Phosgenation under pressure of acids and of anhydrides of acid c

Details Phosgenation under pressure of acids and of anhydrides of acid c Phosgenation under pressure of acids and of anhydrides of acid c

1997-11-17

1999-12-14

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic halides

C07C 5158

Patent

active

060020431

ABSTRACT:
Process for the phosgenation of monocarboxylic acids and/or anhydrides, characterized in that the acid and/or the anhydride is treated, in the presence or absence of solvent, with a molar excess of phosgene, preferably 2 to 15 times as much phosgene as acid, at temperatures between 80 and 200.degree. C. and at pressures between 2 and 60 bar, with or without catalyst, preferably in the absence of any catalyst.
Process furthermore characterized in that pressure is used to facilitate the separation of the hydrochloric acid, the carbon dioxide and the phosgene, in a column which is external to the reactor.

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