制备了以聚偏氟乙烯(PVDF)微滤膜为底膜的加成型硅橡胶聚二甲基硅氧烷(PDMS)复合膜,用于渗透汽化分离乙醇/水体系。通过改变膜液的固含量和配比研究了复合膜的成膜性,采用扫描电镜(SEM)表征了复合膜的形貌结构,测定了交联PDMS均质膜的平均交联链长度、凝胶含量、溶胀度和溶解选择性,考察了配比和操作温度对复合膜渗透汽化性能的影响。结果表明:当含氢硅油中氢与乙烯基硅油中乙烯基的摩尔比为2∶1时,操作温度为50℃,料液浓度为10%(质量分数)时,复合膜的分离因子最高为8.9,渗透通量为124g/(m2·h)。
The addition silicon composite membranes supported by polyvinylidene fluoride (PVDF) porous microfiltration membranes were prepared and applied for ethanol recovery from ethanol/water system by pervaporation.The film-forming property of membranes was regulated by changing reaction conditions such as the H: vinyl molar ratio and solid content of membrane solution,and the morphology of PDMS/PVDF composite membranes were characterized by SEM.The average crosslinking chain length,gel content,swelling degree and selective sorption selectivity of PDMS homogeneous membranes were measured and the effect of molar ratio and the operation temperature on pervaporation of membranes were studied.It was found that when the molar ratio of H∶vinyl was 2∶1,with operation temperature of 50℃ and 10wt% ethanol feed concentration,the separation factor of membrane reached the maximum value of 8.9 with total flux of 124g/(m2·h).
[1]徐又一,徐志康.高分子膜材料[M].北京:化学工业出版社,2005,375-376.
[2]Liu G,Hung W,Shen J,et al.Mixed matrix membranes with molecular-interaction-driven tunable free volumes for efficient bio-fuel recovery[J].J Mater Chem,2015,8(3):4510-4521.
[3]展侠,李继定,黄军其,等.渗透气化优先透醇分离膜[J].化学进展,2008,20(9):1416-1426.
[4]王蕾,李继定,韩小龙.双组分加成型硅橡胶膜制备及其渗透汽化分离碳酸二甲酯/甲醇[J].化工进展,2009,28(Z):134-137.
[5]刘吉辉.POSS/PDMS复合膜的制备及其渗透汽化性能研究[D].北京:北京工商大学,2015.
[6]Zimmermann I.Development of a long-acting therapeutic system:part Ⅰ:a method to produce silicon rubbers with well-defined microstructures[J].European Journal of Pharmaceutics & Biopharmaceutics,2005,59(1):217-228.
[7]章坚,叶全明.乙烯基含量对加成型硅橡胶性能的影响[J].有机硅材料,2008,22(5):286-289.
[8]Wei W,Xia S S,Liu G P,et al.Effects of polydimethylsiloxane (PDMS) molecular weight on performance of PDMS/ceramic composite membranes[J].J Membr Sci,2011,375(1-2):334-344.
[9]Zhan X,Li J,Fan C,et al.Pervaporation separation of ethanol/water mixtures with chlorosilane modified silicalite-1/PDMS hybrid membranes[J].Chinese Journal of Polymer Science,2010,28(4):625-635.
[10]Liu J,Chen J,Zhan X,et al.Preparation and characterization of ZSM-5/PDMS hybrid pervaporation membranes:laboratory results and pilot-scale performance[J].Sep Purif Technol,2015,150:257-267.
[11]展侠.硅橡胶渗透汽化膜的制备及其优先透醇性能研究[D].北京:清华大学,2009.
[12]樊铖,展侠,李继定.Flory-Rehner理论关联相互作用参数及其应用[C].北京:膜科学与技术编辑部第四届中国膜科学与技术报告会论文集,2010.
[13]Hong H,Chen L,Zhang Q,et al.The structure and pervaporation properties for acetic acid/water of polydimethylsiloxane hybrid membranes[J].Mater Design,2012,34:732-738.
基金资助
国家自然科学基金(21736001、21776153和21576150);北京市自然科学基金(2132010)
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