Process for producing phthaloyl dichlorides of high purity

Details Process for producing phthaloyl dichlorides of high purity Process for producing phthaloyl dichlorides of high purity

1977-10-25

1979-08-21

Schwartz, Gerald A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

204158HA, 204163R, C07C 5158

Patent

active

041653378

ABSTRACT:
A batchwise or continuous process for producing isophthaloyl dichloride or terephthaloyl dichloride having a high purity which comprises, in combination, (1) a first step of producing .alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.'-hexachloroxylene by reacting meta- or para-xylene with chlorine under the irradiation of ultraviolet-containing rays, the reaction being carried out in the presence of, as a solvent, .alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.'-hexachloroxylene added at the outset of the reaction; (2) a second step of producing isophthaloyl dichloride or terephthaloyl dichloride by reacting the .alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.'-hexachloroxylene obtained in the first step with isophthalic acid or terephthalic acid; and (3) a third step of purifying the isophthaloyl dichloride or terephthaloyl dichloride obtained in the second step by dissolving the isophthaloyl dichloride or terephthaloyl dichloride in 0.3 to 6 parts by weight; per part by weight of the phthaloyl dichloride, of C.sub.6 -C.sub.10 aliphatic hydrocarbon solvent, and cooling the solution to a temperature of the specified range thereby to recrystallize the phthaloyl dichloride.

REFERENCES:
patent: 4029560 (1977-01-01), Yoshinaka et al.
patent: 4048033 (1977-09-01), Yoshinaka et al.

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