C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/532.5
C07C 57/07 (2006.01) C02F 1/04 (2006.01) C02F 9/00 (2006.01) C07C 51/48 (2006.01)
Patent
CA 1146972
-1- Abstract The invention relates to a process for separation of methacrylic acid from a methacrylic acid-containing, gaseous reaction mixture obtained by subjecting methacro- lein, or a compound which can afford methacrolein under the reaction conditions, and molecular oxygen to gas phase reaction in the presence of a catalyst for oxidation in the presence of an inert gas for dilution. The process comprises (a) cooling the gaseous reaction mixture from a reactor wherein the gas phase reaction has been effected to separate it into condensable components including meth- acrylic acid, acetic acid and water vapor as a condensed liquor and non-condensable components including methacro- lein as a non-condensed gaseous mixture, (b) eliminating contaminating methacrolein from the condensed liquor, and (c) contacting the resulting condensed liquor with an organic solvent to extract methacrylic acid, followed by separation into an organic solvent solution including methacrylic acid and an aqueous solution as waste water. The important features are that (1) the inert gas for di- lution is a non-condensable gas or its mixture with water vapor and (2) the aqueous solution ultimately separated is evaporated and the evolved vapor is subjected to catalytic combustion with molecular oxygen. As a result of this process the amount of waste water to be discharged is much suppressed, which reduces pollution problems or the cost of treating the waste water to eliminate pollutants.
369642
Abe Tadashi
Ayano Masami
Kato Michio
Moriwaki Masanori
Sada Masao
Kirby Eades Gale Baker
Sumitomo Chemical Co. Ltd.
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