Quenching process of reaction product gas containing methacrylic

Details Quenching process of reaction product gas containing methacrylic Quenching process of reaction product gas containing methacrylic

1988-06-27

1991-01-22

Garner, Vivian

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

Organic compounds

Carboxylic acids and salts thereof

562485, 562532, 562538, 562545, 568459, 568471, 568476, 568492, C07C 5707, C07C 57075, C07C 5150, C07C 4722, C07C 4586, C07C 4581

Patent

active

049872524

ABSTRACT:
In order to recover methacrolein and/or methacrylic acid by quenching a reaction product gas obtained by catalytic oxidation of isobutylene or the like, the reaction product gas is charged into a quench column through a double-wall pipe and is then brought into contact with a condensate as a cooling medium. Deposition of terephthalic acid and the like inside the column is prevented by controlling the temperature of a bottom in the quench column and that of an overhead gas of a quench column unit. An aromatic carboxylic acid, aromatic aldehyde, metal powder is added to an aqueous solution of methacrylic acid, which contains terephthalic acid and the like, so that the terephthalic acid and the like are caused to precipitate for their removal.

REFERENCES:
patent: 4554054 (1985-11-01), Coyle

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