Recovering maleic anhydride from the effluent from the productio

Details Recovering maleic anhydride from the effluent from the productio Recovering maleic anhydride from the effluent from the productio

1974-10-25

1976-06-22

Wolk, Morris O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

159 49, B01D 122, B01D 126, C07C 5714

Patent

active

039651266

ABSTRACT:
Maleic anhydride is recovered by evaporating the effluent from the production of phthalic anhydride at from 40.degree. to 150.degree.C and from 50 to 760 mm to a water content of less than 10% by weight, heating the concentrate in a thin-film or falling-film evaporator at from 100 to 600 mm at from 120.degree. to 180.degree.C and distilling it in a column. The pure maleic anhydride is withdrawn laterally and the aqueous condensate is recycled to the offgas scrubber.

REFERENCES:
patent: 2683110 (1954-07-01), Rousseau
patent: 2688622 (1954-09-01), Jaquay
patent: 2696489 (1954-12-01), Adams et al.
patent: 3261847 (1966-07-01), Sullivan
Kirk-Othmer, Encyclopedia of Chemical Technology, Sec. Edition vol. 12, p. 829.

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