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Preparation and application of tube polydimethylsiloxane/ceramic inner composite membrane for pervaporation(PDF)


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Preparation and application of tube polydimethylsiloxane/ceramic inner composite membrane for pervaporation
DONG Mengyuan SHEN Jie LIU Gongping JIN Wanqin
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering,Nanjing Tech University,Nanjing 210009,China
tube PDMS/ceramic inner composite membrane dip-coating method pervaporation
Polydimethylsiloxane(PDMS)membrane was dip-coated in the inner surface of the tubular ceramic support. Scanning electron microscope(SEM)and pervaporation(PV)tests were utilized to investigate the effects of pore size of the ceramic support and coating time on the membrane morphology as well as the pervaporation separation performance. The operation parameters such as feed temperature and the feed concentration were investigated. Result showed that the composite membrane was complete uniform, and had a good transition. The composite membrane with larger pore diameters had higher permeation flux. With the coating time extending, the flux decreased and the separation factor increased. With the increase of alcohol content, the flux increased gradually and the separation factor decreased after increasing firstly. With the increase of operating temperature, the flux and separation factor increased. At temperature of 40 ℃, the as-prepared PDMS/ceramic composite membrane showed high separation performance with total flux of 1 050 g/(m2·h)and separation factor of 30, and the membrane was stable during 180 h long-term operation tests.


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Last Update: 2017-05-31