| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 562480000 | Polycarboxylic acids or salts thereof | 51 |
| 20080287705 | METHOD OF PRODUCING ETHYNYL COMPOUND, METHOD OF HANDLING ETHYNYL COMPOUND, AND METHOD OF USING ASCORBIC ACID OR SALT THEREOF - A method of producing a first ethynyl compound represented by the following formula (1), the method including reacting a second ethynyl compound represented by the following formula (2) in a liquid phase in the presence of a reducing agent to obtain the first ethynyl compound, wherein Q | 11-20-2008 |
| 20090069594 | Process and Catalyst for Oxidizing Aromatic Compounds - Catalytic compositions for conversion of substituted aromatic feed materials to oxidized products comprising aromatic carboxylic acid derivatives of the substituted aromatic feed materials comprise at least two metal or metalloid elements, at least one of which is palladium, platinum, vanadium or titanium, and at least one of which is a Group 5, 6, 14 or 15 metal or metalloid. A process for oxidizing substituted aromatic feed materials comprises contacting the feed material with oxygen in the presence of such a catalytic composition in a liquid reaction mixture. | 03-12-2009 |
| 20090124829 | Terephthalic Acid Composition and Process for the Production Thereof - Terephthalic acid is prepared by reacting a 2,5-furandicarboxylate with ethylene in the presence of a solvent to produce a bicyclic ether; and then dehydrating the bicyclic ether. The process of the present invention effectively produces terephthalic acid, while reducing or eliminating the impurities, color bodies and carbon oxides produced in commercial practice by the liquid-phase oxidation of methyl-substituted benzene feedstocks. | 05-14-2009 |
| 20100076220 | NOVEL METAL ORGANIC FRAMEWORKS BASED ON ALUMINUM, IRON AND CHROMIUM - The present invention relates to a porous metal organic framework comprising a bidentate organic compound coordinated to a metal ion selected from the group of metals consisting of Al, Fe and Cr, with the bidentate organic compound being derived from a dicarboxylic acid, wherein the framework has a structure whose projection along has a pattern in which each side of a hexagon is bounded by a triangle. The present invention further relates to shaped bodies and a process for preparing the porous metal organic framework and its use. | 03-25-2010 |
| 20100160678 | PROCESS FOR THE SYNTHESIS OF 2,6-DIAMINO-3,5-DINITROTOLUENE - An improved process is provided for the preparation of 2,6-diamino-3,5-dinitrotoluene by amination of 2,6-dichloro-3,5-dinitrotoluene. The presence of water unexpectedly results in a highly pure product, free of glycol ether impurities. This product can be used to make highly pure 2,3,5,6-tetraaminotoluene, which in turn can be used to make high molecular weight polybenzimidazoles for high strength fibers. | 06-24-2010 |
| 20110065952 | ARRANGEMENT AND METHOD FOR PRODUCING HIGH-PURITY CRYSTALS - An arrangement and a method for producing high-purity crystals, such as temperature-sensitive pharmaceutical agents, in a countercurrent crystallization process. The arrangement comprises a plurality of crystallizers, mother liquor lines, each of which has a shut-off valve, and crystallization product lines, each of which has a shut-off valve, so that a mother liquor flow can be generated which is directed from a crystallizer to the second-next crystallizer in the direction of decreasing purity, and a crystallization product flow can be generated which is directed from a to dissolved crystallization product that is about to crystallize to the next crystallizer in the direction of higher purity. | 03-17-2011 |
| 20110124911 | SEMI-SYNTHETIC TEREPHTHALIC ACID VIA MICROORGANISMS THAT PRODUCE MUCONIC ACID - The invention provides a non-naturally occurring microbial organism having a muconate pathway having at least one exogenous nucleic acid encoding a muconate pathway enzyme expressed in a sufficient amount to produce muconate. The muconate pathway including an enzyme selected from the group consisting of a beta-ketothiolase, a beta-ketoadipyl-CoA hydrolase, a beta-ketoadipyl-CoA transferase, a beta-ketoadipyl-CoA ligase, a 2-fumarylacetate reductase, a 2-fumarylacetate dehydrogenase, a trans-3-hydroxy-4-hexendioate dehydratase, a 2-fumarylacetate aminotransferase, a 2-fumarylacetate aminating oxidoreductase, a trans-3-amino-4-hexenoate deaminase, a beta-ketoadipate enol-lactone hydrolase, a muconolactone isomerase, a muconate cycloisomerase, a beta-ketoadipyl-CoA dehydrogenase, a 3-hydroxyadipyl-CoA dehydratase, a 2,3-dehydroadipyl-CoA transferase, a 2,3-dehydroadipyl-CoA hydrolase, a 2,3-dehydroadipyl-CoA ligase, a muconate reductase, a 2-maleylacetate reductase, a 2-maleylacetate dehydrogenase, a cis-3-hydroxy-4-hexendioate dehydratase, a 2-maleylacetate aminoatransferase, a 2-maleylacetate aminating oxidoreductase, a cis-3-amino-4-hexendioate deaminase, and a muconate cis/trans isomerase. Other muconate pathway enzymes also are provided. Additionally provided are methods of producing muconate. | 05-26-2011 |
| 20110190538 | Oxidation System with Sidedraw Secondary Reactor - Disclosed are process and apparatus for vertical splitting of the oxygen supply to a post-oxidation reactor. Further disclosed are process and apparatus for supplying reaction medium to a post-oxidation reactor at a mid-level inlet. Such apparatus and process can assist in reducing oxygen pinch throughout the post-oxidation reactor. | 08-04-2011 |
| 20110218358 | DRYING AGENT AND METHOD FOR FORMING THE SAME - One embodiment of the present invention discloses a drying agent having the formula: [Mg | 09-08-2011 |
| 20120004454 | MIXTURES USED IN OXIDIZING ALKYL AROMATIC COMPOUNDS - A process and a mixture for oxidizing an alkyl-aromatic compound comprises forming a mixture comprising the alkyl-aromatic compound, a solvent, a bromine source, and a catalyst; and contacting the mixture with an oxidizing agent at oxidizing conditions to produce an oxidation product comprising at least one of an aromatic aldehyde, an aromatic alcohol, an aromatic ketone, and an aromatic carboxylic acid. The solvent comprises a carboxylic acid having from 1 to 7 carbon atoms and an ionic liquid selected from the group consisting of an imidazolium ionic liquid, a pyridinium ionic liquid, a phosphonium ionic liquid, a tetra alkyl ammonium ionic liquid, and combinations thereof. The catalyst comprises at least one of cobalt, titanium, manganese, chromium, copper, nickel, vanadium, iron, molybdenum, tin, cerium, and zirconium. | 01-05-2012 |
| 20120004455 | SOLID TEREPHTHALIC ACID COMPOSITION - A solid terephthalic acid composition and a process for producing terephthalic acid from para-xylene. The process comprises forming a mixture comprising the para-xylene, a solvent, a bromine source, and a catalyst; and oxidizing the para-xylene by contacting the mixture with an oxidizing agent at oxidizing conditions to produce a solid oxidation product comprising terephthalic acid, para-toluic acid, 4-carboxybenzaldehyde. The solvent comprises a carboxylic acid having from 1 to 7 carbon atoms and an dialkyl imidazolium ionic liquid; and the catalyst comprises at least one of cobalt, titanium, manganese, chromium, copper, nickel, vanadium, iron, molybdenum, tin, cerium, and zirconium. The solid terephthalic acid composition comprises, less than about 4,000 ppm-wt 4-carboxybenzaldehyde content, and more than about 2,000 ppm-wt a para-toluic acid. | 01-05-2012 |
| 20120323039 | CARBOXYLIC ACID PRODUCTION PROCESS EMPLOYING SOLVENT FROM ESTERIFICATION OF LIGNOCELLULOSIC MATERIAL - Methods and apparatus for producing a carboxylic acid employing a solvent from esterification of lignocellulosic materials. An acid-containing composition from esterification of lignocellulosic materials can be employed in the oxidation of para-xylene to terephthalic acid. The acid-containing composition can comprise acetic acid, acetic anhydride, and one or more terpenes or terpenes derivatives. | 12-20-2012 |
| 20130066106 | DRYING AGENT - One embodiment of the present invention discloses a drying agent having the formula: [Mg | 03-14-2013 |
| 20130144084 | METHOD FOR PREPARING CARBOXYLIC ACIDS - The present invention relates to a method for preparing carboxylic acids comprising the step of contacting an aromatic hydrocarbon comprising at least one group including an α C-atom that is oxidizable to a carboxylic group in liquid phase with an oxygen containing gas in the presence of a heterogeneous catalyst with perovskite structure ABO | 06-06-2013 |
| 20130165687 | NOVEL METAL ORGANIC FRAMEWORKS BASED ON ALUMINUM, IRON AND CHROMIUM - The present invention relates to a porous metal organic framework comprising a bidentate organic compound coordinated to a metal ion selected from the group of metals consisting of Al, Fe and Cr, with the bidentate organic compound being derived from a dicarboxylic acid, wherein the framework has a structure whose projection along [001] has a pattern in which each side of a hexagon is bounded by a triangle. The present invention further relates to shaped bodies and a process for preparing the porous metal organic framework and its use. | 06-27-2013 |
| 20130172613 | PROCESS FOR OXIDIZING ALKYL-AROMATIC COMPOUNDS - A process for oxidizing an alkyl-aromatic compound is described. The process includes contacting the alkyl-aromatic compound, a solvent comprising a precursor of at least one ionic liquid, a bromine source, a catalyst, and an oxidizing agent to produce an oxidation product comprising at least one of an aromatic alcohol, an aromatic aldehyde, an aromatic ketone, and an aromatic carboxylic acid. | 07-04-2013 |
| 20150361028 | PROCESS FOR PREPARING A DIAMINE/DICARBOXYLIC ACID SALT - The present invention also relates to a process for preparing a diamine/dicarboxylic acid salt wherein the dicarboxylic acid comprises an aromatic dicarboxylic acid and is provided in a powder form; the diamine is provided in a liquid form gradually dosed to the dicarboxylic acid powder, while keeping the dicarboxylic acid powder in constant movement; the processing temperature is above 0° C. and below the boiling temperature of the diamine and the melting temperature of the acid and the salt, and the reaction mixture comprises at most 5 wt. % of water. The present invention also relates to an anhydrous diamine/dicarboxylic acid salt obtainable by the process according to invention, or any embodiment thereof as described above. | 12-17-2015 |
| 20160137579 | PROCESS FOR THE PREPARATION OF BENZENE DERIVATIVES FROM FURAN DERIVATIVES - Benzene derivatives of the formula (I); | 05-19-2016 |
| 562483000 | Preparation by hydrolysis of amide, anhydride, or ester | 2 |
| 20090099388 | RECOVERY OF AROMATIC DICARBOXYLIC ACIDS FROM WASTE POLYESTER RESIN IN THE PRESENCE OF A POLYAMIDE - The present invention relates to a process of recovering aromatic dicarboxylic acids with low metal contaminants from manufactured articles, such as beverage bottles, fibers and films, comprising aromatic polyesters, whether or not those articles are contaminated with PVC or chlorinated compounds, or from waste from processing of these polyesters. In particular, the invention relates to the recovery of terephthalic acid, isophthalic acid and 2,6-naphthalene dicarboxylic acid from bottles for recycling which are made of PET, PEN or aromatic polyester copolymers. | 04-16-2009 |
| 20110172461 | Polymer Recycling Methods Employing Catalytic Transfer Hydrogenation and Base Cleavage Reactions - Methods of recycling a post-consumer polymer material comprise depolymerizing the polymer material by heating the polymer material in the presence of a hydrogen donor material and a strong base compound, and optionally a catalyst, to effect catalytic transfer hydrogenation and base cleavage and produce intermediate and/or monomer products of molecular weights lower than that of the polymeric material. In a specific embodiment, the methods comprise recycling post-consumer polyethylene terephthalate. The methods comprise depolymerizing the polyethylene terephthalate by heating in the presence of a hydrogen donor material and a strong base compound, and optionally a catalyst, to effect catalytic transfer hydrogenation and base cleavage and produce terephthalic and/or naphthalic acid, or a salt thereof, and ethylene glycol. | 07-14-2011 |
| 562485000 | Purification or recovery per se | 24 |
| 20090287017 | RECOVERY OF AROMATIC DICARBOXLYIC ACIDS FROM WASTE POLYESTER RESIN - The present invention relates to a process of recovering aromatic dicarboxylic acids with low metal contaminants from manufactured articles and/or articles contaminated with PVC or chlorinated compounds, made of or containing aromatic polyester resins, such as beverage bottles, fibers and films, or from waste from processing of these resins. In particular, the invention relates to the recovery of terephthalic acid, isophthalic acid and 2,6-naphthalene dicarboxylic acid from bottles for recycling which are made of PET, PEN or aromatic polyester copolymers. | 11-19-2009 |
| 20100029982 | Production of functionally effective organic molecules from lignite cleavage - A novel functionally effective organic molecules with various molecular weights are produced by cleaving lignite with hydrogen peroxide or alkaline hydrogen peroxide predominantly below 1000 molecular weight, the said functionally effective organic molecules, molecular weights varies depending on the reaction conditions such as concentration of hydrogen peroxide, time of reaction, temperature, ratio of lignite to hydrogen peroxide, lignite quality etc. conditions. These organic molecules are functionally effective than normal organic molecules (humic, fulvic acids etc.) present naturally in lignite or leonardite due to enhanced reactive nature obtained by treating with hydrogen peroxide or alkaline hydrogen peroxide which are resultant of cleavage of lignite. These functionally effective organic molecules have utilities in various areas such as agriculture and medicine. | 02-04-2010 |
| 20100160679 | INTEGRATED PROCESS FOR THE PREPARATION OF POLYBENZIMIDAZOLE PRECURSORS - Processes are provided for preparing complexes of 2,3,5,6-tetraaminotoluene with an aromatic diacid where the aromatic diacid is insoluble in water under ambient conditions. An integrated process design starting with nitration of 2,6-dihalotoluene eliminates costly intermediate drying and recrystallization steps. Handling of solid materials with possible skin sensitizing properties and toxicity is avoided, thereby eliminating human and environmental exposure. | 06-24-2010 |
| 20110269991 | PURE CARBOXYLIC ACID FILTRATION - The present invention relates to a process for production of pure terephthalic acid comprising: a) removing a mother liquor from a terephthalic acid through a filter with a gas, wherein the gas comprises steam at a concentration of least about 50% by volume; b) purifying the gas; and c) recycling the gas purified in step (b) back to step (a). | 11-03-2011 |
| 20120004456 | PROCESS FOR PURIFYING TEREPHTHALIC ACID - A process for purifying crude terephthalic acid comprising a contaminant at a first concentration, the process comprising contacting the crude terephthalic acid with a solvent comprising an ionic liquid at purifying conditions to produce a solid terephthalic acid product having a second concentration of the contaminant lower than the first concentration. | 01-05-2012 |
| 20120142962 | METHODS, PROCESSES, AND SYSTEMS FOR TREATING AND PURIFYING CRUDE TEREPHTHALIC ACID AND ASSOCIATED PROCESS STREAMS - Embodiments of the present disclosure include methods or processes for purifying CTA, systems for purifying CTA, methods or processes for cooling mother liquor streams, systems for cooling mother liquor streams, methods or processes for treating mother liquor solids, systems for treating mother liquor solids, and the like. | 06-07-2012 |
| 20130079551 | RECOVERY OF AROMATIC CARBOXYLIC ACIDS AND OXIDATION CATALYST - The present invention relates to a process for recovery of catalyst, aromatic polycarboxylic acids and aromatic monocarboxylic acids from a residue stream from manufacture of an aromatic polycarboxylic acid. | 03-28-2013 |
| 20130190530 | Process And System For The Separation Of Carboxylic Acids From A Slurry - In a process for the separation of carboxylic acid from a slurry in a solvent, a slurry with crystals of carboxylic acid is supplied to a filter operating at pressure and at a temperature above the atmospheric boiling point of the solvent. Inert gas is mixed with the solvent and the mixture is supplied to the filter. A cake of separated crystals is removed from the filter. Inert gas removed from the filter is not recycled. In a system for performing such separation, a pressure filter device has a slurry inlet, and an outlet. Means for mixing inert gas and solvent, and means for supplying the mixture to the pressure filter are provided. The pressure filter device is configured to operate at pressure and at a temperature above the atmospheric boiling point of the solvent. The system does not include means for recycling inert gas removed from the filter. | 07-25-2013 |
| 20130211134 | Process And System For The Separation of Solid Carboxylic Acid Fines - In a process for the separation of solid carboxylic acid fines from mother liquor that includes such fines, the mother liquor is fed to a settlement drum at above atmospheric pressure. The mother liquor having a lower concentration of carboxylic fines than that fed to the settlement drum is then removed, wherein the mother liquor removal occurs at a point above the point at which the mother liquor containing fines is fed to the settlement drum. In a system for performing the separation process, a settlement drum has an inlet for mother liquor with carboxylic acid fines and an outlet for mother liquor having a lower concentration of carboxylic acid fines content than that of the mother liquor introduced via the inlet. The settlement drum is configured to operate at above atmospheric pressure and the outlet is located at a point in the settlement drum above the inlet. | 08-15-2013 |
| 20130245317 | Process and System For The Separation And Drying of Carboxylic Acid Crystals - In a process for the separation and drying of crude carboxylic acid crystals from a slurry in a solvent, the slurry is supplied to a filter operating at pressure and at a temperature above the atmospheric boiling point of the solvent. A cake of separated crystals is removed from the filter and passed to a thermal dryer. In a system for the separation and drying of crude carboxylic acid from a slurry in a solvent, a pressure filter device has a slurry inlet and an outlet for a cake of carboxylic acid crystals. The system also has a thermal dryer and means for transporting the cake of carboxylic acid crystals from the pressure filter device to the dryer. The pressure filter device is configured to operate at a pressure and temperature above the atmospheric boiling point of the solvent. | 09-19-2013 |
| 20130281732 | CROSSFLOW TYPE FILTERING OPERATION METHOD USING CERAMIC FILTER - Provided is a simple filtering operation method capable of conducting a filtering operation without clogging in a ceramic filter for a long period of time, in the operation of filtering fine crystals of terephthalic acid in an oxidation reaction mother liquor obtained in a process of terephthalic acid production by a cross-flow filtration using the ceramic filter. The present invention can be accomplished by conducting an operation for filtering the fine crystals and a back washing operation with a filtrate while maintaining a flowing circulation operation of the oxidation reaction mother liquor under predetermined conditions. | 10-24-2013 |
| 20130310602 | Process And Apparatus For Slurry Separation Of Aromatic Carboxylic Acid - In a process for removing aromatic carboxylic acid from a slurry thereof in solvent, the slurry is split into sub streams and each of said sub streams is supplied to a respective rotary pressure filter such that the sub stream pass through the filters in parallel. Gas is passed through the rotary pressure filters in series in an open-loop arrangement. | 11-21-2013 |
| 20130331603 | Process for Purifying Terephthalic Acid Using Ionic Liquids - Methods of purifying crude or contaminated terephthalic acid using ionic liquids are described. Crude or contaminated terephthalic acid is contacted with a solvent in the absence of an oxidizing agent to form a purified product having at least 30 wt % less 4-carboxybenzaldehyde compared to the crude or contaminated terephthalic acid. The solvent consists essentially of an ionic liquid, optionally an ionic solid or a material capable of forming an ionic salt, and optionally an aqueous solvent. The ionic liquid is formed in situ from at least one ionic liquid precursor. | 12-12-2013 |
| 20140107375 | PROCESS FOR OXIDIZING IMPURITIES IN CRUDE TEREPHTHALIC ACID - A process for oxidizing solid crude terephthalic acid is described. The process includes contacting solid crude terephthalic acid with a solvent comprising a carboxylic acid and one or more of an ionic liquid or ammonium acetate; a bromine source; a catalyst; and an oxidizing agent to produce solid purified terephthalic acid at a temperature of about 100 to about 210° C., and a pressure of about 2 to about 4.5 MPa, for a time of about 5 to about 60 min, and recovering the solid purified terephthalic acid. | 04-17-2014 |
| 20150315116 | PURE PLANT MOTHER LIQUOR SOLVENT EXTRACTION SYSTEM AND METHOD - The invention relates to a process for producing terephthalic acid and for purifying the mother liquor resulting from said process. Useful compounds can be extracted from the mother liquor and the purified mother liquor can be returned for use in the process. Advantageously, certain parameters of the mother liquor purification method are selected such that the purification provides an economic benefit as compared with other purification methods. | 11-05-2015 |
| 562486000 | By crystallization | 8 |
| 20080275271 | Process for Preparing Purified Terephthalic Acid - The present invention relates to a process for preparing purified terephthalic acid [PTA,], comprising the steps: dissolving crude terephthalic acid [CTA] in an aqueous medium in a reactor; hydrogenating CTA at a temperature of about 260-320° C. and a pressure of about 1100-1300 psig using a hydrogenation catalyst; crystallizing terephthalic acid in the reactor by lowering the temperature of the solution to about 160° C. without evaporation cooling; transferring the content of the reactor to a filtration unit; filtrating the content at a temperature of about 140-160° C. and a pressure of about 40-100 psig, preferably 80-100 psig to obtain a filter cake, washing the filter cake obtained with water having a temperature of about 140-160° C. in the filtration unit; and drying the filter cake. | 11-06-2008 |
| 20090182169 | METHOD OF CRYSTALLIZATION - The present invention relates to a multi-stage crystallization process which comprises the steps of feeding a solution of terephthalic acid or a slurry (raw slurry) containing terephthalic acid partially precipitated to a first crystallization vessel to precipitate the terephthalic acid therein; and feeding a slurry (crystallization slurry) containing the thus precipitated terephthalic acid sequentially to second and subsequent crystallization vessels, wherein while continuously supplying a cleaning solvent to a delivery conduit connecting the former-stage crystallization vessel and the next latter-stage crystallization vessel to each other, the crystallization slurry is fed through the delivery conduit. There is provided a multi-stage crystallization process using a solution of terephthalic acid or a slurry containing terephthalic acid partially precipitated as a raw material in which even when the process is operated for a period as long as several months, the delivery conduit is free from occurrence of clogging. | 07-16-2009 |
| 20100004484 | METHOD OF REPLACING DISPERSION MEDIUM - A method of replacing a first dispersion medium in a starting slurry composed of the first dispersion medium and isophthalic acid crystals with a second dispersion medium. The starting slurry is tangentially fed to a vertically extending cylindrical portion of a cyclone-shaped nozzle disposed at an upper portion of a replacement tank of a dispersion medium replacement apparatus, from a tangential direction of the cylindrical portion. The fed starting slurry moves circularly along an inner wall of the cylindrical portion. The slurry circularly moving is then discharged from an opening which is disposed at a vertically lower end of the cylindrical portion and dispersed in a second dispersion medium which is fed from a lower portion of the replacement tank. The replaced slurry composed of isophthalic acid crystals and the second dispersion medium is mainly discharged from the lower portion of the replacement tank, and the first dispersion medium is mainly withdrawn from the upper portion of the replacement tank. | 01-07-2010 |
| 20100036155 | METHOD AND APPARATUS FOR THE PURIFICATION OF HIGH-PURITY 2,6-NAPHTHALENE DICARBOXYLIC ACID - Disclosed is a method for purifying 2,6-naphthalenedicarboxylic acid (NDA) that is present in a solid state in a solution. According to the method, sintered metal membrane filtration units are used to efficiently separate and purify 2,6-naphthalenedicarboxylic acid separated after hydrogenation and crystallization in a continuous process. An apparatus for implementing the method is further provided. | 02-11-2010 |
| 20100174111 | PROCESS FOR PURIFICATION OF ARYL CARBOXYLIC ACIDS - Disclosed herein is a process for purifying aryl carboxylic acids, in particular terephthalic acid, wherein the impure acid is dissolved or dispersed in an ionic liquid and a non-solvent is added to precipitate the purified acid. The present disclosure further relates to compositions comprising terephthalic acid and one or more ionic liquids. | 07-08-2010 |
| 20140200364 | METHOD FOR PRODUCING A PURIFIED NAPHTHALENE DICARBOXYLIC ACID - A method for producing a purified naphthalenedicarboxylic acid includes steps of mixing a naphthalenedicarboxylic acid-containing material and an amine in a mixed liquid of water and an organic solvent to give a crystal of a naphthalenedicarboxylic acid amine salt; and obtaining a purified naphthalenedicarboxylic acid from the crystal of the naphthalenedicarboxylic acid amine salt, wherein (1) in the step of forming the naphthalenedicarboxylic acid amine salt by adding an amine to the slurry that contains water, an organic solvent and a naphthalenedicarboxylic acid, the amine addition rate is from 0.002 to 0.4 mol/min relative to one mol of the naphthalenedicarboxylic acid, or (2) an amine is added to the aqueous solution prepared by dissolving the naphthalenedicarboxylic acid amine salt in water, or to the liquid prepared through solid-liquid separation of the aqueous solution to insolubilize and precipitate the metal component, and the precipitated metal component is removed through solid-liquid separation. | 07-17-2014 |
| 20150038737 | Process And System For Purification Of Aromatic Dicarboxylic Acid - In a process/system for the purification of aromatic dicarboxylic acid (ACA), crude ACA solids are slurried with water recycled from at least a filtration step in a feed preparation zone. Flash steam in vapour phase is supplied to the zone from at least one of a crystallisation step, a filtration step, and a drier step. The slurried ACA solids are preheated to form a solution that is then hydrogenated. The ACA is allowed to crystallise and then crystals of pure ACA are filtered out and water is recovered in a single stage filtration process. Recovered water is supplied to the feed preparation zone and the crystals are dried and recovered. The flash steam recovered from the crystallisation step, filtration step and/or drier step is recovered as a vapour phase stream having a pressure from about atmospheric to 5 barg and supplied to the feed preparation zone without phase change. | 02-05-2015 |
| 20150065748 | PROCESS FOR SEPARATING ARYL CARBOXYLIC ACIDS - In the present disclosure, a process for separating aryl carboxylic acids from a mixture comprising a plurality of aryl carboxylic acids is provided, wherein the process comprising the steps of heating a first mixture that comprises at least two aryl carboxylic acids wherein each of said aryl carboxylic acids having a pre-determined liquefaction temperature and a pre-determined precipitation temperature, with at least one ionic compound, at a pre-determined temperature to obtain a liquefied composition; and cooling the liquefied composition under controlled temperature conditions to fractionally crystallize and precipitate an aryl carboxylic acid. The precipitated aryl carboxylic acid is isolated and the obtained mother liquor is subjected to iterated cooling steps until each of the remaining aryl carboxylic acids precipitates one by one. The mother liquor remains in liquefied form. | 03-05-2015 |
| 562487000 | By reaction of undesired component | 1 |
| 20160200658 | PROCESS FOR RECOVERING WATER, METAL AND ORGANICS FROM THE PRODUCTION OF POLYCARBOXYLIC ACID | 07-14-2016 |
| 562488000 | Plural rings | 7 |
| 20090048462 | Method for producing biphenyltetracarboxylic acid - A method for producing a biphenyltetracarboxylic acid is to perform dimerization of a bromophthalate under the presence of a palladium catalyst and at least one reducing agent selected from the group consisting of saccharides and aliphatic monoalcohols having at least two carbon atoms. By this production method, since a side reaction is suppressed, a biphenyltetracarboxylic acid useful as a starting material for a polyimide resin having superior heat resistance and mechanical properties can be obtained in higher yield than ever. | 02-19-2009 |
| 20100063318 | Purification Method of Crude Naphthalene Dicarboxylic Acid Using Microorganism and 2,6-Naphthalene Dicarboxylic Acid in Crystalline Form Obtained by Using the Same - Disclosed is a method for purifying a crude naphthalene dicarboxylic acid using microorganism. According to the purification method, a crude naphthalene dicarboxylic acid is purified by reacting a microorganism having the ability to convert 2-formyl-6-naphthoic acid to 2,6-naphthalene dicarboxylic acid with a crude naphthalene dicarboxylic acid, adding an acidic solution to the reaction solution under particular conditions, stirring the mixed solution to crystallize the crude naphthalene dicarboxylic acid, washing the crystallized crude naphthalene dicarboxylic acid, and drying the washed product to obtain 2,6-naphthalene dicarboxylic acid in a pure crystalline form. Advantageously, the purification method enable production of high-purity crystalline 2,6-naphthalene dicarboxylic acid on an industrial scale in an environmentally friendly manner. | 03-11-2010 |
| 20110144386 | Graphene Compositions and Drilling Fluids Derived Therefrom - Drilling fluids comprising graphenes and nanoplatelet additives and methods for production thereof are disclosed. Graphene includes graphite oxide, graphene oxide, chemically-converted graphene, and functionalized chemically-converted graphene. Derivatized graphenes and methods for production thereof are disclosed. The derivatized graphenes are prepared from a chemically-converted graphene through derivatization with a plurality of functional groups. Derivatization can be accomplished, for example, by reaction of a chemically-converted graphene with a diazonium species. Methods for preparation of graphite oxide are also disclosed. | 06-16-2011 |
| 20130079552 | GRAPHENE OXIDE REDUCING AGENT COMPRISING A REDUCING AGENT CONTAINING A HALOGEN ELEMENT, METHOD FOR MANUFACTURING A REDUCED GRAPHENE OXIDE USING SAME, AND USE OF THE REDUCED GRAPHENE OXIDE MANUFACTURED BY THE METHOD - The present invention relates to a novel graphene oxide reducing agent and a method for manufacturing a reduced graphene oxide from graphene oxide using same. More particularly, in the present invention, the reduced graphene oxide is manufactured by reducing a graphene oxide using a reducing agent containing a halogen element, and is applicable as an electric conductor, a semiconductor, and an insulator in various fields. | 03-28-2013 |
| 20130137894 | CHEMICALLY-MODIFIED GRAPHENE AND METHOD FOR PRODUCING THE SAME - A chemically-modified graphene includes a graphene layer and a plurality of functional groups that are grafted to the graphene layer and each of which is represented by —CO—R—COOH, wherein R is an optionally substituted C | 05-30-2013 |
| 20150126773 | USE OF SOLUTIONS OF SYNTHETIC ALKYLATED GRAPHENES SOLUTIONS FOR MULTIPHASE FLOW TEST FLUIDS TO BE USED BY THE OIL AND GAS INDUSTRY - Synthetic alkylated graphenes of well chosen structure are prepared and used for mimicking indigenous asphaltenes. The mixtures can be used as multiphase flow test fluids in general and specifically in the Oil and gas industry. | 05-07-2015 |
| 20150344399 | Heat as a Method to Enhance the Fluid Activating Ability of Humic Acids, Zeolites and related Enerceuticals - The invention relates to the use of heat and/or acids to increase the water activating property of various substances, including humic acids and zeolites. The basic theme is that, whenever possible, water being consumed by humans and animals, or being used in agriculture, should be pre-activated using one or other of the available methods. Humic acids and zeolites have been shown to have water-activating activities. Pre-heating these materials to temperatures in the range of 1,000° C., significantly increases this water-activating activity. Lesser increases in water activation are achievable using 200° C. heat and/or exposure to low pH using acids. Other fluids, including alcoholic beverages, can similarly be more efficiently activated using heated versus unheated humic acids and/or zeolites. This discovery will help facilitate the utilization of activated water in various fields, including human and animal consumption, agriculture and industry. | 12-03-2015 |
