Process for the manufacture of aromatic dicarboxylic acid chlorides
US4129594A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1977 |
| Grant date | Dec 12, 1978 |
| Priority date | — |
| Expiry date | Oct 27, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/64
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.