Manufacture of phthaloyl chlorides

Details Manufacture of phthaloyl chlorides Manufacture of phthaloyl chlorides

1990-08-20

1992-05-12

Killos, Paul J.

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

Organic compounds

Carboxylic halides

562888, 562889, 562897, C07C 5160, C07C 51083

Patent

active

051130165

ABSTRACT:
Excess terephthalic acid or isophthalic acid is reacted with a phosgene/DMF complex nearly to completion in one or more stages to form terephthaloyl chloride or isophthaloyl chloride; in another stage, by-product formylbenzoyl chloride is oxidized and terephthaloyl chloride or isophthaloyl chloride containing less than 100 ppm of formylbenzoyl chloride and/or dichlorotoluoylchloride is recovered.

REFERENCES:
patent: 2367501 (1945-01-01), Hull et al.
patent: 2575159 (1951-11-01), Chassaing et al.

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