改性壳聚糖渗透蒸发膜分离叔丁醇-水

Separation of tert Butyl alcohol Water Mixtures on Modified Chitosan Composite Membrane

将壳聚糖与聚乙烯醇共混,用戊二醛交联制备了高选择性、高通量的改性壳聚糖渗透蒸发复合膜.考察了制膜工艺、操作温度、进料组成等对叔丁醇-水体系分离性能的影响,与聚乙烯醇/聚丙烯腈复合膜进行了比较,发现改性壳聚糖复合膜的分离性能有大幅度的提高.在操作温度为343 K,进料液中叔丁醇的质量分数为80%～92%时,改性复合膜的分离因子最高达到3 500,渗透通量可达132 g/(m2·h).

By blending chitosan(CTS) with polyvinyl alcohol(PVA) and crosslinking them with glutaraldehyde, a modified chitosan pervaporation membrane with better selectivity and higher permeation flux was prepared. The effects of methodology of membrane formation, pervaporation temperature and the composition of feed solution on the separation performance for tert butyl alcohol(TBA) water mixtures were examined in com parison with the polyvinyl alcohol/polyacrylonitrile composite membranes. Experimental results show that the modified chitosan composite membrane displayed the best separation factor of 3 500 and the total flux was 132 g/(m 2 ·h) when the pervaporation temperature was 343 K and the amount of TBA in feed solution was in the range of 80% to 92%.