膜科学与技术

SiO2填充PEBAX/PAN复合膜渗透汽化分离水中多元有机物

作者：刘琨，程静静，陈革新，付夏娜

单位：广西大学广西石化资源加工及过程强化技术重点实验室, 南宁 530004 义乌市中科院兰州化物所功能材料中心，义乌 322000

关键词：聚醚共聚酰胺(PEBAX)；渗透汽化；有机物

出版年,卷(期):页码： 2016,36(5):24-30

摘要：

以纳米SiO2（n- SiO2）为填充颗粒制备的PEBAX填充型复合膜对乙醇/水、丁酮/水、异丙醇/水及四元混合体系分别进行了渗透汽化分离研究。FTIR、SEM分别表征了膜的结构及内部样貌。结果表明：颗粒填充是物理混合，且其在膜内分散均匀。未填充复合膜对二元体系渗透通量和分离因子大小依次为丁酮>异丙醇>乙醇。随着n- SiO2填充量的增加，渗透通量和分离因子均先增大后减小，在填充量为0.12 wt%及一定的二元体系、四元体系浓度时，各体系渗透汽化分离效果最好。不同温度下，PS-12膜的分离因子最大分别为乙醇5.11、丁酮39.4、异丙醇6.08、混合物3.22（富集因子），渗透通量最大分别为5.49 kg/m2•h、8.85 kg/m2•h、9.52 kg/m2•h、11.4 kg/m2•h。

Polyether block amide (PEBAX) membranes filled with nano silica were prepared for pervaporative removal of ethanol, butanone, isopropyl alcohol (IPA) from water. The structure and internal morphology of the membranes were characterized by FTIR and XRD, respectively. The experimental results display that the filler is only physically blended with the polymer matrix and dispersed uniformly in the membrane. The permeation flux and separation factor of the unfilled composite membranes as follow: butanone > IPA> ethanol. The total flux and separation factor both increased first and then decreased with n- SiO2 increased. When nano silica filler content is 0.12 wt% and certain concentrations, the separation has the best results. The maximum separation factor of ethanol, butanone, IPA, mixtures were 5.11, 39.4, 6.08, 3.22 (enrichnment factor) respectively, and the total flux were 5.49 kg•m-2•h-1, 8.85 kg•m-2•h-1, 9.52 kg•m-2•h-1, 11.4 kg•m-2•h-1 with the composite membrane of PS-12 in different temperature.

第一作者简介：刘琨（1962—），女，广西南宁，博士，教授，广西大学化学化工学院博士生导师，主要从事膜分离研究。*通讯作者，E-mail：kunliuuw@gxu.edu.cn

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