Patent application number | Description | Published |
20090005596 | Process for Simultaneously Preparing 4,4'- Diphenylmethanediamine and Diphenylmethane Diisocyanate and Polyphenylenepolymethylene Polyisocyanates - The invention provides a | 01-01-2009 |
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 |
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 |
20110124908 | PROCESS FOR PREPARING ISOCYANATES - The invention provides a process for preparing polyisocyanates, comprising the steps of
| 05-26-2011 |
20110137067 | METHOD FOR PRODUCING URETHANES COMPOSED OF DI-FUNCTIONAL AROMATIC AMINES AND DIALKYL CARBONATES - A process for preparing urethanes by reacting aromatic diamines with a dialkyl carbonate, wherein the alkyl radical of the organic dialkyl carbonate comprises 2-18 carbon atoms and one or more heteroatoms and the reaction is performed in the presence of a catalyst. | 06-09-2011 |
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 |
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 |
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 |
20120123153 | METHOD FOR PURIFYING MIXTURES COMPRISING 4,4'-METHYLENEDIPHENYL DIISOCYANATE - The invention relates to a method for purifying mixtures comprising 4,4′-methylenediphenyl diisocyanate, which comprises purifying by distillation a mixture I comprising 4,4′-methylene-diphenyl diisocyanate by means of a column K1, wherein the gaseous stream comprising the mixture I is brought into contact in the column K1 with at least one liquid compound A which has the same or higher boiling point than 4,4′-methylenediphenyl diisocyanate, and wherein the gaseous stream O obtained at the top of the column and comprising 4,4′-methylenediphenyl diisocyanate is cooled in a maximum of 5 seconds to a temperature of 20° C. to 60° C. | 05-17-2012 |
20120142960 | METHOD FOR PURIFYING MIXTURES COMPRISING 4,4'-METHYLENEDIPHENYL DIISOCYANATE - The invention relates to a method for purifying mixtures comprising 4,4′-methylenediphenyl diisocyanate, which comprises purifying by distillation a mixture I comprising 4,4′-methylenediphenyl diisocyanate having a hydrolyzable chlorine content as specified in ASTM D4663-10 of greater than 100 ppm by means of a column K | 06-07-2012 |
20120203022 | METHOD FOR PRODUCING URETHANES - The content of the invention is a process for preparing urethanes by reaction of aromatic amines with a dialkyl carbonate, wherein the alkyl radical of the organic dialkyl carbonate comprises 4-18 carbon atoms and is branched in the 2 position, and the reaction is performed in the presence of a substoichiometric amount of base, based on the amino groups. | 08-09-2012 |
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 |
20130144080 | PROCESS FOR OBTAINING A DIALKYL CARBONATE AND AN ALKYLENE GLYCOL - The invention relates to a process for obtaining a dialkyl carbonate and an alkylene glycol from a stream comprising dialkyl carbonate, alkylene carbonate, alkylene glycol and alcohol, comprising the following steps:
| 06-06-2013 |