Process for recovering methacrolein

Details Process for recovering methacrolein Process for recovering methacrolein

C - Chemistry, Metallurgy

07

C

260/574.5, 260/5

C07C 47/22 (2006.01) C07C 45/35 (2006.01) C07C 45/37 (2006.01) C07C 45/78 (2006.01) C07C 45/81 (2006.01) C07C 51/21 (2006.01) C07C 51/48 (2006.01) C07C 57/05 (2006.01)

Patent

CA 1307004

Abstract of the Disclosure A process for recovering methacrolein which comprises a reaction step (A) comprising catalytically oxidizing isobutylene, t-butanol, methacrolein, isobutyl aldehyde or isobutyric acid or a mixture thereof with a gas containing molecular oxygen in a vapor phase, a methacrylic acid condensation step (B) comprising con- tacting a reaction product gas obtained in the step (A) with an aqueous phase containing methacrylic acid and acetic acid, by which obtaining an aqueous solution of methacrylic acid, a methacrylic acid extraction step (C) comprising extracting methacrylic acid from the aqueous solution of methacrylic acid obtained in the step (B) using a saturated hydrocarbon having 6 to 9 carbon atoms as an extraction solvent into said solvent and separating the extracted methacrylic acid to a solvent phase and an aqueous phase containing acetic acid, a methacrolein recovery step (D) comprising contacting a gas containing methacrolein and methacrylic acid discharged from the step (B) with an aqueous phase containing methacrylic acid and acetic acid, by which recovering methacrolein and methacrylic acid contained in said gas into said aqueous phase, a methacrolein desorption step (E) com- prising contacting an aqueous phase containing meth- acrylic acid, acetic acid and methacrolein discharged from the step (D) with a gas containing molecular oxygen, by which desorbing methacrolein, and a methacrylic acid recovery step (F) comprising contacting a gas containing methacrylic acid and methacrolein desorbed from the step (E) with an aqueous phase containing acetic acid, by which obtaining a gas containing methacrolein, at the same time, recovering methacrylic acid into said aqueous phase, characterized by circulating an aqueous phase containing acetic acid discharged from the methacrylic acid extraction step (C) in the methacrylic acid recovery step (F), circulating an aqueous phase containing methacrylic acid and acetic acid discharged from the methacrolein desorption step (E) in the methacrylic acid condensation step (B) and/or the methacrolein recovery step (D) and circulating a gas containing methacrolein discharged from the methacrylic acid recovery step (F) in the reaction step (A).

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