C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/532.5, 260/5
C07C 51/48 (2006.01) C07C 45/78 (2006.01) C07C 47/22 (2006.01) C07C 51/42 (2006.01) C07C 57/075 (2006.01)
Patent
CA 1316545
- 50 - 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 tere- phthalic acid and the like, so that the terephthalic acid and the like are caused to precipitate for their removal.
570305
Fukada Isao
Isobe Takeshi
Iwasaki Kozo
Koshibe Minoru
Kuragano Morimasa
Kuraray Co. Ltd.
Mitsui Toatsu Chemicals Inc.
Sim & Mcburney
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