羟乙基纤维素/聚偏氟乙烯复合膜中支撑膜结构对渗透汽化脱硫性能的影响  

Effect of the structure of support layer of composite hydroxyethyl cellulose/polyvinylidene flouride membrane on desulfurization performance in pervaporation

作　　者：渠慧敏[1,2] 孔瑛[1,3] 张玉忠[3] 杨金荣[1] 史德青[1] 

机构地区：[1]中国石油大学(华东)重质油国家重点实验室,青岛266555 [2]中国石化集团胜利油田胜利采油工艺研究院,山东东营257000 [3]天津工业大学中空纤维膜材料与膜过程教育部重点实验室,天津300160

出　　处：《膜科学与技术》2010年第3期82-86,共5页Membrane Science and Technology

基　　金：教育部新世纪优秀人才支持计划(NCET)资助项目(NCET-06-0605);中国博士后科学基金项目(20070420119)

摘　　要：用涂布法制成羟乙基纤维素(HEC)/聚偏氟乙烯(PVDF)复合膜;考察PVDF支撑膜铸膜液中聚合物浓度对复合膜结构的影响,并用催化裂化汽油评价复合膜的渗透汽化脱硫性能.结果表明,支撑膜铸膜液聚合物浓度增加将降低支撑膜的孔径、孔隙率,使得汽油组分在支撑膜内的扩散系数和传质系数降低而甲基噻吩和辛烷的传质系数之比增加,导致HEC/PVDF复合膜渗透性降低,富集因子增加.若聚合物浓度过高,支撑膜致密层平均孔径过小,将发生汽油蒸汽局部冷凝,使膜富集因子降低而渗透性增加.The different composite hydroxyethyl cellulose （HEC）/ polyvinylidene fluoride （PVDF） membranes were prepared by coating method. The effect of the polymer content in casting solution on the structure of composite membranes was studied, the desulfurization performance of composite HEC membranes was tested using fluid catalytic cracking gasoline. The results show that the increasing of polymer concentration in the casting solution reduces the mean pore radius and porosity of support layer, and the diffusion and mass transfer coefficient of gasoline components in the support layer, but increases the ratio of the mass transfer coefficient between methyl-thiophene and octane. This would lead to a decrease in permeation of composite HEC membrane and an increase in selectivity. If polymer concentration further in- creases, the average pore radius is very small so to lead to a capillary condensation. Consequently, the membrane selectivity reduces and the permeation increases.

关 键 词：HEC复合膜 渗透汽化 支撑膜 汽油脱硫 传质 

分 类 号：TE621[石油与天然气工程—油气加工工程]