Method of preparing methacrylic acid

Details Method of preparing methacrylic acid Method of preparing methacrylic acid

1977-02-16

1978-11-28

Garner, Vivian

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

Organic compounds

Carboxylic acids and salts thereof

260604R, C07C 5132

Patent

active

041276035

ABSTRACT:
A method of preparing methacrylic acid, which comprises liquid-phase oxidation of alpha-methylacrolein with an oxygen-containing gas in a medium of an organic solvent at a temperature ranging from 50.degree. to 100.degree. C and under a pressure of from 1 to 50 atm in the presence of a heterogeneous catalyst such as borides, carbides or nitrides of elements pertaining to Groups IVB-VB of the periodic system, or aluminum boride, carbide or nitride and in the presence of a polymerization inhibitor, whereafter the desired product is separated from the resulting reaction mixture. The method according to the present invention makes it possible to produce methacrylic acid with a high selectivity (up to 86% as calculated for the reacted alpha-methylacrolein). Conversion degree of the starting aldehyde is as high as 55%. There is no formation of polymeric products during the oxidation process.

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