首页|Hyperbranched polymer hollow-fiber-composite membranes for pervaporation separation of aromatic/aliphatic hydrocarbon mixtures
Hyperbranched polymer hollow-fiber-composite membranes for pervaporation separation of aromatic/aliphatic hydrocarbon mixtures
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The separation of aromatic/aliphatic hydrocarbon mixtures is crucial in the petrochemical industry.Pervaporation is regarded as a promising approach for the separation of aromatic compounds from al-kanes.Developing membrane materials with efficient separation performance is still the main task since the membrane should provide chemical stability,high permeation flux,and selectivity.In this study,the hyperbranched polymer(HBP)was deposited on the outer surface of a polyvinylidene fluoride(PVDF)hollow-fiber ultrafiltration membrane by a facile dip-coating method.The dip-coating rate,HBP con-centration,and thermal cross-linking temperature were regulated to optimize the membrane structure.The obtained HBP/PVDF hollow-fiber-composite membrane had a good separation performance for ar-omatic/aliphatic hydrocarbon mixtures.For the 50％/50％(mass)toluene/n-heptane mixture,the permeation flux of optimized composite membranes could reach 1766 g·m-2·h-1,with a separation factor of 4.1 at 60 ℃.Therefore,the HBP/PVDF hollow-fiber-composite membrane has great application prospects in the pervaporation separation of aromatic/aliphatic hydrocarbon mixtures.
Tong Liu、Hao Sun、Xiangqiong Wang、Jie Li、Zhanquan Zhang、Pei Wu、Naixin Wang、Quanfu An
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Beijing Key Laboratory for Green Catalysis and Separation,Department of Chemical Engineering,College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China
Petrochemical Research Institute,CNPC,Beijing 102206,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaPetrochina
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