Patent application number | Description | Published |
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 |
20110257431 | PROCESS FOR PRODUCING SIDE PRODUCT-FREE AMINOCARBOXYLATES - The present invention relates to a process for preparing aminocarboxylates, proceeding from amines, by employing a reaction sequence composed of ethoxylation to amino alcohols and subsequent oxidative dehydrogenation to the corresponding aminocarboxylates, especially the alkali metal or alkaline earth metal salts of the complexing agents MGDA (methylglycinediacetic acid), EDTA (ethylenediaminetetra-acetic acid) and GLDA (glutamic acid diacetic acid) or the free acids thereof. | 10-20-2011 |
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 |
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 |
20120264973 | PROCESS FOR PREPARING AMINOPOLYCARBOXYLATES PROCEEDING FROM AMINO ACIDS - The present invention relates to a process for preparing aminopolycarboxylates proceeding from an amino acid which, in a
| 10-18-2012 |
20120302783 | PROCESS FOR PREPARING AMINOPOLYCARBOXYLATES - What is proposed is a process for preparing aminopolycarboxylates proceeding from the corresponding polyalkanolamines by oxidative dehydrogenation in the presence of a catalyst comprising 1 to 90% by weight of copper, based on the total weight of the catalyst, using a base, which comprises first performing a partial conversion of the polyalkanolamine to a reaction mixture comprising the aminopolycarboxylate at a temperature in the range from 140 to 180° C. until at least 10 to 90 mol % of the polyalkanolamine has been depleted, and then continuing the conversion at elevated temperature. | 11-29-2012 |
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 |
20130165689 | PROCESS FOR PREPARING ONE OR MORE COMPLEXING AGENTS SELECTED FROM METHYLGLYCINEDIACETIC ACID, GLUTAMIC ACID DIACETIC ACID AND SALTS THEREOF - Process for preparing one or more complexing agents selected from methylglycinediacetic acid, glutamic acid diacetic acid and salts thereof | 06-27-2013 |