Basf Aktiengesellschaft

Basf Se Corporation

Ralph Busch

Jochem Henkelmann

Theodor Weber

Armin Stamm

Alexander Panchenko

Heinz-Josef Kneuper

Andreas Weickgenannt

Jan-Oliver Weidert

Winfried M&uuml;ller

Artur Kozicki

Sandra Kramp

Regina Benfer

Klaus Breuer

Thorsten Rohde

Norbert Gutfrucht

A process for preparing trans-enriched MDACH, including: distilling an MDACH starting mixture in the presence of an auxiliary, which is an organic compound having a molar mass of 62 to 500 g/mol, a boiling point at least 5&#xb0; C. above the boiling point of cis,cis-2,6-diamino-1-methylcyclohexane, and 2 to 4 functional groups, each of which is independently an alcohol group or a primary, secondary or tertiary amino group. The MDACH starting mixture includes 0 to 100% by weight of 2,4-MDACH and 0 to 100% by weight of 2,6-MDACH, based on the total amount of MDACH present in the MDACH starting mixture. The MDACH starting mixture includes both trans and cis isomers. Trans-enriched MDACH includes 0 to 100% by weight of 2,4-MDACH and 0 to 100% by weight of 2,6-MDACH, where the proportion of trans isomers in the mixture is higher than the proportion of trans isomers in the MDACH starting mixture.

Method for producing cis- and trans-enriched MDACH

A method for isomerizing a starting mixture comprising 2,4-diamino-1-methylcyclohexane, 2,4-MDACH for short, 2,6-diamino-1-methylcyclohexane, 2,6-MDACH for short, or mixtures thereof, wherein the isomerization is carried out in the presence of a supported catalyst with zirconium dioxide as support and ruthenium as active metal.

Isomerization of MDACH

The invention relates to a process for the preparation of tetrasubstituted ureas by reaction of the corresponding amines with phosgene in the presence of an aqueous inorganic base at a temperature in the range from 0 to 150&#xb0; C., which comprises:

Method for the continuous production of tetra-substituted ureas

The invention relates to a method for producing acid chlorides by converting carboxylic acids with carbon oxychlorides or thionyl chloride in the presence of a catalyst adduct of an N,N-disubstituted formamide of general formula (I) and carbon oxychloride or thionyl chloride. In the formula, R and R , independently from one another, mean C - to C -alkyl or R and R together mean a C - or C -alkylene chain. According to the inventive method, hydrogen chloride is added during and/or after the conversion.

Method for producing acid chlorides

Method for purifying acid chlorides

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Worms, Germany

Ralph Busch