Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (11): 63-65,80.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Catalytic Hydrogenation of PDA to Prepare CHDA

Liu Qing-lin1  Su Cheng-yan1  Jia Li-shan1  Fang Wei-pin1  Li Qing-biao1   

  1. 1. Dept. of Chemical and Biochemical Engineering，Xiamen Univ. , Xiamen 361005 ， Fujian， China;2. Dept. of Chemistry，Xiamen Univ. , Xiamen 361005 ， Fujian，China
  • Received:2007-01-23 Online:2007-11-25 Published:2007-11-25
  • Contact: 刘庆林(1965-) ，男，教授，博士生导师，主要从事多相反应动力学研究. E-mail:qlliu@xmu.edu.cn
  • About author:刘庆林(1965-) ，男，教授，博士生导师，主要从事多相反应动力学研究.
  • Supported by:

    国家"973" 计划项目(2004CB217805)

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Abstract:

1 ,4-diaminocyclohexane (CHDA) has trans-and cis-ismoers. 在lis paper deals with the process of catalytic hydrogenation of 1 ，4-phenylenediamine (PDA) to prepare trans-CHDA in the presence of catalyst Ru/C , analyzes the influences of reaction temperature and pressure , as well as the catalyst prepar硝on and dosagr on the hydrogenation , and preliminarily explores the reuse of the catalyst. The results show that the activation at a high temperature and the ba阳modificatÎon of the catalyst can greatly enhance the catalytic property and ohviously improve the yield of trans-CHDA. In the optimal conditions , that is , a catalyst-activated temperature of 500℃，a hase modification of 5 % Ru/C, a reaction temperature of 140 ℃ and a pressure of 8 MPa, the conversion rate of PDA approaches 100% , the yield of CHDA reaches over 90% and the trans-to-cis rate of CHDA approximates 80: 20.

Key words: 1, 4-phenylenediamine, 1 , 4-diaminocyclohexane, catalytic hydrogenation