Purification of acid halides
US4693851A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1986 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | Feb 28, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/64
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of purifying an aromatic carboxylic acid halide, for example p-phenoxybenzoyl chloride, comprising the steps of: (a) adding an acidic catalyst, for example a molecular sieve, to the acid halide; (b) heating the resulting mixture of the acidic catalyst and the acid halide to a temperature of about 180.degree. C. to about 250.degree. C. for a period of at least 0.5 hours; (c) distilling the mixture to obtain acid halide substantially free of aldehyde and the halo derivative thereof. Optionally, a reactive aromatic compound may be added to the mixture of the acid halide and the acidic catalyst before the heating step. The process is particularly useful for providing aromatic acid halides of sufficient purity for preparing melt stable aromatic polyketones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.