Patent application number | Description | Published |
20080207955 | Method for the Production of Polyoxymethylene Dialkyl Ethers from Trioxan and Dialkylethers - A process for preparing polyoxymethylene dialkyl ethers of the formula | 08-28-2008 |
20080216390 | Biodiesel Fuel Mixture Containing Polyoxymethylene Dialkyl Ether - A biodiesel fuel mixture having a cetane number of >40, comprising
| 09-11-2008 |
20080295688 | Process for Extracting (Chlorinated) Hydrocarbon-Free Hydrogen Chloride and Phosgene-Free (Chlorinated) Hydrocarbons from a Hydrogen Chloride Stream Containing (Chlorinated) Hydrocarbons and Phosgene - Process for recovering (chloro)hydrocarbon-free hydrogen chloride and phosgene-free (chloro)hydrocarbons from a hydrogen chloride stream comprising (chloro)hydrocarbons and phosgene, which comprises
| 12-04-2008 |
20090304572 | METHOD FOR THE PRODUCTION OF CHLORINE - Process for preparing chlorine from hydrogen chloride, which comprises the steps:
| 12-10-2009 |
20110028761 | PROCESS FOR THE PREPARATION OF TRIAMIDES FROM AMMONIA AND AMIDODICHLORIDES - The invention relates to a process for the preparation of triamides from ammonia and amido-dichlorides. | 02-03-2011 |
20110218357 | PROCESSES FOR PREPARING 4-CHLOROBENZENESULFONIC ACID AND 4,4'-DICHLORODIPHENYL SULFONE - The invention relates to a process for preparing 4-chlorobenzenesulfonic acid from 2-chlorobenzenesulfonic acid and/or 3-chlorobenzenesulfonic acid, comprising the conversion of 2-chlorobenzenesulfonic acid and/or 3-chlorobenzenesulfonic acid to 4-chlorobenzenesulfonic acid in the presence of sulfuric acid at a temperature of 100 to 300° C. | 09-08-2011 |
20110263892 | PROCESS FOR PREPARING AN ISOCYANATE - The present invention relates to a process for preparing an isocyanate, comprising hydrogenating a mixture (Gi) comprising an amine in the presence of a hydrogenation catalyst comprising copper to obtain a mixture (Gii) comprising the amine, and reacting the mixture (Gii) with phosgene to obtain a mixture (Giii) comprising the isocyanate. The present invention further relates to the isocyanate preparable by this process. | 10-27-2011 |
20110263902 | PROCESS FOR PREPARING 4,4'-DICHLORODIPHENYL SULFONE - The invention relates to a process for preparing 4,4′-dichlorodiphenyl sulfone, comprising the reaction of monochlorobenzene and liquid sulfur trioxide, wherein the liquid sulfur trioxide used has a boron content of at most 100 ppm based on the total weight of the sulfur trioxide used, including all secondary components. | 10-27-2011 |
20110263903 | PROCESS FOR PREPARING 4,4'-DICHLORODIPHENYL SULFONE - The invention relates to a process for preparing 4,4′-dichlorodiphenyl sulfone proceeding from monochlorobenzene, wherein the content in the monochlorobenzene used of hydrocarbons having from 5 to 8 carbon atoms is at most 100 ppm; based on the total weight of the monochlorobenzene used, including the secondary components. | 10-27-2011 |
20110319662 | METHOD FOR PRODUCING PHOSGENE - A process for preparing phosgene by reaction of a feed stream ( | 12-29-2011 |
20120046497 | METHOD FOR PRODUCING COLOR-STABLE MDA AND MDI - The invention relates to a process for preparing methylenediphenyldiamine (MDA) by reacting formaldehyde and aniline in the presence of an acidic catalyst, wherein the oxygen content in the process for preparing MDA is <10 000 ppm, based on all compounds present in the process. | 02-23-2012 |
20120101299 | PROCESS FOR THE PRODUCTION OF ISOCYANATES, PREFERABLY DIISOCYANATES AND POLYISOCYANATES WITH SOLVENT RECIRCULATION - The present invention relates to a process for the production of isocyanates, preferably diisocyanates and polyisocyanates of the diphenylmethane series (MDI), by reacting an amine with phosgene in the liquid phase or in the gas phase to form the corresponding isocyanates, subsequent removal of the solvent in at least two steps to obtain at least two solvent streams, individual treatment of the at least two solvent streams, and re-circulation of at least a portion of the solvent streams. | 04-26-2012 |
20120108843 | PROCESS FOR THE PREPARATION OF LIGHT-COLORED IOCYANATES OF A DIPHENYLMETHANEDIISOCYANATE SERIES - The present invention accordingly provides a process for preparing light-coloured polyphenylene-polymethylene polyisocyanates comprising the steps (a) providing an amount of chlorine, (b) separating the chlorine provided in the step (a) to obtain a first chlorine fraction having a content of free and bound bromine and iodine of <50 ppm and a second chlorine fraction having an increased content of free and bound bromine and iodine that depends on the original amount of bromine and iodine in the chlorine provided in step (a) and the separation split, (c) reacting carbon monoxide with at least a portion of the first chlorine fraction to form a first phosgene fraction, (d) reacting carbon monoxide with at least a part of the second chlorine fraction to form a second phosgene fraction, (e) reacting at least a portion of a first phosgene fraction with at least one amine of the diphenylmethane diamine series (MDA) to form the corresponding polyphenylene-polymethylene polyisocyanate (PMDI), and (f) reacting at least a portion of the second phosgene fraction with at least one primary amine with the exception of mono- and polyphenylene-polymethylene polyamines to form an at least one isocyanate-containing reaction solution. | 05-03-2012 |
20120108844 | METHOD OF MEASURING ENTRY OF WATER INTO PHOSGENE-CONDUCTING PLANTS - The invention relates to a method of measuring entry of water and resulting corrosion in plants for producing isocyanates by reacting phosgene with one or more primary amines in a solvent. The invention further relates to an apparatus for producing such isocyanates, in the work-up section of which probes for monitoring corrosion are arranged in defined places. | 05-03-2012 |
20120123151 | PROCESS FOR PREPARING METHYLENEDI(PHENYL ISOCYANATE) - The invention relates to a process for preparing methylenedi(phenyl isocyanate), which comprises (a) the phosgenation of two-ring and/or multiring methylenedi(phenylamine), (b) the fractionation of the crude methylenedi(phenyl isocyanate) obtained to give two-ring and multiring isomers, (c) the purification and/or fractionation of the resulting mixture of two-ring isomers of methylenedi(phenyl isocyanate) and (d) the storage of the mixtures obtained in step (c) or in step (b), wherein part of the stored mixtures is reused by means of recirculation in at least one of steps (b) or (c). | 05-17-2012 |
20120142959 | METHOD FOR PRODUCING DIISOCYANATES BY GAS-PHASE PHOSGENATION - A process for preparing diisocyanates by gas-phase phosgenation starting out from a feed stream comprising the corresponding diamines and a phosgene-comprising feed stream, in which the feed streams are separately converted into the gas phase and preheated to the reaction temperature of the gas-phase phosgenation, wherein the waste heat from a plant for preparing chlorine by heterogeneously catalyzed oxidation of hydrogen chloride by the Deacon process is utilized for this purpose, is proposed. | 06-07-2012 |
20120172620 | PROCESS FOR PREPARING LIGHT-COLOURED ISOCYANATES OF THE DIPHENYLMETHANE SERIES - The present invention relates to a process for preparing light-coloured polyphenylene-polymethylene-polyisocyanate (PMDI), comprising the steps (a) providing carbon monoxide and chlorine, (b) reacting carbon monoxide with chlorine to form phosgene, (c) reacting the phosgene from step (b) with at least one primary amine with the exception of mono- and polyphenylene-polymethylene polyamines with an excess of phosgene to form an at least one isocyanate containing reaction solution, and hydrogen chloride, (d) separating excess phosgene from the isocyanate-containing reaction solution obtained in step (c), (e) providing at least one polyphenylene-polymethylene polyamine, and (f) reacting at least a portion of the phosgene separated in step (d) with the at least one polyphenylene-polymethylene polyamine to form the light-coloured polyphenylene-polymethylene polyisocyanate. | 07-05-2012 |
20120213692 | DISTILLATION PROCESS FOR SEPARATING CHLORINE FROM GAS STREAMS COMPRISING OXYGEN AND CHLORINE - The invention relates to a process for separating chlorine from a gas stream I comprising oxygen and chlorine, in which the gas stream I is fed into a lower part of a column K | 08-23-2012 |
20120213693 | USE OF LIQUID HYDROGEN CHLORIDE AS REFRIGERANT IN PROCESSES FOR PREPARING CHLORINE - This invention relates to a process for preparing chlorine from HCl and a method of using liquid HCl to cool and optionally liquefy chlorine in the process. The process involves introducing at least one HCl-containing stream and an oxygen-containing stream into an oxidation zone and catalytically oxidizing the HCl to chlorine, contacting the chlorine with aqueous HCl with partial separation of water and HCl to yield a gas stream, drying the gas stream to yield an essentially water-free gas stream, which is compressed and cooled to give an at least partially liquefied stream, and separating the liquefied stream into a gas stream and a liquid stream which is separated into a chlorine stream, such that cooling and partial liquefaction of the gas stream is effected by indirect heat exchange with a liquid HCl stream, resulting in some of the liquid HCl stream vaporizing to form a gaseous HCl stream. | 08-23-2012 |
20120251435 | PROCESS FOR PREPARING ISOCYANATES - A process is proposed for preparing isocyanates by phosgenating the corresponding amines in the gas phase, which comprises
| 10-04-2012 |
20150080600 | PROCESS FOR PREPARING ISOCYANATES - The present invention relates to gas phase phosgenation of amines for preparation of isocyanates. In the present invention, phosgene is prepared by reacting chlorine with an excess of carbon monoxide in a gas phase. The obtained phosgene-containing reaction mixture is divided into two streams by a thermal and/or a membrane separating process. The first stream is a low-carbon monoxide stream of no more than 1% by weight of carbon monoxide, based on a total weight of the first stream. The second stream is a carbon monoxide-rich stream of more than 10% by weight of carbon monoxide, based on a total weight of the second stream. The first stream is used as the phosgene-containing reactant stream in the gas phase phosgenation of amines to prepare isocyanates. The second stream can be recycled into the phosgene synthesis. | 03-19-2015 |