Process for the production of a dialkyl maleate

Details Process for the production of a dialkyl maleate Process for the production of a dialkyl maleate

1987-07-31

1988-08-23

Bascomb, Wilbur

Distillation: processes, separatory

With chemical reaction

203 33, 203 37, 203 38, 203 71, 203 77, 203 87, 203DIG19, 560191, B01D 314, C07C 6754

Patent

active

047658690

ABSTRACT:
A continuous process is described for the production of a substantially acid free dialkyl maleate, for example diethyl maleate, from a feed stream containing a major amount of dialkyl maleate and a minor amount of the corresponding monoalkyl maleate. This comprises continuously distilling the feed stream in a primary distillation zone, which can comprise a single distillation column or a series of distillation columns connected in series, so as to give (i) a bottom fraction containing monoalkyl maleate and dialkyl maleate in admixture, (ii) a vaporous fraction comprising alkanol, and (iii) an intermediate fraction that is substantially free from alkanol and comprises a major proportion of diethyl maleate and a minor proportion of maleic anhydride. The intermediate fraction (iii) is redistilled in a secondary distillation zone to yield (i) an overhead fraction containing maleic anhydride and (ii) a bottom fraction containing substantially acid free dialkyl maleate. The vaporous stream can be condensed to recover alkanol for recycle to a dialkyl maleate production facility.

REFERENCES:
patent: 2333666 (1943-11-01), Moore et al.
patent: 2938837 (1960-05-01), Meyer et al.
patent: 3681204 (1972-08-01), Mercier
patent: 3979443 (1976-09-01), Schwartz et al.
patent: 4032458 (1977-06-01), Cooley et al.
patent: 4361710 (1982-11-01), Weitz et al.
patent: 4562283 (1985-12-01), Schnabel et al.
patent: 4584419 (1986-04-01), Sharif et al.
Chemical Abstracts, vol. 67, No. 25, Dec. 18, 1967, p. 10964, Abst. #116,520g; Gordinskii, B. Y. et al, "Prepar. and Separation of the Monoalkyl Maleates".

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