Process for the preparation of dialkyl maleates

Details Process for the preparation of dialkyl maleates Process for the preparation of dialkyl maleates

1995-06-02

1997-07-15

Killos, Paul J.

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

Organic compounds

Carboxylic acid esters

C07C 6952

Patent

active

056485174

ABSTRACT:
A process has been found for the preparation of dialkyl maleates from maleic acid, maleic anhydride or monoalkyl maleates with C.sub.1 -C.sub.8 -alcohols, in particular ethanol, in the presence or absence of an acidic catalyst and at boiling heat, which is characterized in that the escaping water/alcohol/vapour mixture, together with its condensed phase if appropriate, is conducted as feed along a hydrophilic membrane at which it is purged of water and the dehydrated alcohol is returned to the reaction mixture.

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patent: 5248427 (1993-09-01), Spiske et al.
patent: 5360923 (1994-11-01), Nickel et al.
patent: 5427687 (1995-06-01), Blum et al.
H. Lothar, et al., Chemical Abstracts, vol. 105, p. 648, (1986).
R. Rautenbach, et al., Chem.-Ing.-Tech., vol. 61, No. 7, S. 535-544 1989.
U. Sander, et al., Journal of Membrane Science, vol. 61, pp. 113-129, (1991).

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