Purification of acid halides

Details Purification of acid halides Purification of acid halides

1986-02-28

1987-09-15

Killos, Paul J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260544B, 260544P, C07C 5164

Patent

active

046938516

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.

REFERENCES:
patent: 4136113 (1979-01-01), Johnston et al.
patent: 4374770 (1983-02-01), Hyatt et al.
patent: 4382898 (1983-05-01), Rudolph et al.
Clark, N. G. et al., Modern Organic Chemistry, at p. 470, (1964), Oxford Univ. Press.

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