Separation of monoalkyl maleate from dialkyl maleate

Details Separation of monoalkyl maleate from dialkyl maleate Separation of monoalkyl maleate from dialkyl maleate

1987-03-31

1988-04-26

Bascomb, Wilbur

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

203 77, 203 81, 203 89, 203DIG19, 549326, 560190, 560191, 560204, 568864, B01D 314, C07C 6754

Patent

active

047402725

ABSTRACT:
A method of producing substantially pure dialkyl maleate by separating monoalkyl maleate from dialkyl maleate in a short residence time distillation zone while minimizing reversion of the monoalkyl maleate to alkanol and maleic anhydride and without having to neutralize the monoalkyl maleate.

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: 4584419 (1986-04-01), Sharif et al.
Chemical Abstracts, vol. 67, No. 25, Dec. 18, 1967, p. 10964 Abst. No. 116, 520 g, Gordinskii, B. Y. et al., "Preparation and Separation of Pure Monoalkyl Maleates".

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