摘要
用渗透汽化膜分离混合液体,纤维素、赛璐玢等作醇/水分离膜有较高的渗透通量,但分离系数低.甲壳素是广泛存在于自然界的一类天然高分子.前文报道了用甲壳素脱乙酰基的产物壳聚糖(CS)作醇/水渗透汽化(PV)分离膜,在一定的原料液浓度下具有较好的选择渗透性.本文讨论CS膜结构对乙醇/水混合液PV性能的影响,并探讨了提高选择性的途径.
The present paper covers the deacetylation degree and crystallinity of chitosan membrane, the effect of the feed composition and temperature on the permselectivity of ethanol/water mixtures permeated through the chitosan membrane. The results indicate that the permselectivity of the chitosan membrane is mainly affected by the free volume in the membrane. Both high separation factor and flux were observed when the chitosan membrane was neutralized with sulphuric acid. This behavior should be attributed to the hydrophilicity of the membrane and the ap-propritate free volume in the membrane caused by ion-crosslinking.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第3期415-417,共3页
Chemical Journal of Chinese Universities
基金
中国石化总公司发展部资助
关键词
壳聚糖
膜分离
乙醇
渗透汽化
水
Chitosan, Pervaporation, Membrane separation, Ethanol/water mixture
