PVA与PAN复合膜分离乙醇-水溶液的渗透汽化放大试验

The study of the separation of water ethanol mixture by pervaporation with PVA/PAN composite membranes

在渗透汽化放大试验装置上，针对乙醇水体系，考察了板框式膜组件的结构合理性和大面积复合膜的稳定性，研究了不同料液流量、料液浓度和料液温度对膜分离性能的影响。实验结果表明，大膜分离性能稳定，膜分离性能在料液流量为０２～０８０Ｌ／ｓ的范围内基本不变，并且总渗透通量及水通量的对数值与料液浓度、料液温度的倒数分别呈线性关系；超薄板框式膜组件设计合理，结构紧凑，有效地抑制了膜料液侧的浓差极化。

In the scale up pervaporation test of water ethanol solution, the rationality of the design of plate and frame module and the stability of the enlarged PVA/PAN composite membrane were studied. The influences of operational conditions were investigated respectively. The results showed that the separation property of enlarged membrane is stable, the separation property is constant during a large range of feed rate from 0.2L/s to 0.8L/s, and the nature logarithm of the total permeate flux is direct proportional to the feed ethanol concentration and the reciprocal of the absolute temperature respectively. The results also showed that the design of the membrane module is rational and can suppress concentration polarization in pervaporation, enabling the feed rate be in turbulence as Re over 3,000.