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用磺化聚乙烯离子膜渗透汽化分离恒沸组成的i-PrOH/H_2O(87.2/12.8W/W),分离系数α高,渗透通量J低(小于300g/m~2·h,40℃),当醇含量高于90％时,膜性能变差;用CA膜、赛璐玢膜[2]、Nation-Na~+膜,J较高,α低(<30)。甲壳素脱乙酰基产物壳聚糖(Chitosan,简称CS),易交联改性,成膜性好。CS膜分离i-PrOH/H_2O,α很高,而J低。经戊二醛交联的CS膜尺寸稳定,增加了醇/水的J值,α虽有所下降,对i-PrOH/H_2O体系仍具有很高的值。为了进一步提高J值,我们研制了以聚丙烯腈(PAN)微孔膜作支撑的CS复合膜,
The i-PrOH / H 2 O (87.2 / 12.8W / W) was separated by pervaporation using a sulfonated polyethylene ion-permeable membrane. The separation factor α was high and the permeate flux J was low (less than 300g / m 2 · h at 40 ℃ ), When the alcohol content is higher than 90%, the membrane performance becomes worse; with CA membrane, cellophane [2], Nation-Na ~ + membrane, J is higher and α is lower (<30). Chitosan deacetylation product chitosan (Chitosan, referred to as CS), easily cross-linked modification, good film-forming. CS membrane separation i-PrOH / H_2O, α is high, and J is low. The CS membrane cross-linked by glutaraldehyde is dimensionally stable and increases the J value of the alcohol / water. Although α decreases, it still has a high value for the i-PrOH / H 2 O system. In order to further improve the J value, we developed a polyacrylonitrile (PAN) microporous membrane as a support for the CS composite membrane,