels of nitrogen oxides (NO | 02-27-2014 |
| 20160023901 | METHOD AND APPARATUS FOR RECYCLING WASTE SULFURIC ACID - A method and an apparatus for recycling waste sulfuric acid solution are provided. The method includes providing a reaction tank and introducing a waste sulfuric acid (H | 01-28-2016 |
| 423532000 | Sulfur trioxide | 3 |
| 423533000 | Utilizing catalyst in reaction | 3 |
| 20100092374 | PROCESS AND APPARATUS FOR THE CATALYTIC OXIDATION OF SO2-CONTAINING GASES BY MEANS OF OXYGEN - Process for the continuous catalytic complete or partial oxidation of a starting gas containing from 0.1 to 66% by volume of sulphur dioxide plus oxygen, in which the catalyst is kept active by means of pseudoisothermal process conditions with introduction or removal of energy; apparatus for the continuous catalytic complete or partial oxidation of a starting gas containing sulphur dioxide and oxygen having at least one tube contact apparatus in the form of an upright heat exchanger composed of at least one double-walled tube whose catalyst-filled inner tube forms a reaction tube, with heat being transferred in cocurrent around the reaction tube and an absorber for separating off SO | 04-15-2010 |
| 20130295001 | PROCESS FOR PRODUCING SULFUR DIOXIDE AND SULFUR TRIOXIDE | 11-07-2013 |
| 423535000 | Catalyst contains oxygen, vanadium, and another metal | 1 |
| 20110250124 | CATALYST FOR THE OXIDATION OF SO2 TO SO3 - The invention relates to a catalyst for the oxidation of SO | 10-13-2011 |
| 423539000 | Sulfur dioxide | 8 |
| 20120034154 | PRODUCTION OF HYDROGEN THROUGH OXIDATION OF METAL SULFIDES - Utilization of process and equipment for oxidation of metal sulfides, preferably two step metal sulfide oxidation reactions, and more preferably with looping back of second step oxide to the first step as an oxidizing agent, to generate sulfur dioxide and a useful metal or metal oxide, and react the sulfur dioxide with halogen (iodine or bromine) and water to produce sulfuric and halogen acid under moderate process conditions and equipment requirements and then dissociating the halogen acids (HI or HBr) to halogen and hydrogen as an overall environmentally and cost efficient and otherwise acceptable safe process for producing hydrogen and other useful products. | 02-09-2012 |
| 20130280159 | CATALYST FOR DECOMPOSITION OF SULFUR TRIOXIDE AND HYDROGEN PRODUCTION PROCESS - To provide a sulfur trioxide decomposition catalyst, particularly, a sulfur trioxide decomposition catalyst capable of lowering the temperature required when producing hydrogen by an S—I cycle process. | 10-24-2013 |
| 20140086823 | CATALYST FOR DECOMPOSITION OF SULFUR TRIOXIDE AND HYDROGEN PRODUCTION PROCESS - A sulfur trioxide decomposition catalyst, in particular, a sulfur trioxide decomposition catalyst capable of lowering the temperature required when producing hydrogen by an S—I cycle process is disclosed. A sulfur trioxide decomposition catalyst that includes a composite oxide of tungsten, vanadium and at least one metal selected from the group consisting of transition metal and rare earth elements is provided. Also, a sulfur dioxide production process that includes decomposing sulfur trioxide into sulfur dioxide and oxygen by using the sulfur trioxide decomposition catalyst above is provided. Furthermore, a hydrogen production process, wherein the reaction of decomposing sulfur trioxide into sulfur dioxide and oxygen by an S—I cycle process is performed by the above-described sulfur dioxide production process is provided. | 03-27-2014 |
| 20140294718 | NOVEL SULFUR DIOXIDE AND/OR SULFUR DIOXIDE HYDRATE ABSORBENT - Disclosed is an sorbent for removing sulfur dioxide (SO | 10-02-2014 |
| 423542000 | Burning or roasting a sulfur compound | 2 |
| 20120244064 | DEVICE AND METHOD FOR THE COMBUSTION OF SULFUR AND SULFURIC COMPOUNDS - The present invention relates to a process and a device for the combustion of sulphur and/or sulphur-containing compounds, with formation of sulphur dioxide. | 09-27-2012 |
| 20130017144 | METHOD AND DEVICE FOR PROCESSING SOUR GAS RICH IN CARBON DIOXIDE IN A CLAUS PROCESSAANM Menzel; JohannesAACI WaltropAACO DEAAGP Menzel; Johannes Waltrop DE - A method and apparatus for processing a sour gas rich in carbon dioxide in a Claus process, so sulfur compounds are removed by a selective solvent in a gas scrubbing process. Sulfur components and carbon dioxide, are separated into at least two sour gas fractions, wherein at least one sour gas fraction having a higher content of sulfur components is obtained, wherein the fraction having the highest hydrogen sulfide content is introduced in the thermal reaction stage of the Claus furnace with a gas containing oxygen by means of a burner. The sulfur is converted to sulfur dioxide in the thermal reaction stage of the Claus furnace and exhaust gases are discharged into the closed Claus reaction chamber behind the burner. The remaining sour gas fractions stripped of sulfur components are fed to the Claus reaction chamber and are mixed with the combustion gases leaving the burner. | 01-17-2013 |
| 423543000 | Burning sulfur | 2 |
| 20090068088 | PROCESS AND APPARATUS FOR THE COMBUSTION OF SULFUR - A process for a combustion of sulfur with an oxygen-containing gas to produce sulfur dioxide. The process includes introducing the sulfur and the oxygen-containing gas to a furnace. The sulfur is evaporated and subsequently a portion of the sulfur is oxidized to sulfur dioxide under sub-stoichiometric conditions in a first portion of the furnace. The sulfur dioxide formed in the first furnace portion is introduced together with any unoxidized sulfur to a second portion of the furnace which is disposed adjacent to the first furnace portion. The sulfur dioxide and unoxidized sulfur are subjected to post-combustion with the oxygen-containing gas in an inlet of a downstream waste heat boiler. | 03-12-2009 |
| 20140004034 | PROCESS FOR THE COMBUSTION OF A LIQUID | 01-02-2014 |
| 423544000 | Sulfate | 32 |
| 20120315214 | METHOD FOR PREPARING MANGANESE SULFATE MONOHYDRATE - Provided is a method for preparing manganese sulfate monohydrate, which comprises the following steps: (1) reacting MnO with (NH | 12-13-2012 |
| 20120321546 | METHOD FOR PREPARING MANGANESE SULFATE MONOHYDRATE - Provided is a method for preparing manganese sulfate monohydrate, which comprises the following steps: (1) adding equimolar BaS or SrS solution into manganese sulfate solution to carry out reaction fully, and separating and washing the obtained solid; (2) mixing the solid with deionized water to prepare a slurry, dissolving the slurry with concentrated sulfuric acid, and separating solid from liquid to obtain MnSO | 12-20-2012 |
| 20150329375 | METHOD FOR PRODUCING HIGH-PURITY NICKEL SULFATE AND METHOD FOR REMOVING IMPURITY ELEMENT FROM SOLUTION CONTAINING NICKEL - Provided are an impurity-element removing method for selectively removing magnesium from a nickel-containing solution, and a method for producing high-purity nickel sulfate using the impurity-element removing method. The production method includes a production process in the production method of producing high-purity nickel sulfate from a nickel-containing solution, and the nickel-containing solution in the production process is subjected to an impurity-element removal treatment that includes: a hydroxylation step of adding an alkali hydroxide to the nickel-containing solution in the production process to form a hydroxylated slurry; a carbonation step of adding an alkali carbonate to the hydroxylated slurry to form a carbonated slurry, and recovering nickel component from the solution; a solid-liquid separation step for the slurry thus obtained; and a neutralization step of subjecting a solution after reaction obtained by solid-liquid separation to a neutralization, and recovering an impurity element included in the nickel-containing solution in the production process. | 11-19-2015 |
| 423545000 | Ammonium containing | 9 |
| 20140017161 | METHOD FOR PRODUCTION OF ORGANIC AMMONIUM SULFATE USING CAPTURED NH3 AND NH4 PRODUCED BY AEROBIC COMPOSTING - An aerobic composting process for producing an organic ammonium sulfate product is provided, including providing an enclosed composting apparatus for decomposition of a source of nitrogen; mixing said source of nitrogen with a source of carbon, thereby creating a biomass having a high solids content; moving said biomass down the composting trench as the aerobic composting process progresses; providing aerobic bacteria to highly selectively convert the available nitrogen compounds from said biomass into NH3 and/or NH4 and CO2 without addition of external heat; capturing the NH3 and/or NH4 and CO2 from the atmosphere of the composting apparatus in an aqueous solution; adding a source of sulfate to said aqueous solution containing captured NH3 and/or NH4 and CO2; and processing said aqueous solution containing a source of sulfate and captured NH3 and/or NH4 and CO2 to obtain preferrably organic ammonium polycarbonate and/or solid or concentrated liquid ammonium sulfate product. | 01-16-2014 |
| 20140314657 | NUTRIENT RECOVERY SYSTEMS AND METHODS - Methods, systems, and apparatuses for anaerobic digestion of waste fibrous material and the recovery of nutrients are provided. Methods, systems, and apparatuses disclosed herein provide mechanisms to release dissolved gases from anaerobic digester effluent. Methods, systems and apparatuses disclosed herein can recover one or more nutrients from anaerobic digested effluent using a range of temperatures, aeration rates, aeration times, pH ranges, and settling times. | 10-23-2014 |
| 20160159657 | PROCESS AND APPARATUS FOR PRODUCING AMMONIUM SULFATE CRYSTALS - The present invention provides a continuous process for producing ammonium sulfate crystals, wherein said process comprises:
| 06-09-2016 |
| 423548000 | Using metal sulfate as reactant | 1 |
| 20150344318 | RECYLING METHOD OF PURE AMMONIUM SULFATE AQUEOUS SOLUTION - Provided is a method of recycling a high purity ammonium sulfate aqueous solution including: adding slurry obtained by mixing water, aqueous ammonia, and gypsum with each other and a predetermined amount of carbon dioxide to a reactor to performing a carbonation reaction, wherein an ammonium sulfate aqueous solution produced in the reactor is circulated in the reactor. | 12-03-2015 |
| 423549000 | Employing sulfuric acid as reactant | 5 |
| 20110229403 | Gaseous Ammonia Removal System - A system and method for passive capture of ammonia in an enclosure containing material that gives off ammonia. The invention allows for the passage of gaseous NH | 09-22-2011 |
| 20120063991 | METHOD OF TREATING AN ACID GAS STREAM AND AN APPARATUS THEREFOR - The present invention provides a method of treating an acid gas stream ( | 03-15-2012 |
| 20130064755 | Method for the Manufacture of an Ammonium Sulfate Composition - The present invention describes a method manufacture of an ammonium sulfate composition having a total organic carbon (TOC) content of 1% by weight or less than 1% by weight, based on the total weight of the composition, comprising the following steps:
| 03-14-2013 |
| 20130164211 | Process for Producing Ammonium Salts - In one embodiment, the invention is to a process for purifying a by-product stream. The process comprises the step of providing a by-product stream comprising an ammonium salt, dimerized amide, and optionally water. The process further comprises the step of precipitating at least a portion of the dimerized amide in the by-product stream to form solid dimerized amide. The process further comprises the step of separating the solid dimerized amide from the by-product stream to form a treated by-product stream comprising less than 1 wt. % solid dimerized amide. | 06-27-2013 |
| 20130177495 | NITROGEN-CONTAINING COMPOSITION AND PROCESS FOR PRODUCING THE SAME - The invention provides a process comprising: a crystallization step of concentrating and crystallizing the ammonium salt of sulfuric acid from an aqueous solution that contains the ammonium salt of sulfuric acid; a solid-liquid separation step of solid-liquid separating the ammonium salt of sulfuric acid obtained in the crystallization step, and a crystallization mother liquid recycling step of recycling a crystallization mother liquid obtained in the solid-liquid separation step to at least one step selected from the crystallization step and one or more steps that precede the crystallization step, in which not all of the crystallization mother liquid is recycled. | 07-11-2013 |
| 423551000 | Alkali metal containing (Li, Na, K, Rb, or Cs) | 5 |
| 20090104106 | Separation of Purified Potassium Sulfate from Glaserite - A method can, in one general aspect, include steps for the recovery of potassium sulfate and mirabilite from glaserite. In another general aspect, a method includes dissolving glaserite in water at an elevated temperature to produce a saturated or nearly saturated solution, and cooling the solution to a temperature where potassium sulfate and mirabilite will crystallize from the solution as stable phases. In yet another general aspect, a method includes adding glaserite to a saturated solution of glaserite in water and mixing for enough time at a temperature where the glaserite will decompose into potassium sulfate and mirabilite as stable phases. In yet another general aspect, a method includes separating potassium sulfate from mirabilite using a froth floatation process. | 04-23-2009 |
| 20140072507 | METHODS OF PROCESSING SOLUTIONS OF POTASSIUM SULFATE AND MAGNESIUM SULFATE, METHODS OF PRODUCING POTASSIUM SULFATE, AND RELATED SYSTEMS - Methods of processing an aqueous solution comprising potassium sulfate and magnesium sulfate include crystallizing K | 03-13-2014 |
| 423552000 | Utilizing chloride as reactant | 2 |
| 20100266482 | Process for the Time Recovery of Sulphate of Potash (SOP) From Sulphate Rich Bittern - The present invention relates to a process for the recovery of sulphate of potash (SOP) from bittern. Kainite is obtained by fractional crystallization of the bittern. Kainite is converted into schoenite with simultaneous removal of NaCl and the filtrate (SEL) is used for production of KCl. Schoenite is reacted with aqueous KCl to yield SOP and the filtrate (KEL) is recycled in the kainite to schoenite conversion step. The production of KCl from SEL is carried out with the aid of dipicrylamine (DPA). Lime is treated with DPA in water for the production of highly soluble Ca (DPA)2, which in turn treated with SEL to produce insoluble K(DPA). K(DPA) is treated with HCl to produce KCl and insoluble DPA, which can be recycled for the production of Ca (DPA)2. The aqueous KCl thus obtained is treated with schoenite to prepare SOP. The KEL obtained along with SOP is recycled to generate schoenite. | 10-21-2010 |
| 20120321547 | METHOD AND SYSTEM FOR THE PRODUCTION OF POTASSIUM SULFATE FROM POTASSIUM CHLORIDE - A method and a system for the production of potassium sulfate. The method comprises reacting a source of water soluble potassium with a magnesium sulfate-containing substance in presence of an aqueous alcoholic solution. The system comprises a first reactor for dissolving a water soluble potassium in water into a first solution; a second reactor for dissolving magnesium sulfate hydrate in water and adding methanol into a second solution; a third reactor, adapted to receive the first and the second solutions, mixed then under stirring and cool them down into a slurry; a filter collecting and filtering the slurry from the third reactor; delivering, after rinsing of the solid part with methanol, chloride-free potassium sulfate, and a combined filtrate and rinsings; a column receiving and distilling the combined filtrate and rinsings, delivering methanol back to the second reactor and to the filter and a concentrated solution of magnesium chloride; a fourth reactor, adapted to receive the concentrated solution of magnesium chloride, which crystallizes upon cooling, and to treat the concentrate with sulfuric acid, delivering hydrochloric acid and a residual mass; a collector, adapted to absorb the hydrochloric acid delivered form the fourth reactor; and a fifth reactor, adapted to collect and crystallise the residual mass from the fourth reactor, for recycling to the second reactor as magnesium sulfate heptahydrate. | 12-20-2012 |
| 423553000 | Dehydrating | 1 |
| 20120207666 | PROCESSING OF MANGANOUS SULPHATE/DITHIONATE LIQUORS DERIVED FROM MANGANESE RESOURCE MATERIAL - The process concerns hydrometallurgical processing of manganese sulphate and manganese dithionate containing liquors and recovery of water therefrom. Sodium sulphate and/or sodium dithionate containing liquors are derived from manganese sulphate and manganese dithionate containing liquids, which are then cooled to produce crystals of sodium sulphate decahydrate and sodium dithionate dehydrate. The sodium sulphate decahydrate and sodium dithionate dehydrate crystals are then heated to a temperature sufficient to decompose the sodium sulphate decahydrate crystals to form anhydrous sodium sulphate crystals, sodium dithionate hydrate crystals and water, after which water is removed from the sodium sulphate and sodium dithionate hydrate crystal. The sodium sulphate and sodium dithionate dehydrate crystals are then heated to form anhydrous sodium sulphate, sulfur dioxide and water or steam. The anhydrous sodium sulphate is then separated from the sulfur dioxide and water. | 08-16-2012 |
| 423554000 | Alkaline earth metal containing (Mg, Ca, Sr, or Ba) | 14 |
| 20110014116 | PROCESS FOR CONTINUOUS PRODUCTION OF FIBROUS BASIC MAGNESIUM SULFATE PARTICLE - Fibrous basic magnesium sulfate particles are continuously produced by the process comprising the following steps: (1) placing in a reaction vessel a seed particle-containing aqueous dispersion comprising fibrous basic magnesium sulfate seed particles dispersed in an aqueous medium; (2) supplying magnesium hydroxide and magnesium sulfate continuously into the reaction vessel under heating and stirring the seed particle-containing aqueous dispersion, whereby depositing basic magnesium sulfate produced by the reaction between the magnesium sulfate and magnesium hydroxide in the presence of water on the surfaces of the fibrous basic magnesium sulfate seed particles, to give an aqueous dispersion containing an increased amount of fibrous basic magnesium sulfate particles; (3) taking the aqueous dispersion obtained in the step (2) continuously out of the reaction vessel; and (4) recovering fibrous basic magnesium sulfate particles from the aqueous dispersion taken out of the reaction vessel. | 01-20-2011 |
| 20120063992 | PROCESS FOR THE PRODUCTION OF NANOPARTICLES USING MINIEMULSIONS - The present invention relates to a process for the production of nanoparticles or nanostructured particles with the help of a 2-emulsion method, particles being produced through targeted coalescence of miniemulsions in a high-pressure homogenized. | 03-15-2012 |
| 20140120031 | PASSIVE SPIRAL MICROMIXER AND ITS APPLICATIONS - A micro-mixer and use thereof for synthesis of barium sulfate particles is disclosed. The micro-mixer includes feeding tubes, reservoirs, a mixing channel, a buffer reservoir and a sampling tube. The mixing channel is made of hydrophobic materials and processed into a spiral structure, in which baffles are set in interval arrangement at both sides of the channel wall. The types of the baffles include leaning-forward baffles, vertical baffles and leaning-backward baffles. Setting the baffles helps produce local secondary flow in the mixer, which enhances fluids mixing process. The micro-mixer is suitable to rapid reactions or precipitation processes, whose reaction time is much less than mixing time, and has broad application prospects in many fields involving mixing reaction such as pharmaceutical and chemistry industry. | 05-01-2014 |
| 423555000 | Calcium | 11 |
| 20090257946 | METHOD AND APPARATUS FOR PRESSURIZED CALCINATION OF GYPSUM - A method for calcining gypsum in a pressurized reactor by injecting combustion gases and air into the pressurized reactor to create a fluidized bed of gypsum, and heating the fluidized bed of gypsum in the pressurized reactor sufficiently to form a calcined hemihydrate. | 10-15-2009 |
| 20100034727 | PROCESS FOR PRODUCING GYPSUM - The invention relates to a process for the preparation of a gypsum product wherein calcium sulphate hemihydrate and/or calcium sulphate anhydrite and water are contacted so that the calcium sulphate hemihydrate and/or calcium sulphate anhydrite and the water react with each other and form a gypsum product. The reaction mixture has a dry matter content of 34-84% by weight in order to obtain a gypsum product which consists of crystals that are small, flat and of as equal size as possible. The invention also relates to a product prepared by this process. A gypsum product is formed which consists of essentially intact crystals having a size of between 0.1 and below 2.0 μm. The products are applicable e.g. as fillers or coating pigments in e.g. paper industry. | 02-11-2010 |
| 20100086474 | Process for Preparing alpha Calcium Sulfate Hemihydrate - The invention provides a process for preparing α-calcium sulfate hemihydrate which comprises the following steps: adding aqueous solutions containing sulfate ions and calcium ions to calcium chloride solution with a range of concentration; reacting the mixture of a) at a range of temperature for an appropriate time; filtering and washing the reaction products of b) with a rising solvent to isolate the solid and liquid phases; and d) collecting and drying the solid phase to obtain α-calcium sulfate hemihydrate with high purity; wherein the relationship between the range of the concentration of calcium chloride (y) and the range of the reaction temperature (x) is shown as the following formula: | 04-08-2010 |
| 20100111821 | GYPSUM STABILISATION METHOD - The invention relates to a method for reducing or eliminating the soluble content of pollutants in gypsum or in compounds containing gypsum, wherein the gypsum or gypsum-containing compound is mixed with additives that contain or can generate aluminium oxide. More specifically, the gypsum originates from gas desulphurisation and the pollutant is fluorine. | 05-06-2010 |
| 20100166640 | METHOD FOR THE PRODUCTION OF ALPHA-CALCIUM SULFATE HEMIHYDRATE FROM CALCIUM SULFATE DIHYDRATE - Disclosed is a method for producing alpha-calcium sulfate hemihydrate from calcium dihydrate. Said method has the following features: a) calcium dihydrate is fed to an agitated autoclave ( | 07-01-2010 |
| 20110044883 | METHOD OF PURIFYING GYPSUM - A method of purifying flue gas desulfurization (FGD) gypsum. The method includes the steps of a) providing an aqueous slurry containing said FGD gypsum, b) passing the aqueous slurry to a magnetic separator, and c) contacting the FGD gypsum to be purified with a solution containing an acid and having pH below 5 in an acid washing step. Also, a purified FGD gypsum obtained by the inventive method and the use thereof as coating or filler pigment for paper or board. | 02-24-2011 |
| 20110150750 | CALCINATION METHOD AND SYSTEM - A method for the calcination of powdery or fine-particled plaster includes steps in which the plaster is subjected to a flash-calcination in a calcinator and then post-calcinated in a reaction vessel. The post-calcination is carried out in the reaction vessel by adding humid gas, the reaction vessel not being heated. This post-calcination takes place over a long period of time, that is at least 10 times, preferably 50-100 times longer than, the amount of time taken for flash calcination. Complete calcination can take place without expending additional energy, and the remaining dihydrate produced during the flash calcination is also transformed into semi-hydrate and undesired anhydrite fractions are reduced. The method ensures consistency in the product quality and also increases product quality. The temperature in the upstream calcinator can be lowered to save energy. The method can also be used to accelerate the ageing of calcined plaster. | 06-23-2011 |
| 20110165059 | PRODUCTION OF ZINC SULPHATE CONCENTRATES FROM A DILUTE ZINC SULPHATE SOLUTION - In an embodiment, the present invention relates to an apparatus and a process for producing a concentrated form of basic zinc sulphate from a, typically dilute, acidic zinc sulphate-bearing solution. The process embodiment comprises the steps of precipitating the zinc, preferably primarily as basic zinc sulphate, from the acidic zinc sulphate solution, preferably using calcium oxide, in such a way as to promote the formation of separate gypsum crystals and basic zinc sulphate particles, and upgrading the zinc content in the precipitates by separating the basic zinc sulphate from the gypsum using size separation techniques. | 07-07-2011 |
| 20130022533 | METHOD OF MANUFACTURING GYPSUM FOR THE PRODUCTION OF A GYPSUM MOLDED PRODUCT FROM GYPSUM BOARD WASTE - A method of manufacturing hemihydrate gypsum powders for the production of a gypsum molded product from gypsum board waste, comprising at least the following two steps in a random order:
| 01-24-2013 |
| 20140377162 | Method of Forming a Gypsum Based Product - A method of forming a gypsum based product is disclosed. The method comprises the steps of: calcining a mixture of water and gypsum under conditions of raised temperature and pressure within a vessel to produce an alpha-hemihydrate slurry therein; passing the alpha-hemihydrate slurry from the vessel to a mixer for mixing with additional water to produce a settable slurry, which is arranged to set to form the gypsum based product. | 12-25-2014 |
| 20160122197 | MICROWAVE HEATING FOR GYPSUM MANUFACTURING PROCESSES - Methods of making calcium sulfate whiskers are provided. In one aspect, a method includes autoclaving a slurry of calcium sulfate hemihydrate and water to form calcium sulfate hemihydrate whiskers in water and microwaving the whiskers to dewater them, wherein the microwaving is effective to prevent a majority of the whiskers from reverting to a dihydrate form. In one aspect, a method includes microwaving calcium sulfate hemihydrate whiskers to form anhydrite calcium sulfate whiskers, wherein the microwaving is effective to remove a substantial amount of chemically bound water from the whiskers. | 05-05-2016 |
| 423557000 | Copper containing | 1 |
| 20110033369 | High Purity Copper Sulfate and Method for Production Thereof - High purity copper sulfate having a purity of 99.99% or higher and in which the content of transition metals such as Fe, Cr, Ni is 3 wtppm or less is provided. A method for producing such high purity copper sulfate includes the steps of dissolving copper sulfate crystals in purified water, performing evaporative concentration thereto, removing the crystals precipitated initially, performing further evaporative concentration to effect crystallization, and subjecting this to filtration to obtain high purity copper sulfate. This manufacturing method of high purity copper sulfate allows the efficient removal of impurities from commercially available copper sulfate crystals at a low cost through dissolution with purified water and thermal concentration. | 02-10-2011 |
