发明名称 |
METHOD FOR PRODUCING XYLYLENEDIAMINE |
摘要 |
Provided is a method for stably and economically producing xylylenediamine with a high yield and long catalyst service life by hydrogenating dicyanobenzene that is obtained by ammoxidating xylene. By bringing an aqueous basic solution into contact with a dicyanobenzene-absorbed liquid, which is obtained by bringing an ammoxidation reaction gas into contact with an organic solvent, under specified temperature conditions, and subjecting a base and a carboxylic acid in the dicyanobenzene-absorbed liquid to a neutralization reaction so as to form an aqueous phase that contains a water-soluble salt, and then subjecting an organic phase and the aqueous phase to liquid-liquid separation so as to remove the aqueous phase, it is possible to remove the carboxylic acid contained in the dicyanobenzene-absorbed liquid with high selectivity while inhibiting loss of the dicyanobenzene. By subjecting the raw material dicyanobenzene, which is obtained by separating low boiling point compounds from the post liquid-liquid separation organic phase by distillation under reduced pressure, to hydrogenation, xylylenediamine is produced with a high yield and the service life of the hydrogenation catalyst is extended. |
申请公布号 |
EP2671864(B1) |
申请公布日期 |
2017.03.15 |
申请号 |
EP20120741506 |
申请日期 |
2012.01.30 |
申请人 |
Mitsubishi Gas Chemical Company, Inc. |
发明人 |
KUMANO, Tatsuyuki;IBI, Yukiya;ARASUNA, Kuniaki;NAGAO, Shinichi |
分类号 |
C07C209/48;B01J27/198;C07B61/00;C07C211/27 |
主分类号 |
C07C209/48 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|