Process for the preparation of dimethylmaleate

Details Process for the preparation of dimethylmaleate Process for the preparation of dimethylmaleate

1988-03-21

1989-05-02

Lone, Werren B.

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

Organic compounds

Carboxylic acid esters

560190, C07C 6708

Patent

active

048270229

ABSTRACT:
An improved process for the preparation of dimethylmaleate by the esterification of maleic acid anhydride, maleic acid monomethylester, maleic acid or mixtures thereof with methanol in the presence of catalytic quantities of sulphuric acid, which comprises carrying out the esterification reaction within 20 to 120 minutes in a multistage bubble cap column reactor at temperatures of from 90.degree. to 140.degree. C. and with methanol excesses of from 0.4 to 2.0 mole per mole of the dimethylmaleate to be produced.

REFERENCES:
Chem. Abstracts, 106: 119 301w, (1987).
Kirk-Othmer, Encyclopedia of Chemical Technology, Third Edition, John Wiley & Sons, New-York-Chichester-Brisbane-Toronto, vol. 7 (1979), pp. 870-875.
Kirk-Othmer, Encyclopedia of Chemical Technology, Third Edition, John Wiley & Sons, New-York-Chichester-Brisbane-Toronto, vol. 19 (1982), p. 886.
J. R. Fair, Chem. Eng. 74, pp. 67-74, Jul. (1967).
R. A. Mashelkar, Brit. Chem. Eng. 15, (10) pp. 1297-1304, Oct. (1970).

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