文献类型：期刊文献

中文题名：PVA-TEOS／PAN渗透汽化膜的制备及其乙酸乙酯脱水

英文题名：Preparation of PVA-TEOS/PAN Composite Membrane and Its Application in Pervaporation Separation of Ethyl Acetate-Water Solution

作者：袁海宽[1];许振良[1];马晓华[1];魏永明[1];齐峻[1,2];曾义红[1,2]

机构：[1]华东理工大学化学工程研究所膜科学与工程研发中心,上海200237;[2]上海吴泾化工有限公司,上海200241

年份：2008

卷号：8

期号：5

起止页码：872

中文期刊名：过程工程学报

外文期刊名：The Chinese Journal of Process Engineering

收录：CSTPCD;;EI(收录号：20084711718512);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：国家“十一五”科技支撑计划重大基金资助项目(编号:2006BAE02A01);上海华谊(集团)公司-华东理工大学先进化学与化工技术研究中心基金资助项目(编号:A200-8608)

语种：中文

中文关键词：聚乙烯醇;正硅酸乙酯;溶胶-凝胶法;渗透汽化;乙酸乙酯-水溶液

外文关键词：polyvinyl alcohol; tetraethoxysilane; sol-gel reaction; pervaporation; ethyl acetate-water solution

摘要：以聚丙烯腈(PAN)中空纤维超滤膜为底膜,以聚乙烯醇(PVA)和正硅酸乙酯(TEOS)的混合液为涂膜液,采用溶胶-凝胶法制备了PVA-TEOS/PAN渗透汽化复合膜,并用于乙酸乙酯脱水.FT-IR和XRD谱图证实复合膜表层中由于PVA与TEOS的交联反应而形成了Si-O-C共价键,且PVA的结晶度下降.另外,利用静态接触角测量对复合膜表层的亲水性进行了表征.考察了复合膜在乙酸乙酯水溶液中的溶胀性能及涂膜液中TEOS含量和料液温度与浓度对PVA-TEOS/PAN复合膜分离性能的影响.结果表明,TEOS的加入有效降低了复合膜在乙酸乙酯水溶液中的溶胀度,使其对水具有较好的分离选择性.40℃下,涂膜液中TEOS质量含量分别为5%和30%的PVA-TEOS/PAN复合膜分离98%的乙酸乙酯水溶液时,其分离因子分别为2830和4448,渗透通量分别为49.4和41.4g/(m2·h).
The composite membrane of polyvinyl alcohol （PVA）-tetraethoxysilane （TEOS）/polyacrylonitrile （PAN） （PVA-TEOS/PAN） was prepared by sol-gel reaction of mixtures of PVA and TEOS for pervaporation separation of ethyl acetate-water solution, where the support layer was PAN hollow fiber ultrafiltration membrane. FT-IR spectra and XRD patterns proved that the covalent bond Si-O-C formed and the crystallinity of PVA descended in the top layer of PVA-TEOS/PAN composite membrane of the cross-linking reaction between PVA and TEOS, respectively. In addition, the hydrophilicity of composite membrane was characterized by static contact angle for methylene iodide. The swelling degree of composite membrane in ethyl acetate aqueous solution, and the effects of TEOS concentration in coating solution, feed temperature and concentration on pervaporation performance of PVA-TEOS/PAN composite membrane for ethyl acetate-water solution were investigated. The results showed that the swelling of PVA in the solution was inhibited with addition of TEOS, leading to PVA-TEOS/PAN composite membrane with good dehydration performance. For PVA-TEOS/PAN composite membranes with 5% and 30% TEOS, their pervaporation performance of 98% ethyl acetate aqueous solution were evaluated as follows： the separation factors were 2830 and 4448, and their permeation fluxes 49.4 and 41.4 g/（m^2·h） at 40℃, respectively.