Method of isolating methacrylic acid

Details Method of isolating methacrylic acid Method of isolating methacrylic acid

1987-01-16

1990-05-15

Gray, Bruce D.

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

Organic compounds

Carboxylic acids and salts thereof

562532, 562538, 562545, C07C 5148

Patent

active

049259814

ABSTRACT:
A method of isolating and recovering methacrylic acid from a methacrylic acid-containing reaction product gas resulting from the vapor-phase catalytic oxidation of isobutylene, tertiary butanol or isobutyraldehyde, which comprises introducing the reaction product gas comprising methacrylic acid and various by-products including high boiling substances at a high temperature of 250.degree. to 300.degree. C. into a cooling zone, rapidly cooling the gas therein to a temperature of not more than 100.degree. C. to condense methacrylic acid and thus isolate methacrylic acid, while also converting the high boiling substances to fumes, thereafter introducing the cooled gas containing said fumes into a venturi scrubber, contacting it therein with an aqueous medium to remove said fumes, finally introducing the treated gas into a methacrylic acid-absorbing zone and absorbing methacrylic acid by absorption into an aqueous medium.

REFERENCES:
patent: 3388897 (1968-06-01), Calaceto
patent: 3405172 (1968-10-01), Brown et al.
patent: 3433840 (1969-03-01), Shima et al.
patent: 3664968 (1972-05-01), Eden
Nippon Kayaku Co., Ltd., Chemical Abstracts, vol. 96, No. 35874x (1982).

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