US 7,321,060 B2
Method for production of acrylic acid
Naoki Serata, Himeji (Japan); Kouji Ueno, Himeji (Japan); Harunori Hirao, Himeji (Japan); and Takeshi Yokogoshiya, Himeji (Japan)
Assigned to Nippon Shokubai Co., Ltd., Osaka (Japan)
Filed on Jun. 02, 2004, as Appl. No. 10/858,974.
Claims priority of application No. 2003-160770 (JP), filed on Jun. 05, 2003.
Prior Publication US 2004/0249200 A1, Dec. 09, 2004
Int. Cl. C07C 51/42 (2006.01); C07C 51/16 (2006.01)
U.S. Cl. 562—600  [562/532; 562/545] 7 Claims
OG exemplary drawing
 
1. A method for producing acrylic acid by a procedure comprising a step of subjecting propylene and/or acrolein to the reaction of catalytic gas phase oxidation thereby obtaining an acrylic acid-containing gas and a step of absorbing said acrylic acid-containing gas with an absorbing aqueous solution and obtaining an acrylic acid-containing solution, wherein a low boiling substance-containing solution (excluding water as a low boiling substance) is introduced into an acrylic acid absorption column at a site of a number of theoretical plates of not less than the amount of the number of theoretical plate of the absorption column times 0.5 as counted from the top of the column.