Process for the production of aromatic carboxylic acid...

Details Process for the production of aromatic carboxylic acid... Process for the production of aromatic carboxylic acid...

C - Chemistry, Metallurgy

07

C

260/539.2

C07C 63/15 (2006.01) C07C 51/60 (2006.01)

Patent

CA 1183550

A PROCESS FOR THE PRODUCTION OF AROMATIC CARBOXYLIC ACID CHLORIDES Abstract of the Disclosure A single-stage process for the production of pure, particularly sulphur-free, aromatic carboxylic acid chlorides by reacting an aromatic carboxylic acid containing from 1 to 3 carboxyl groups or a correspond- ing mixture of aromatic carboxylic acids with thionyl chloride in the presence of a catalyst, wherein tertiary phosphine oxides or their reaction products with thionyl chloride and/or the acid chloride to be formed are used as catalysts, and the use of the aromatic dicarboxylic acid dichlorides and tricarboxylic acid trichlorides obtained for the production of polycondensates.

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