渗透蒸发膜分离的实验研究

以多孔聚醚砜 (PES)超滤膜为支撑层 ,以戊二醛为交联剂制备亲水性聚乙烯醇 (PVA) /PES复合膜 ,分别在6 0、70、80℃下对不同浓度的乙二醇溶液进行渗透蒸发实验 ,并在不同温度下对PVA均质膜做了溶涨平衡实验 ,考察了操作参数对渗透蒸发膜分离性能的影响。结果表明 ,随着温度的升高 ,膜溶涨度增强 ,渗透通量增加 ,但对水的选择性有所降低。随着料液中乙二醇浓度的增大 ,膜溶涨度增强 ,并在某一浓度出现最大值 ,并对水的分离选择因子出现最小值。对于渗透通量 ,随着料液中乙二醇浓度的增大 ,乙二醇的分通量增加 ,水的分通量减小。

Study on Pervaporation Membrane Separation Process

Polyvinyl alcohol (PVA /PES )composite membranes were prepared with porous polyether sulfone (PES) ultrafiltration membrane as support layer and glutaraldehyde(GA)as corsslinking agent. At temperatures of 60 ℃, 70 ℃ and 80 ℃, pervaporation experiments using composite membrane to separate water from glycol aqueous solution and swelling balance experiments using PVA homomembrane were carried out. With increase in operating temperature, swelling degree increased, permeation flux increased, selectivity to water decreased. With glycol content in the feed increasing, swelling degree increased with a maximal value appearing at a certain glycol content, and at the same time, separation factor to water has a minimal value. With increase of glycol content in the feed, glycol permeation flux increased, and water permeation flux decreased.