Process for the manufacture of aromatic dicarboxylic acid chlori

Details Process for the manufacture of aromatic dicarboxylic acid chlori Process for the manufacture of aromatic dicarboxylic acid chlori

1977-10-27

1978-12-12

Schwartz, Gerald A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260544B, 260544P, C07C 6330, C07C 6322, C07C 6338, C07C 6346

Patent

active

041295943

ABSTRACT:
An improved process is described for preparing solutions or slurries of aromatic dicarboxylic acid chlorides in high purity, particularly terephthaloyl chloride, useful as an acylating agent for making polyesters from bisphenols, by adding an aromatic dicarboxylic acid to a liquid medium of phosgene in an inert chlorinated paraffinic hydrocarbon solvent, at a temperature of about 10.degree. to 50.degree. C, wherein at least 1.02 equivalents of a weak tertiary amine base per equivalent of carboxylic acid group is present in the reaction mixture throughout the reaction period, whereby a yield of dicarboxylic acid chloride of at least about 90% of theory, based on the total dicarboxylic acid employed in the reaction, is obtained.

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