公开(公告)号：US09822062B2

公开(公告)日：2017-11-21

申请号：US15025812

申请日：2015-03-09

Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.

Inventor： Yukiya Ibi ,  Tatsuyuki Kumano ,  Natsumi Wakita

IPC: C07C209/48 ,  C07C211/00 ,  C07C253/34 ,  C07C253/28 ,  B01D53/14 ,  B01D11/04 ,  B01D17/02 ,  B01D19/00 ,  B01D1/00 ,  B01D3/14

CPC classification number: C07C209/48 ,  B01D1/0082 ,  B01D3/14 ,  B01D11/0492 ,  B01D17/0214 ,  B01D19/00 ,  B01D53/1418 ,  B01D53/1493 ,  B01D2252/2053 ,  C07C253/24 ,  C07C253/28 ,  C07C253/34 ,  C07C255/51 ,  C07C211/27

Abstract: The object is to prevent deterioration and loss of dicyanobenzene in producing dicyanobenzene by ammoxidation of xylene to thereby achieve industrial and economical advantage in producing of dicyanobenzene. The method for producing dicyanobenzene of the present invention includes: contacting a xylene-ammoxidation reaction gas containing dicyanobenzene in ammoxidation of xylene with an organic solvent so as to obtain a dicyanobenzene-absorbing solution; contacting the dicyanobenzene-absorbing solution with a basic aqueous solution containing a salt such as ammonium carbonate so as to extract a water-soluble salt formed by neutralization reaction between carboxylic acid in the dicyanobenzene-absorbing solution and a base in the basic aqueous solution into an aqueous phase; separating the mixture of the dicyanobenzene-absorbing solution and the basic aqueous solution into an organic phase and an aqueous phase; decomposing the salt such as ammonium carbonate contained in the organic phase for separation of the salt from the organic phase; and distilling the organic phase to separate low boiling point compounds contained in the organic phase from the organic phase so as to obtain dicyanobenzene.