文献类型：期刊文献

英文题名：Preparation of modified MFI-type/PDMS composite membranes for the separation of dichlorobenzene isomers via pervaporation

作者：He, Qiu-Ping[1,2];Wang, Ying-Ying[2,3];Wang, Peng-Fei[2,3];Dou, Xiao-Ming[1]

机构：[1]East China Univ Sci & Technol, Sch Sci, Inst Photon & Biomed, Shanghai 200062, Peoples R China;[2]Shanghai Luqiang New Mat Co Ltd, Shanghai 200062, Peoples R China;[3]Shanghai Res Inst Chem Ind Co Ltd, State Key Lab Polyolefin Catalyt Technol & High P, Shanghai 200062, Peoples R China

年份：2022

卷号：12

期号：25

起止页码：16131

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20222512247998);WOS:【SCI-EXPANDED(收录号:WOS:000802922000001)】；

语种：英文

外文关键词：Ammonia - Coupling agents - Evaporation - Fluorine compounds - Isomers - Mixtures - Pervaporation - Plants (botany) - Polydimethylsiloxane - Pore size - Silica - Silicones - Zeolites

摘要：Zeolite-polymer composite membranes have become promising and effective materials for the pervaporative separation of liquids, especially for isomeric mixtures. In this paper, silicalite-1/PDMS composite membranes have been used to investigate the separation of dichlorobenzene (DCB) isomers via pervaporation for the first time. Silicalite-1 zeolites modified by the silane coupling agent, NH3-C3H6-Si(OC2H5)(3), have been incorporated into polydimethylsiloxane (PDMS). Then, the silicalite-1/PDMS composite membranes have been successfully prepared on porous polyvinylidene fluoride (PVDF) supports. The morphology and structure of the silicalite-1 zeolites and silicalite-1/PDMS composite membranes have been characterized by XRD, FTIR, SEM and BET techniques. The results show that the modified silicalite-1 zeolite particles have smaller pore sizes dispersed more uniformly in the active layers of the silicalite-1/PDMS composite membranes and present fewer aggregation and pinholes formed by the accumulation of zeolite particles. The silicalite-1/PDMS composite membranes are all dense and continuous with good homogeneity. To evaluate the pervaporative separation performance of the DCB isomers, the unmodified and modified silicalite-1/PDMS composite membranes have been further tested in single-isomer and binary-isomer systems at 60 degrees C. The modified silicalite-1/PDMS composite membranes present higher DCB isomer separation factors. The separation factors of the modified silicalite-1/PDMS composite membranes in the binary-isomer systems for p-/o-DCB and p-/m-DCB are 3.53 and 5.63, respectively. The permeate flux of p-DCB through the modified silicalite-1/PDMS composite membranes in the p-/o-DCB binary-isomer system is 116.7 g m(-2) h(-1) and in the p-/m-DCB binary-isomer system, it is 93.5 g m(-2) h(-1). The result provides a new approach towards the pervaporative separation of DCB isomers from their mixture for future industrialization applications.