用聚电解质渗透汽化膜进行乙醇脱水  

Pervaporation Dehydration of Alcohol with Polyelectrolyte Membrane

作　　者：周志军[1] 陈欢林[1] 刘茉娥[1] 张颖[1] 

机构地区：[1]浙江大学材料与化工学院,杭州310027

出　　处：《高等学校化学学报》2001年第7期1213-1215,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金重点项目 (批准号 :2 9836 16 0

摘　　要：Polyelectrolytes have a high hydrophilicity and can be used in pervaporation(PV) dehydration of alcohol. Chitosan(CS) used as polycation polysaccharide and carboxymethyl cellulose(CMC) used as polyanion polysaccharide were chosen as PV membrane materials. CS membrane cross linked with oxalic acid or citric acid and CS CMC polyelectrolyte membrane were prepared. The results showed that the polyelectrolyte membranes had an excellent PV performance for alcohol dehydration. For example, when the separation factor gone up to 2 300, the total flux of CS CMC polyelectrolyte membrane was above 800 g/(m 2·h) in 95% EtOH and at 72 ℃. The nature and content of crosslinking agents affected the separation properties of cross linked CS membrane. The total flux of the cross linked CS membrane increased with operating temperature increasing and corresponded to the Arrhenius equation.Polyelectrolytes have a high hydrophilicity and can be used in pervaporation(PV) dehydration of alcohol. Chitosan(CS) used as polycation polysaccharide and carboxymethyl cellulose(CMC) used as polyanion polysaccharide were chosen as PV membrane materials. CS membrane cross linked with oxalic acid or citric acid and CS CMC polyelectrolyte membrane were prepared. The results showed that the polyelectrolyte membranes had an excellent PV performance for alcohol dehydration. For example, when the separation factor gone up to 2 300, the total flux of CS CMC polyelectrolyte membrane was above 800 g/(m 2·h) in 95% EtOH and at 72 ℃. The nature and content of crosslinking agents affected the separation properties of cross linked CS membrane. The total flux of the cross linked CS membrane increased with operating temperature increasing and corresponded to the Arrhenius equation.

关 键 词：聚电解质 渗透汽化膜 乙醇 脱水 膜分离 壳聚糖 羧甲基 纤维素制备 多元酸 

分 类 号：TQ028.8[化学工程] O623.411[理学—有机化学]