Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1991-10-03
1993-09-28
Shaver, Paul F.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562538, 562545, 562599, 562600, C07C 5116, C07C 51235, C07C 5142
Patent
active
052488195
ABSTRACT:
In the production of methacrylic acid by the vapor phase catalytic oxidation of isobutylene, t-butanol, methacrolein isobutyl aldehyde or isobutyric acid, or mixture thereof, the reaction product gas is condensed by contact with an aqueous phase containing methacrylic acid and acetic acid thereby forming an aqueous solution of methacrylic acid and a gas phase containing methacrolein and methacrylic acid. The aqueous solution of methacrylic acid is extracted with a saturated hydrocarbon solvent containing from 6-9 carbon atoms. The methacrylic acid is extracted into the solvent phase and an aqueous phase containing acetic acid is also formed. Methacrolein is recovered from the gas containing methacrolein and methacrylic acid by contacting the gas with an aqueous phase containing methacrylic acid and acetic acid. An aqueous phase containing methacrylic acid, acetic acid and methacrolein is formed in the methacrolein recovery step. This aqueous phase is contacted with a molecular oxygen containing gas to desorb methacrolein into a gas containing methacrylic acid and methacrolein and also forming an aqueous phase containing methacrylic acid and acetic acid. This aqueous phase is recycled to either or both of the methacrylic acid condensation step and the methacrolein recovery step. Methacrylic acid is recovered from the gas containing methacrylic acid and methacrolein produced in the methacrolein desorption step by mixing this gas with an aqueous phase containing acetic acid recovered from the methacrylic acid extraction step (C). This results in a gas-containing methacrolein which is recycled to the vapor phase reaction.
REFERENCES:
patent: 3957880 (1976-05-01), Sato et al.
patent: 4147721 (1979-04-01), Leacock
Japanese Abstract 62-96447, vol. 11, No. 307(C-450)(2754) (1987).
Baba Masao
Matsumoto Syoichi
Ogata Yosuke
Ueoka Masatoshi
Yoshida Hiroshi
Conrad III Joseph
Nippon Shokubai Kagaku Ogyo Co., Ltd.
Shaver Paul F.
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