SCI和EI收录∣中国化工学会会刊

›› 2009, Vol. 17 ›› Issue (1): 53-57.

• SEPARATION SCIENCE AND ENGINEERING • Previous Articles     Next Articles

The Fouling Mechanism of Ceramic Membranes Used for Recovering TS-1 Catalysts

ZHONG Zhaoxiang1, LI Dongyan2, LIU Xin1, XING Weihong1, XU Nanping1   

  1. 1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China;
    2. Chemical Engineering Department, Nanjing College of Chemical Technology, Nanjing 210048, China
  • Received:2008-09-03 Revised:2008-10-27 Online:2009-01-28 Published:2009-01-28
  • Supported by:
    Supported by the National Basic Research Program of China (2009CB623406);the National Natural Science Foundation of China(20806038);the Natural Science Foundation of Jiangsu Province (BK2008504);the National Science Foundation for Postdoctoral Scientists of China (20070421005);Jiangsu Planned Projects for Postdoctoral Research Funds (0702020B)

The Fouling Mechanism of Ceramic Membranes Used for Recovering TS-1 Catalysts

仲兆祥1, 李冬燕2, 刘馨1, 邢卫红1, 徐南平1   

  1. 1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China;
    2. Chemical Engineering Department, Nanjing College of Chemical Technology, Nanjing 210048, China
  • 通讯作者: XING Weihong, E-mail: xingwh@njut.edu.cn
  • 基金资助:
    Supported by the National Basic Research Program of China (2009CB623406);the National Natural Science Foundation of China(20806038);the Natural Science Foundation of Jiangsu Province (BK2008504);the National Science Foundation for Postdoctoral Scientists of China (20070421005);Jiangsu Planned Projects for Postdoctoral Research Funds (0702020B)

Abstract: Ceramic ultrafiltration membranes were used to separate titanium silicalite-1(TS-1) catalysts from the slurry of catalytic ammoximation of cyclohexanone to oxime.Silica was shown to have a great effect on membrane fouling in the alkaline environment of this system.In the ammoximation system, there are three main silica sources, which are residual silica on the catalyst particles surface during preparation, silica dissolved from TS-1 catalyst particles by ammonia solvent, and silica sol added into the reaction slurry to inhibit the dissolution erosion of the TS-1 catalyst.The silica dissolved by ammonia has been proved to influence membrane fouling most among the three silica sources.This was because the amount of silica dissolved by ammonia was the largest, and the polymerization of silica monomers at high concentration caused colloid particles formation, which led to a dense cake layer depositing on the membrane surface.Meanwhile, the size reduction of catalyst particles caused by alkaline dissolution also increased specific resistances of cake layers.

Key words: TS-1 catalyst, ceramic membrane, membrane fouling

摘要: Ceramic ultrafiltration membranes were used to separate titanium silicalite-1(TS-1) catalysts from the slurry of catalytic ammoximation of cyclohexanone to oxime.Silica was shown to have a great effect on membrane fouling in the alkaline environment of this system.In the ammoximation system,there are three main silica sources,which are residual silica on the catalyst particles surface during preparation,silica dissolved from TS-1 catalyst particles by ammonia solvent,and silica sol added into the reaction slurry to inhibit the dissolution erosion of the TS-1 catalyst.The silica dissolved by ammonia has been proved to influence membrane fouling most among the three silica sources.This was because the amount of silica dissolved by ammonia was the largest,and the polymerization of silica monomers at high concentration caused colloid particles formation,which led to a dense cake layer depositing on the membrane surface.Meanwhile,the size reduction of catalyst particles caused by alkaline dissolution also increased specific resistances of cake layers.

关键词: TS-1 catalyst, ceramic membrane, membrane fouling