John Pisanchyn

US Patent:

41295943, Dec 12, 1978

Filed:

Oct 27, 1977

Appl. No.:

5/846098

Inventors:

Josefina T. Baker - Mount Tabor NJ
John Pisanchyn - Olyphant PA
Stylianos Sifniades - Madison NJ

Assignee:

Allied Chemical Corporation - Morris Township, Morris County NJ

International Classification:

C07C 6330
C07C 6322
C07C 6338
C07C 6346

US Classification:

260544D

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.