[12] Patent
[11] Patent No.:GC0009448  
[45] Date of Publishing the Grant of the Patent: 31/Dec /2018                56/2018  
Number of the Decision to Grant the Patent:2018/142095
Date of the Decision to Grant the Patent:23/Dec/2018

[21] Application No.:GC 2011-20116

[22] Filing Date:24/12/2011

[30] Priority:

[33] State [32] Priority date [31] Priority No.

[72] Inventor: Kazuhiko SANO

[73] Owner: Asahi Kasei Kabushiki Kaisha, 1-105 Kanda Jinbocho, Chiyoda-ku, Tokyo 101-8101, Japan

[74] Agent: Kadasa Law Firm




Int. Cl.7: B01D3/42; C07B61/00; C07C253/34; C07C255/08

[56] Cited Documents:

-JP 2010-222309 A (Asahi Kasei Chemicals Corp.) 07 October 2010
-JP 2010-241742 A (Dia-Nitrix Co., Ltd.) 28 October 2010
-JP 2002-518353 A (Solutia Inc.) 25 June 2002
-JP 2010-533578 A (Bahr, Frank) 28 October 2010
Examiner: Saja Mohammed AlHassan

[57] Abstract: A method for purifying acrylonitrile including a step of distilling a solution ‎containing acrylonitrile, hydrogen cyanide and water by using a distillation tower in ‎which a condenser is connected to a top of the distillation tower, further including a ‎step of maintaining a constant temperature of outlet fluid of the condenser.‎
No. of claims: 5     No. of figures: 3


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