Preparation of 3-chlorophthalic anhydride

Details Preparation of 3-chlorophthalic anhydride Preparation of 3-chlorophthalic anhydride

1995-12-28

1997-11-04

Manoharan, Virginia

Distillation: processes, separatory

With measuring, testing or inspecting

203 73, 203 74, 203 77, 203 80, 549250, B01D 342

Patent

active

056835531

ABSTRACT:
A process for preparing essentially pure 3-chlorophthalic anhydride from a mixture in which 3-chlorophthalic anhydride is present in addition to 4,5-dichlorophthalic anhydride, which involves first distilling off a mixture of 3-chlorophthalic anhydride and 4,5-dichlorophthalic anhydride, so that the obtained bottoms is essentially free of 4,5-dichlorophthalic anhydride, and then by distillation of the obtained bottoms, recovering 3-chlorophthalic anhydride in a second distillation step. The starting mixture is preferably prepared without solvent in a melt by incomplete chlorination of phthalic anhydride using FeCl.sub.3 as a catalyst.

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