Process for producing (methyl) propenoic acid

Application Number: 00108025
Application Date: 2000.06.09
Publication Number: 1277183
Publication Date: 2000.12.20
Priority Information: 1999/6/10 JP 163233/1999
International: C07C57/05;C07C51/42
Applicant(s) Name: Nippon Shokubai Co., Ltd.
Inventor(s) Name: Nishimura Takeshi;Matsumoto Yukihiro
Patent Agency Code: 11021
Patent Agent: wang huimin
Abstract A method of manufacturing (meth)acrylic acid includes: a reaction step of carrying out a catalytic gas-phase oxidation reaction; an absorbing step of absorbing (meth)acrylic acid from a (meth)acrylic-acid-containing mixed gas prepared in the reaction step; a refinement step of separating, refining, and recovering (meth)acrylic acid from a (meth)acrylic-acid-containing liquid prepared in the absorbing step; and a recirculation step of recirculating (meth)acrylic acid contained in a vent gas produced in the refinement step to the absorbing step and/or the refinement step. The invention can improve the yield of the product (meth)acrylic acid and simultaneously eliminate environmental pollution.