Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (5): 787-791.doi: 10.1007/s40242-015-5172-5

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Highly Selective Gas-phase Synthesis of 1,1-Dichloroethylene from 1,1,2-Trichloroethane over Supported Amine Catalysts

TANG Cen1, JIN Yanxia1, WANG Xiaoxia1, HU Gengshen1, XIE Guanqun1,2, LI Xiaonian2, LUO Mengfei1   

  1. 1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua 321004, P. R. China;
    2. Industrial Catalysis Institute of Zhejiang University of Technology, Hangzhou 310014, P. R. China
  • Received:2015-04-28 Revised:2015-06-01 Online:2015-10-01 Published:2015-09-08
  • Contact: XIE Guanqun, E-mail: gqxie@zjnu.edu.cn; LUO Mengfei, E-mail: mengfeiluo@zjnu.cn E-mail:gqxie@zjnu.edu.cn;mengfeiluo@zjnu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.NSFC-21476207), and the Open Research Fund of Top Key Discipline of Chemistry in Zhejiang Provincial Colleges(Zhejiang Normal University), China(No.ZJHX201413).

Abstract:

The manufacture of 1,1-dichloroethylene(1,1-DCE) usually employs liquid phase method to perform the dehydrochlorination of 1,1,2-trichloroethane(TCE), where large amounts of high-concentration salty wastewater is produced inevitably. It has been a long-term goal to achieve the gas phase synthesis of 1,1-DCE via supported catalysts. In this work, the gas-phase synthesis of 1,1-DCE from TCE was studied in the presence of pentaethylenehexamine(PEHA) supported on silica. High and stable selectivity to 1,1-DCE(up to 98%) was obtained, which could be ascribed to the relatively strong basicity of PEHA according to a proposed E2 mechanism. The formation of PEHA chloride from the HCl generated in situ was detected and was considered to be the main reason for the deactivation of PEHA catalyst.

Key words: 1,1-Dichloroethene, Supported amine catalyst, Dehydrochlorination