Study of pervaporation for dehydration of caprolactam through PVA/nano silica composite membranes

被引：29

作者：

Lin, Wenhai ^{[1
]}

Zhu, Tianrong ^{[1
]}

Li, Qin ^{[1
]}

Yi, Shengping ^{[1
]}

Li, Yang ^{[1
]}

机构：

[1] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China

来源：

DESALINATION | 2012年 / 285卷

关键词：

Nano silica; Composite membranes; epsilon-Caprolactam; Pervaporation; Dehydration; CROSS-LINKED PVA; CHITOSAN MEMBRANES; ZEOLITE; PURIFICATION; PERFORMANCE; PERMEATION; SEPARATION; ALCOHOL; SYSTEMS; ACID;

D O I：

10.1016/j.desal.2011.09.028

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

We investigated nano silica/PVA composite membranes to propose an improved caprolactam pervaporation (PV) dehydration process. The membranes were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy. X-ray diffraction, and contact angle measurement. Compared with the pure PVA membranes, the nano silica/PVA composite membranes showed different surface morphologies with enhanced hydrophilicity because of their unique formation. To evaluate PV performance and mechanism, we assessed the permeation flux, separation factor, diffusivity/sorptivity selectivity, and activation energy of the composite membranes. The evaluated results indicate that the nano silica/PVA composite membranes induced a breakthrough in the dehydration of a caprolactam-water mixture with a maximum flux of 3.8 kg m(-2) h(-1) and an acceptable separation factor of 150. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：39 / 45

页数：7

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