Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1995-10-31
1999-09-28
Geist, Gary
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562538, 562545, 562600, C07C 5116
Patent
active
059591420
ABSTRACT:
A process for producing refined methacrylic acid comprising the steps of oxidizing methacrolein and the like catalytically in a vapor phase to form a methacrylic acid-containing gas, cooling and condensing the gas to an aqueous methacrylic acid solution, adding to the solution an organic solvent that forms two liquid phases with water to carry out an extraction operation and thereby to obtain an extract, bringing the extract into contact with water to mix them together, separating the mixture into an organic phase and a water phase, and distilling the organic phase. According to this process, highly refined methacrylic acid containing little dibasic acids such as maleic acid and citraconic acid can be obtained economically and without increasing wastes that are unrecoverable to the process.
REFERENCES:
patent: 4533750 (1985-08-01), Matsumura et al.
Fujita Koji
Hase Tadaharu
Ikarashi Rensuke
Isobe Takeshi
Sezaki Yoshihiro
Geist Gary
Kuraray Co. Ltd.
Mitsui Chemicals Inc.
Padmanabhan Sreeni
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