Dehydration of maleic acid to form maleic anhydride

Details Dehydration of maleic acid to form maleic anhydride Dehydration of maleic acid to form maleic anhydride

1981-06-11

1983-11-08

Jiles, Henry R.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30760

Patent

active

044143982

ABSTRACT:
In the dehydration of maleic acid to form maleic anhydride, comprising a first stage of concentrating an aqueous solution of maleic acid to 85-95% by maleic acid, and a second stage of dehydrating the concentrated maleic acid into maleic anhydride, in at least one of the stages, a falling film tubular evaporator is employed. Prior to the dehydration stage, about 15-35 parts by weight of maleic anhydride is added per 10 parts of concentrated acid.

REFERENCES:
patent: 3476775 (1969-11-01), Sueur
patent: 3993671 (1976-11-01), Ramioulle
Perry et al., The Chemical Engineer's Handbook, 5th Ed., pp. 11-28, 11-29 and 11-30.
Lindsey, Chemical Engineering, (Apr. 1953), pp. 227, 231 & 232.

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