Purification process of methacrylic acid

Details Purification process of methacrylic acid Purification process of methacrylic acid

1991-09-10

1993-03-23

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562532, 562545, 562600, C07C 5116, C07C 51235, C07C 5142

Patent

active

051965780

ABSTRACT:
A process is provided for the purification of methacrylic acid. The process can easily remove dibasic acids and aldehydes containing in trace amounts as impurities. According to the process, crude methacrylic acid obtained as an aqueous solution by vapor-phase catalytic oxidation of isobutylene, tertiary butanol, methacrolein or isobutyl aldehyde is treated with at least one compound selected from the group consisting of m-aminophenol, m-phenylenediamine, 2,4-diaminotoluene and 2,4-diamino-diphenylamine, followed by distillation, optionally, in the presence of a p-phenylene diamine.

REFERENCES:
patent: 3893895 (1975-07-01), Dehnert et al.
patent: 4001317 (1977-01-01), Grasselli et al.
patent: 4301031 (1981-11-01), Shaw et al.

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