Process for purification of the off-gases resulting from the pro

Details Process for purification of the off-gases resulting from the pro Process for purification of the off-gases resulting from the pro

1979-06-11

1981-02-17

Killos, Paul J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 6310

Patent

active

042514576

ABSTRACT:
A process for purification of the off-gases resulting from the production of benzoyl chloride by phosgenation of benzoic acid from phosgene comprising recovery of phosgene from said off-gases by means of a selective absorbent, i.e. benzoyl chloride at a temperature within the range of from 1.degree. to 40.degree. C. The recovered phosgene is recycled to the production of benzoyl chloride. The process is technologically simple, it makes possible to purify the off-gases without decomposition of phosgene thus preventing pollution of the environments; it also makes possible to simplify utilization of hydrogen chloride contained in the off-gases and, thereby, simplify preparation of commercial hydrochloric acid.

REFERENCES:
patent: 2764607 (1956-09-01), Hieserman

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