Process for the production of dialkyl maleates

Details Process for the production of dialkyl maleates Process for the production of dialkyl maleates

1987-07-31

1989-01-03

Lone, Werren B.

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

Organic compounds

Carboxylic acid esters

203 14, 203DIG2, 203DIG11, 502 11, 560191, 562595, C07C 6703

Patent

active

047958243

ABSTRACT:
A process is described for the production of a dialkyl maleate by reaction of maleic anhydride with an alkyl alcohol in a monoesterification zone to form the corresponding monoalkyl maleate, followed by reaction of resulting monoalkyl maleate with further alkyl alcohol to form the corresponding dialkyl maleate, which includes the steps of supplying a first liquid feed comprising said monoalkyl maleate to a secondary esterification zone containing a charge of a solid esterification catalyst, supplying a second feed stream comprising said alkyl alcohol to said secondary esterification zone, maintaining said secondary esterification zone at an elevated temperature sufficient to form or to maintain therein a vaporous stream containing said alkyl alcohol, intimately contacting said first liquid feed in said secondary esterification zone in the presence of said catalyst with said vaporous feed stream, recovering from said secondary esterification zone a vaporous effluent stream containing, in addition to alkyl alcohol vapor, also water in vapor form, said water being produced in said secondary esterification zone by esterification of said monoalkyl maleate with said alkyl alcohol, and recovering from said secondary esterification zone a liquid product stream containing said dialkyl maleate.

REFERENCES:
patent: 3862147 (1975-01-01), Cooley et al.
patent: 3886199 (1975-05-01), Suter et al.
patent: 4032458 (1977-06-01), Cooley et al.
patent: 4314947 (1982-02-01), Hohenschultz et al.
patent: 4361710 (1982-11-01), Weitz et al.
patent: 4481146 (1984-11-01), Leupold et al.
patent: 4562283 (1985-12-01), Schnabel et al.

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