Purification of maleic anhydride

Details Purification of maleic anhydride Purification of maleic anhydride

1973-10-05

1976-02-17

Trousof, Natalie

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603467, C07D30760

Patent

active

039391833

ABSTRACT:
A method for obtaining purified polycarboxylic anhydrides of good color stability which comprises combining and contacting a metal halide and P.sub.2 O.sub.5 or a perborate with the crude anhydride before final distillation of the crude anhydride. Preferred metal halides are alkaline earth and transition metal halides, with magnesium, calcium and iron chlorides being particularly preferred. The method is especially advantageously applied to maleic anhydride purification, especially maleic anhydride produced by butane oxidation.

REFERENCES:
patent: 2296218 (1942-09-01), Middleton, Jr.
patent: 3586703 (1971-06-01), Martinez et al.

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