Research on the mechanism of membrane fouling in recovering TS-1 molecular sieve using ceramic membrane
The mechanism of membrane fouling in recovering TS-1molecular sieves in the production of cyclohexanone oxime was studied. The effect of silica sol and TS-1 molecular sieve respectively and the combination function of them, as well as the three different silica sources of this system was investigated in the article. The degree of polymerization of silica in the feed was analyzed by inductively coupled plasma spectrometry (ICP) and ultraviolet spectrophotometry (UV). And the change of size of polymer silica and size of TS-1 molecular sieve particles were also studied. The results show that the combination function of silica and TS-1 particles was much strong than them respectively. Compared with the deionized water and 50 mg/l silica sol solution environment, the silica concentration of the ammonia water environment was much higher and the flux decline was the most remarkable too. Meanwhile the silica aggregated much in the ammonia water environment, and the size range of the silica polymer became larger with time. All of these led to dense layer forming and pore plugging easily. Furthermore the size of the TS-1 particle became smaller because of the dissolution of ammonia water. According to the K-C equation, cake layer resistance forming by particles of smaller size is bigger than the particles of bigger size, and particles with smaller size would enter the membrane pores and lead to pore plugging easily than bigger ones.
TS-1 molecular sieve ceramic membrane membrane fouling silica
Xin Liu Zhaoxiang Zhong Weihong Xing
Membrane Science and Technology Research Center, State key laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, 210009, Jiangsu, China
国际会议
The 5th International Conference on Separation Science and Technology(第五届国际分离科学与技术会议)
北京
英文
2007-10-14（万方平台首次上网日期，不代表论文的发表时间）