Obtaining very pure maleic anhydride from crude maleic anhydride

Details Obtaining very pure maleic anhydride from crude maleic anhydride Obtaining very pure maleic anhydride from crude maleic anhydride

1986-01-22

1990-10-09

Manoharan, Virginia

Distillation: processes, separatory

With fractional condensation of vapor outside still

203 99, 203DIG19, 549262, B01D 500

Patent

active

049618270

ABSTRACT:
Very pure maleic anhydride having a stable color is obtained by fractional distillation of crude maleic anhydride by a method in which the maleic anhydride vapor separated off from low boilers and high boilers is partially condensed so that from 0.5 to 15% by weight of the maleic anydride vapor is separated off from the vapor phase as a liquid precondensate, and the remaining very pure maleic anhydride vapor is then completely condensed.

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