发明名称 |
Waste water treatment in the production of methacrylic acid |
摘要 |
A process for separation of methacrylic acid from a methacrylic acid-containing, gaseous reaction mixture obtained by subjecting methacrolein or a compound which can afford methacrolein under reaction conditions and molecular oxygen to gas phase reaction in the presence of a catalyst for oxidation under the coexistence of an inert gas for dilution which comprises (a) cooling the gaseous reaction mixture from a reactor wherein the gas phase reaction has been effected to separate into condensable components including methacrylic acid, acetic acid and water vapor as a condensed liquor and non-condensable components including methacrolein 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, characterized in that (1) the inert gas for dilution 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, whereby the amount of waste water to be discharged is much suppressed.
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申请公布号 |
US4618709(A) |
申请公布日期 |
1986.10.21 |
申请号 |
US19810229844 |
申请日期 |
1981.01.30 |
申请人 |
SUMITOMO CHEMICAL COMPANY, LIMITED |
发明人 |
SADA, MASAO;KATO, MICHIO;AYANO, MASAMI;ABE, TADASHI;MORIWAKI, MASANORI |
分类号 |
C02F1/00;C02F1/04;C02F9/00;C07C51/00;C07C51/48;C07C57/055;C07C57/07;C07C67/00;(IPC1-7):C07C51/25;C07C57/05 |
主分类号 |
C02F1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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