Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Harunori Hirao0
Kouji Ueno0
Naoki Serata0
Takeshi Yokogoshiya0
Date of Patent
February 27, 2007
0Patent Application Number
108589350
Date Filed
June 2, 2004
0Patent Primary Examiner
Patent abstract
A method for producing acrylic acid by using an acrylic acid-containing solution of high concentration without azeotropic distillation is provided. This method of producing acrylic acid comprises introducing an acrylic acid-containing gas obtained by catalytic gas phase oxidation reaction into an absorption column and supplying the acrylic acid-containing solution to crystallization step thereby separating the solution into acrylic acid and residual mother liquid, and distilling at least part of the residual mother liquid and circulating the distillate obtained by the distillation to the absorption column.
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