Title:
METHOD FOR PRODUCTION OF ACRYLIC ACID
Document Type and Number:
Japanese Patent JP3957298
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing acrylic acid by using a solution containing high concentration acrylic acid without performing an azeotropic distillation.
SOLUTION: The production method comprises the processes for: bringing acrylic acid-containing gas introduced in a collection tower (30) into contact with an aqueous solution for collection to obtain an acrylic acid-containing aqueous solution; distilling the resulting solution without adding an azeotropic solvent thereto to obtain a crude acrylic acid as the bottom stream and/or side stream of a distillation column (40); and melting and crystallizing the above crude acid by feeding into a crystallization apparatus (50) to obtain a refined acrylic acid. Accordingly, the production process is simplified because of the elimination of azeotropic distillation, and further the highly concentrated acrylic acid-containing solution is obtained by reducing loss of the subject acid to enable the production in a high yield.
Inventors:
Kouji Ueno
Haruki Hirao
Naoki Serada
Takeshi Yokogoya
Haruki Hirao
Naoki Serada
Takeshi Yokogoya
Application Number:
JP2003160772A
Publication Date:
August 15, 2007
Filing Date:
June 05, 2003
Export Citation:
Assignee:
Nippon Shokubai Co., Ltd.
International Classes:
C07C51/347; C07C51/43; C07C51/42; C07C51/44; C07C57/04; C07C57/07; (IPC1-7): C07C51/43; C07C57/07
Domestic Patent References:
| JP2001199931A | ||||
| JP50024942B1 | ||||
| JP5246941A | ||||
| JP2000273065A | ||||
| JP2003160530A | ||||
| JP9227445A |
Foreign References:
| WO2003043968A1 |
Attorney, Agent or Firm:
Mikio Hatta
Yasuo Nara
Katsuyuki Utani
Yasuo Nara
Katsuyuki Utani
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