具有界面交联结构藻酸钠复合膜的制备与性能

报道了一种具有界面交联结构的新型藻酸钠复合膜及其对醇水和其它有机物水体系的渗透汽化分离性能.该膜的活性层为藻酸钠,支撑层为氨化聚丙烯腈(PAN)多孔膜,在这两层之间存在着界面交联结构.研究了PAN多孔膜的水解时间、进行氨基化的二元胺种类及浓度对复合膜分离性能的影响,用己二胺进行氨基化所得到的复合膜的分离性能明显优于用乙二胺的结果.扫描电镜照片显示水解及氨基化改变了PAN超滤膜的孔结构,这也是影响新型复合膜性能的一个重要原因.

Preparation and Separation Properties of Sodium Al ginate Composite Membrane with Interface Crosslinking

A novel organic dehydration membrane with interface crosslink structure consisting of aminated PAN microporous membrane as sublayer, sodium alginate coating as top layer and intermolecular crosslinking as middle layer has been prepared and characterized by pervaporation experiment. The influence of hydrolysis time of PAN microporous membrane, the kinds and concentration of diamine used for amination of the microporous support layer on selectivity and flux was studied and it was shown that the amination of the sublayer with 1,6-hexanediamine(HDM) gave higher pervaporation performance of the composite membrane than that with ethylenediamine (EDM). This novel composite membrane prepared from the support layer aminated by 20% HDM after being hydrolyzed for 2 h has a high separation factor of 2 241 and a good permeation rate of 305 g · m-2 · h-1 for pervaporation of 90% ethanol aqueous solution at 70 ℃, higher separation factors and fluxes for n-PrOH/water, i-PrOH/water,acetone/water and dioxane/water systems. The results show that the separation factor and flux of this membrane increase with raising the operating temperature. At the same time, SEM micrograps show that hydrolysis and amination of PAN microporous membrane change its pore structure. From the results it can be concluded that pore structure of the sublayer do make influence of the separation properties of the novel composite membrane.