Basf Se Corporation

Axel Franzke

Robert Baumann

Michael Bock

Eckhard Stroefer

Alfred Oftring

Torsten Mattke

Paul Klingelhoefer

Markus Christian Biel

Radwan Abdallah

Julia Leschinski

Armin Stamm

Thomas Heidenfelder

Joachim Pfeffinger

Markus Hartmann

Gerhard Theis

Eckhard Ströfer

Andreas Leitner

Jon S Speier

Matthias Kloetzer

Gordon Brasche

Constanze Franzke

Geert Janssens

Michael Lorenz

Marie Katrin Schroeter

Roderich Roettger

Friedhelm Teich

Marie Katrin SCHRÖTER

Marie Katrin Schröter

The invention relates to polyphenyl polymethylene polyisocyanates having an NCO number of at least 29% comprising less than 2% by weight ureas, less than 8% by weight carbodiimides or uretonimines and less than 1000 ppm organic chlorine compounds. The polyphenyl polymethylene polyisocyanates can be prepared according to the invention by reacting The polyphenyl polymethylene polyisocyanates can further be prepared according to the invention, prior to the thermal cleavage, by removing compounds having free amino groups or urea groups present in the carbamate crude mixture from the carbamate crude mixture by filtration of the carbamate crude mixture comprising the polyphenyl polymethylene polycarbamates over a solid acidic adsorbent in the presence of an acid dissolved in the carbamate crude mixture.

Low by-product content polyphenylene polymethylene polyisocyanates

Process for manufacturing a crystalline alkali metal salt of the general formula (I) [R&#x2014;CH(COO)&#x2014;N(CH&#x2014;COO)]M(I) wherein Mis selected from alkali metal cations, same or different, Ris selected from C-C-alkyl and CHCHCOOM, comprising the step of (b) crystallizing said alkali metal salt from an aqueous solution containing in the range of from 5 to 30% by weight of alkali metal hydroxide, referring to said aqueous solution.

Process for making a crystalline alkali metal salt of a complexing agent, and crystalline complexing agent

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, which comprises 

Process for coproducing di- and/or polyisocyanates and glycols

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.

Method for producing urethanes

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&#xb0; C. and a contact time of from 1 to 1000 ms, wherein:

Process for preparing isocyanates

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.

Process for preparing isocyanates by thermally cleaving carbamates

The present invention relates to a process for preparing aminopolycarboxylates proceeding from an amino acid which, in a first process step is reacted with ethylene oxide to give an intermediate mixture comprising the corresponding dialkanolamine, and then the intermediate mixture, in a second process step is converted catalytically using a base to the corresponding aminopolycarboxylate, wherein the amino acid, before the reaction with ethylene oxide in the first process step, is supplied to a partial neutralization with 0.70 to 0.99 equivalent of base per acid group, or, in the first process step, an amino acid which has already been partly neutralized with 0.70 to 0.99 equivalent of base per acid group is used.

Process for preparing aminopolycarboxylates proceeding from amino acids

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.

Method for producing urethanes composed of di-functional aromatic amines and dialkyl carbonates

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 &#x3e;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.

Process for preparing isocyanates by thermal dissociation of carbamates

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.

Process for the preparation of aromatic formamides

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&#xb0; C. until at least 10 to 90 mol% of the polyalkanolamine has been depleted, and then continuing the conversion at elevated temperature.

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Mannheim, Germany

Axel Franzke