Method for the preparation of chloroformate compositions

Details Method for the preparation of chloroformate compositions Method for the preparation of chloroformate compositions

1985-10-24

1987-01-20

Helfin, Bernard

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

Organic compounds

Halocarbonate esters

558280, 558282, C01B 3124

Patent

active

046380779

ABSTRACT:
Chloroformate compositions, particularly bischloroformate compositions, are prepared by the reaction of phosgene with a hydroxy compound, preferably a dihydroxy compound such as bisphenol A, in a heterogeneous mixture, while adding a hydrogen chloride scavenger comprising aqueous base as necessary and maintaining a pH of 0.5-8 during the phosgene addition. When a polyhydroxy compound is employed and the temperature is above 30.degree. C., the phosgene addition rate is maintained at a level high enough to effect rapid and complete reaction with dissolved hydroxy compound. This method uses substantially less phosgene than methods involving a higher pH.

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