| 用于TS-1催化剂回收的陶瓷膜污染机理 |
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| 引用本文： | 仲兆祥,李冬燕,刘馨,邢卫红,徐南平.用于TS-1催化剂回收的陶瓷膜污染机理[J].中国化学工程学报,2009,17(1):53-57. |
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| 作者姓名： | 仲兆祥 李冬燕 刘馨 邢卫红 徐南平 |
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| 作者单位： | 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 |
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| 基金项目： | 国家重点基础研究发展规划(973计划)，国家自然科学基金，江苏省自然科学基金，the National Science Foundation for Postdoctoral Scientists of China，江苏省博士后基金 |
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| 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.
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| 关 键 词： | TS-1 catalyst ceramic membrane membrane fouling |
| 收稿时间： | 2008-9-3 |
| 修稿时间： | 2008-9-3
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The Fouling Mechanism of Ceramic Membranes Used for Recovering TS-1 Catalysts |
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| ZHONG Zhaoxiang,LI Dongyan,LIU Xin,XING Weihong,XU Nanping.The Fouling Mechanism of Ceramic Membranes Used for Recovering TS-1 Catalysts[J].Chinese Journal of Chemical Engineering,2009,17(1):53-57. |
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| Authors: | ZHONG Zhaoxiang LI Dongyan LIU Xin XING Weihong XU Nanping |
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| Affiliation: | 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 |
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| 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 cata-lyst. 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. |
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| Keywords: | TS-1 catalyst ceramic membrane membrane fouling |
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