Patent application number | Description | Published |
20080200721 | Mdi Production By Means of Liquid Phase and Gas Phase Phosgenation - The invention relates to a process for preparing isocyanates, which comprises the
| 08-21-2008 |
20080200722 | Method For Producing Diisocyanates - The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase. | 08-21-2008 |
20080207954 | Method for Producing Polyoxymethylene Dimethyl Ethers From Methanol and Formaldehyde - A process for preparing tri- and tetraoxymethylene glycol dimethyl ether (POMDME | 08-28-2008 |
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 |
20080221368 | Process for Preparing Polyoxymethylene Dimethyl Ethers from Methanol and Formaldehyde - A process for preparing tri- and tetraoxymethylene glycol dimethyl ether (POMDME | 09-11-2008 |
20080233043 | Method For the Production of Chlorine By Means of Gas Phase Oxidation of Hydrogen Chloride - A process for preparing chlorine by gas-phase oxidation of hydrogen chloride by means of a gas stream comprising molecular oxygen in the presence of a fixed-bed catalyst, wherein the process is carried out in a reactor ( | 09-25-2008 |
20080249332 | Process for the Preparation of Isocyanates - The invention provides a multistage process for continuously preparing organic, distillable polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reacting the corresponding organic polyamines with carbonic acid derivatives and alcohols to low molecular mass monomeric polyurethanes, and thermally cleaving said polyurethanes, in which at defined reaction stages the polyisocyanates prepared and unusable residues are separated off, and reusable by products and intermediates are recycled to upstream stages. | 10-09-2008 |
20080255376 | Method For the Production of Dioxolane - Processes comprising: providing a reactive distillation column having an upper region, a middle region and a lower region; feeding ethylene glycol and an aqueous formaldehyde solution into the reactive distillation column in the middle region of the reactive distillation column; reacting the ethylene glycol and the aqueous formaldehyde solution in the reactive distillation column in the presence of a catalyst to form dioxolane; removing a product stream comprising dioxolane in an amount of at least 75% by weight from the upper region of the reactive distillation column; and removing a bottom stream comprising one or more components having boiling points higher than dioxolane from the lower region of the reactive distillation column. | 10-16-2008 |
20080262263 | Method For Purifing Residues Containing Isocyanates - The present invention comprises a process for purifying isocyanate-comprising residues. | 10-23-2008 |
20080281109 | Integrated Method For the Production of Trioxane From Formaldehyde - The invention relates to an integrated process for preparing trioxane from formaldehyde in which, in a first step, a stream A | 11-13-2008 |
20080283384 | Process for Producing Trioxane and at Least One Comonomer - The invention relates to a process for preparing trioxane and at least one comonomer for preparing (co)polymers based on trioxane, in which, in a first step, formaldehyde the at least one comonomer reactant are reacted in aqueous solution to give trioxane and comonomer, to obtain a reaction mixture A | 11-20-2008 |
20090112017 | METHOD FOR PRODUCING POLYISOCYANATES - The invention relates to a process for preparing polyisocyanates by reacting primary amines with phosgene in the presence of a solvent, wherein ionic liquids are used as solvents. | 04-30-2009 |
20090112018 | METHOD FOR PRODUCING POLYISOCYANATES - The invention provides a process for preparing isocyanates by reacting the corresponding amines with phosgene in the presence of solvents, wherein compounds which form salt melts with hydrogen chloride are used as solvents. | 04-30-2009 |
20090187033 | INTEGRATED METHOD FOR THE PREPARATION OF TRIOXANE FROM FORMALDEHYDE - An integrated process for preparing trioxane from formaldehyde, comprising the steps of:
| 07-23-2009 |
20090221846 | METHOD FOR PRODUCING ISOCYANATES - The present invention relates to a process for preparing isocyanates and an apparatus suitable for this purpose, and also its use. | 09-03-2009 |
20090275775 | METHOD FOR PRODUCING ISOCYANATES - The invention relates to a multistage process for the continuous preparation of organic, distillable isocyanates, preferably diisocyanates, particularly preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic amines with urea and alcohols to liberate ammonia and form low molecular weight monomeric urethanes and thermal dissociation of the latter, in which by-products formed are at least partly utilized. | 11-05-2009 |
20090281350 | METHOD FOR PRODUCING ISOCYANATES - The invention provides a process for preparing isocyanates by reacting amines with phosgene, wherein the amine or a mixture of amine and a solvent is mixed in the form of an aerosol with gaseous phosgene and the amine is subsequently reacted with phosgene. | 11-12-2009 |
20090292100 | PROCESS FOR PREPARING PENTAMETHYLENE 1,5-DIISOCYANATE - The present invention relates to a process for preparing pentamethylene 1,5-diisocyanate, to pentamethylene 1,5-diisocyanate prepared in this way and to the use thereof. | 11-26-2009 |
20100041915 | METHOD FOR PRODUCING ISOCYANATES - The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase. | 02-18-2010 |
20100056822 | METHOD FOR PRODUCING ISOCYANATES - The invention relates to a process for preparing isocyanates in the gas phase. | 03-04-2010 |
20100076218 | METHOD FOR PRODUCING ISOCYANATES - The invention relates to a process for preparing isocyanates in the gas phase. | 03-25-2010 |
20100121081 | METHOD FOR SEPARATING TRIOXANE FROM A TRIOXANE/FORMALDEHYDE/WATER MIXTURE BY MEANS OF PRESSURE CHANGE RECTIFICATION - A process for removing trioxane from a use stream I of formaldehyde, trioxane and water, by
| 05-13-2010 |
20100130756 | METHOD FOR PRODUCING TRIOXANE FROM TRIOXYMETHYLENE GLYCOL DIMETHYL ETHER - A process for preparing trioxane from trioxymethylene glycol dimethyl ether (POMDME | 05-27-2010 |
20100145079 | METHOD FOR PRODUCING CYCLIC FORMALDEHYDE DERIVATIVES FROM POLYOXY DIALKYL ETHERS - A process for preparing trioxane from trioxymethylene glycol dimethyl ether (POMDME | 06-10-2010 |
20100152466 | INTEGRATED METHOD FOR PRODUCING TRIOXANE FROM FORMALDEHYDE - The invention relates to an integrated process for preparing trioxane from formaldehyde in which a stream A | 06-17-2010 |
20100217035 | PROCESS FOR PREPARING ISOCYANATES - The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase. | 08-26-2010 |
20100227997 | METHOD FOR PREPARING ISOCYANATE ADDUCTS - The present invention provides a process for working up isocyanate adducts, comprising the steps of
| 09-09-2010 |
20100270140 | METHOD FOR SEPARATING TIOXANE FROM A TRIOXANE/FORMALDEHYDE/WATER MIXTURE BY MEANS OF PRESSURE CHANGE RECTIFICATION - A process for separating trioxane from a feed stream I comprising formaldehyde, trioxane and water, in which
| 10-28-2010 |
20100274046 | METHOD FOR PRODUCING ISOCYANATES - The present invention relates to a multiple-stage process for the continuous preparation of organic, distillable polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic poly-amines with ureas to form low-molecular monomeric polyureas, and the thermal decomposition thereof. | 10-28-2010 |
20100280195 | PROCESS FOR PREPARING POLYOXYMETHYLENE HOMOPOLYMERS OR COPOLYMERS BY HOMOPOLYMERIZATION OR COPOLYMERIZATION OF TRIOXANE, STARTING FROM METHANOL - A process for preparing polyoxymethylene homopolymers or copolymers ( | 11-04-2010 |
20100317889 | PROCESS FOR PREPARING ISOCYANATES - Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel. | 12-16-2010 |
20100324311 | METHOD FOR THE PRODUCTION OF CRUDE TRIOXANE - A process for preparing crude trioxane ( | 12-23-2010 |
20110021836 | METHOD FOR TREATING RESIDUES FROM THE PRODUCTION OF ISOCYANATES - The invention relates to a process for the work-up of residues from the production of isocyanates, which comprises the steps:
| 01-27-2011 |
20110124908 | PROCESS FOR PREPARING ISOCYANATES - The invention provides a process for preparing polyisocyanates, comprising the steps of
| 05-26-2011 |
20110178329 | PROCESS FOR PREPARING ISOCYANATES BY THERMAL DISSOCIATION OF CARBAMATES - The invention relates to a process for preparing isocyanates by thermal dissociation of carbamates and separation by distillation of the reaction mixture from the carbamate dissociation, comprising the corresponding isocyanate and the corresponding alcohol, by distillation in a column (K) having an enrichment section (V) and a stripping section (A), where the carbamate (1) is introduced between the enrichment section (V) and the stripping section (A) and the isocyanate is taken off as a constituent of the bottom stream (2) and the alcohol is taken off as a constituent of the overhead stream (3) from the column (K), in the presence of an inert solvent, wherein an intermediate boiler having a boiling point between the boiling point of the isocyanate and the boiling point of the alcohol under the operating conditions of the carbamate dissociation is used as inert solvent and is fed as external runback (4) in liquid form in a purity of >95% by weight, based on the total weight of the external runback (4), in the upper region of the enrichment section (V) and as gaseous, superheated stream (5) into the lower region of stripping section (A) at one or more points. | 07-21-2011 |
20110207961 | PROCESS FOR PREPARING ISOCYANATES - The invention relates to an improved multistage process for the continuous preparation of diisocyanates by reaction of the corresponding diamines with carbonic acid derivatives and alcohols to form low molecular weight monomeric urethanes and thermal dissociation of the latter. | 08-25-2011 |
20110251425 | PROCESS FOR PREPARING AROMATIC ISOCYANATES - The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the liquid phase, if appropriate in the presence of at least one inert medium, in which the amine and the phosgene are first mixed in a mixing chamber ( | 10-13-2011 |
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 |
20110306795 | PROCESS FOR THE PREPARATION OF NITRATED AROMATICS AND MIXTURES THEREOF - A process for the preparation of mononitroaromatics and dinitroaromatics, in which a hydrate melt of at least one metal nitrate M(NO | 12-15-2011 |
20110313192 | HETEROGENEOUSLY CATALYZED CARBAMATE DISSOCIATION FOR SYNTHESIS OF ISOCYANATES OVER SOLID LEWIS ACIDS - Proposed is a process for preparing isocyanates by dissociating the corresponding carbamates, which comprises dissociating the carbamates in the presence of a heterogeneous Lewis-acidic catalyst. | 12-22-2011 |
20120004446 | PROCESS AND APPARATUS FOR PREPARING ISOCYANATES - The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase, optionally in the presence of an inert medium, in which phosgene and amine are first evaporated and then superheated further to reaction temperature, and the superheated phosgene and amine are mixed and fed to a reactor in which the phosgene and the amine are converted to the isocyanate, wherein the residence time of the phosgene at temperatures greater than 300° C. is not more than 5 s, and/or the temperature of heat transfer surfaces in contact with phosgene is not more than 20 K above the phosgene temperature to be established. The invention further relates to an apparatus for preparing isocyanates by reacting the corresponding amines with phosgene in the gas phase. | 01-05-2012 |
20120035396 | PROCESS FOR PREPARING MDA VIA THE STAGE OF THE AMINAL - The invention relates to a process for preparing methylenediphenyldiamine (MDA), comprising the following steps a) to c):
| 02-09-2012 |
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 |
20120157722 | PROCESS FOR PREPARING MONONITRATED ORGANIC COMPOUNDS - The present invention relates to a process for continuously preparing a mononitrated organic compound, especially a process for preparing mononitrobenzene. The invention relates more particularly to an improved continuous adiabatic process for preparing nitrobenzene. | 06-21-2012 |
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 |
20120172621 | PROCESS FOR PREPARING ISOCYANATES - The invention relates to a multistage process for the continuous preparation of organic, distillable polyisocyanates, preferably diisocyanates, particularly preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic polyamines with carbonic acid derivatives and alcohols to form low molecular weight monomeric polyurethanes and thermal dissociation of the latter, in which the polyisocyanates produced and unusable residues are separated off at particular stages of the reaction and reusable by-products and intermediates are recirculated to preceding stages. | 07-05-2012 |
20120197038 | PROCESS FOR PREPARING ISOCYANATES - Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel. | 08-02-2012 |
20120209024 | PROCESS FOR COPRODUCING DI- AND/OR POLYISOCYANATES AND GLYCOLS - A process for coproducing di- and/or polyisocyanates and glycols, comprising process stages A, B, C and E for preparing glycols and process stages A, C, D, E, F and G for preparing di- and/or polyisocyanates, | 08-16-2012 |
20120245377 | PROCESS FOR PREPARING ISOCYANATES BY THERMALLY CLEAVING CARBAMATES - A process is proposed for preparing isocyanates by thermally cleaving carbamates to obtain a carbamate cleavage gas comprising the corresponding isocyanate and the corresponding alcohol, which comprises quenching the carbamate cleavage gas in the presence of an ether which functions as an inhibitor for the reverse reaction of the isocyanate with the alcohol. | 09-27-2012 |
20120253063 | PROCESS FOR PREPARING ISOCYANATES - Process for preparing aromatic isocyanates by reacting the corresponding formamides with an oxygen-comprising gas over noble metal catalysts at temperatures of from 300 to 600° C. and a contact time of from 1 to 1000 ms, wherein:
| 10-04-2012 |
20120253072 | PROCESS FOR THE PREPARATION OF AROMATIC FORMAMIDES - The invention relates to a process for the preparation of formamides by reacting aromatic amines with a formic acid ester in the presence of a catalyst, wherein the catalyst is a phosphorus-containing acid or a Lewis-acidic metal salt. | 10-04-2012 |
20120302786 | PROCESS FOR PREPARING POLYISOCYANATES FROM BIOMASS - The present invention relates to a process for preparing polyisocyanates from natural raw material sources, in which a composition comprising low molecular weight aromatics which comprise at least one hydroxy group or at least one alkoxy group per molecule (oxyaromatics) is produced from a biomass material, these oxyaromatics are converted into the corresponding aromatic amines and, optionally after condensation with formaldehyde, reacted further with phosgene to give compounds comprising isocyanate groups. | 11-29-2012 |
20130109883 | PROCESS FOR PREPARING ISOCYANATES AND/OR POLYISOCYANATES | 05-02-2013 |