Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Patent
1996-11-25
1998-02-03
Burn, Brian M.
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C07C20972
Patent
active
057146357
ABSTRACT:
The present invention is related to a method for preparation of cyclohexylamine by hydrogenating aniline at a temperature of 150.degree. to 250.degree. C. under a hydrogen pressure of 1 to 20 atm in the presence of a catalyst selected from a chromium- or thorium- modified cobalt boride, wherein the amount of said modified cobalt boride is at least 0.6 wt % based on the weight of aniline.
Compared with the prior art which used a conventional hydrogenation catalyst such as ruthenium, palladium, Raney cobalt or Raney nickel, the method adopted by the present invention has the advantages in that it can be performed under a relatively lower hydrogen pressure without necessity of adding any coupling inhibitors and a much higher aniline conversion and a higher or comparable selectivity to cyclohexylamine can be obtained, thus resulting in greatly increased yield of cyclohexylamine.
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Chen I-Hui
Chen Yin-Zu
Yang Zhang-Feng
Burn Brian M.
San Fu Chemical Co., Ltd.
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