疏水SiO_2/PTFPMS杂化复合膜的制备及其气体分离性能  

Preparation and gas separation performance of hydrophobic SiO_2/PTFPMS hybrid composite membrane

作　　者：聂飞[1] 贺高红[1] 赵薇[2] 鞠佳[1] 李皓[1] 

机构地区：[1]大连理工大学化工学院,辽宁大连116024 [2]沈阳化工大学石油化工学院,辽宁辽阳111003

出　　处：《化工学报》2014年第8期3019-3025,共7页CIESC Journal

基　　金：国家杰出青年科学基金项目(21125628);国家高技术研究发展计划项目(2012AA03A611)~~

摘　　要：为了提高气体分离膜的耐溶胀特性,以多孔聚醚酰亚胺(PEI)为支撑层,采用溶液共混法制备了疏水SiO2/PTFPMS杂化复合膜,研究了疏水SiO2质量共混比对膜形态、耐溶胀性以及不同操作压差下的纯气渗透分离性能的影响。光学显微照片显示,当共混比不超过0.018时,杂化膜的透明度较高,表明疏水SiO2与PTFPMS具有较好的相容性;当SiO2与PTFPMS的共混比超过0.018时,SiO2团聚明显。SEM表征结果显示,杂化膜表面光洁,断面杂化涂层紧密贴合支撑层。疏水SiO2/PTFPMS杂化膜在异辛烷中的溶胀度为0,在乙酸乙酯中的溶胀度比PTFPMS均质膜的下降了11.9%,显示了其优异的耐溶胀性能。在操作压力为1.0 MPa,操作温度为25℃下,SiO2共混比为0.012时,疏水SiO2/PTFPMS杂化复合膜的CO2渗透通量达到最高156.1GPU,CO2/N2选择性为15.86。To improve the solvent resistance property of gas separation membrane, a hydrophobic SiO2/polytrifluoropropylsiloxane （PTFPMS） hybrid composite membrane was fabricated on a porous polyetherimide （PEI） support with solution blending method. The effects of mass ratio of hydrophobic SiO2 to PTFPMS on the membrane morphology, solvent resistance, and gas separation performance of the hydrophobic SiO2/PTFPMS hybrid composite membrane were investigated. The optical microscope images show good miscibility between SiO2 and PTFPMS with the increase of blend ratio till 0.018. At blend ratios higher than 0.018, SiO2 particles exhibit obvious aggregation in the hybrid membrane. SEM images show that no obvious defect is on the surface of the SiO2/PTFPMS selective layer that is closely stuck on the PEI support. The swelling degree of the hydrophobic SiO2/PTFPMS hybrid homogeneous film is 0 in nonpolar solvent octane and is declined by 11.9%in polar solvent ethyl acetate compared with PTFPMS homogeneous film, indicating the improved solvent resistance of the SiO2/PTFPMS hybrid homogeneous film. The CO2 gas permeation rate can reach as high as 156.1 GPU and the selectivity of CO2/N2 is 15.86 when the blend ratio of SiO2 is 0.012 under the transmembrane pressure difference up to 1.0 MPa.

关 键 词：PTFPMS 气体分离 膜 复合材料 二氧化硅 

分 类 号：TQ028.8[化学工程]