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

›› 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. 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. 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

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

ZHONG Zhaoxiang, LI Dongyan, LIU Xin, XING Weihong, XU Nanping. The Fouling Mechanism of Ceramic Membranes Used for Recovering TS-1 Catalysts[J]. , 2009, 17(1): 53-57.

仲兆祥, 李冬燕, 刘馨, 邢卫红, 徐南平. The Fouling Mechanism of Ceramic Membranes Used for Recovering TS-1 Catalysts[J]. , 2009, 17(1): 53-57.

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

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

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