摘要
研究了藻朊酸钠均质膜对有机液／水混合体系的渗透汽化特性。结果表明，藻朊酸钠对甲醇、乙醇、异丙醇、丙酮、四氢呋喃及二氧六环等有机溶剂同水的混合液均表现为水优先透过，其渗透通量及选择分离系数都非常高。对８０ｗｔ％的四氢呋喃水溶液，５５℃下，通量Ｑ达到２４８９ｇ／ｍ２·ｈ，水对四氢呋喃的分离系数趋于无穷大；对８０ｗｔ％的二氧六环水溶液，Ｑ为２８６２ｇ／ｍ２·ｈ，分离系数为３９９９６（６０℃）。通量与温度间呈Ａｒｒｈｅｎｉｕｓ关系。比较了两种藻朊酸钠样品对有机液／水混合体系的渗透汽化特性，讨论了化学组成、结构的不同，对膜性能的影响。
The sodium alginate dense membrane was investigated. This membrane prefe-rentially permeated water from the aqueous methanol, ethanol iso-propanol, acetone, dioxane and tetrahydrafuran solutions by pervaporation.The values of permeate flux and separation factor for organic solvent/water systemswere very high. For example, the permeate flux was 2489 g/m 2.h, and separation factor → ∞ at 55℃(for THF concentration in feed was 80 wt.%),the permeate flux was 2862 g/m 2·h and separation factor was 39996 at 60℃ (for dioxane concentration in feed was 80 wt.%). The permeate flux varied with the temperature in according with an Arrhenius type relationship,while comparing two kinds of sodium alginate samples. It was observed that the chemical structure of the membrane played an important role in determining the phenomena of pervaporation.
出处
《功能高分子学报》
CAS
CSCD
1996年第2期157-164,共8页
Journal of Functional Polymers
基金
国家自然科学基金资助项目
关键词
藻朊酸钠
膜分离
渗透汽化特性
有机溶剂
水
Sodium alginate, Dense membrane, Aqueous organic solvent, Pervaporation
