摘要
制备了壳聚糖（ＣＳ）─羧甲基纤维素（ＣＭＣ）共混物膜（Ｉ－２），对其成膜反应、溶胀度、交联度及拉伸强度进行了研究，结果表明，壳聚糖与羧甲基纤维素共混物在成膜的同时还发生交联反应；当ＣＳ／ＣＭＣ＝１时，交联度最大，此时共混物膜不溶于稀醋酸水溶液．首次将此共混物膜用于乙醇／水混合液的分离，该膜具有优良的醇水分离性能，当ＣＳ／ＣＭＣ＝１时，渗透通量和分离因子皆达到最大值［Ｊ＝０．９ｋｇ／（ｍ~２·ｈ），ａ＝８００，９０ｗｔ％乙醇，４５℃］，且该膜的分离因子基本上不随温度变化，醇水透过Ｉ－２膜的表现活化能△Ｅ为３２．６ｋＪ／ｍｏｌ．对ＣＳ／ＣＭＣ＜ｌ的膜经碱土金属离子处理，渗透通量和分离因子均有提高，渗透通量按Ｍｇ^（２＋）＜Ｃａ^（２＋）＜Ｓｒ^（２＋）＜Ｂａ^（２＋）次序递增，分离因子变化次序则刚好相反。
The process of membrane formation of chitosan(CS)and carboxymethyl cellulose(CMC)was investigated.It was found that the CS/CMC membrane formation and the crosslinking reaction happened at the same time.The CS/CMC membranes were used for pervaporation separation of water-ethanol mixtures for the first time.The separation results showed that this membrane had better separation properties than other pervaporation membranes,e.g.,separation factor and permeation rate were 800 and 900 g/(m￣2·h),respectively,when CS/CMC=1.Separation properties were improved when the CS/CMC membranes were treated with alkaline earth cations and permeation rates increased as follows:Mg￣(2+)<Ca￣(2+)<Sr￣(2+)<Ba￣(2+),while separation factors showed an opposite tendeney.
出处
《高等学校化学学报》
CSCD
北大核心
1994年第7期1081-1084,共4页
Chemical Journal of Chinese Universities
基金
高等学校博士学科点专项科研基金
浙江省自然科学基金
关键词
壳聚糖
共混物膜
醇
水
分离
CS/CMC membrane
Pervaporation
Separation of water-ethanol mixture
