摘要
制备了聚乙烯醇（ＰＶＡ）／聚丙烯睛（ＰＡＮ）渗透汽化复合膜，研究了交联剂用量、底膜结构、进料液组成、操作温度等因素对膜的渗透汽化性能的影响．发现ＰＶＡ／ＰＡＮ复合膜对水／醇混合液表现为水优先透过，进料液中乙醇浓度在６０～９９ｗｔ％的范围内，渗透通量Ｊｔ与温度之间符合Ａｒｒｈｅｎｉｕｓ关系，选择分离系数αＷ／Ｅ也随温度上升而增大．进料液为９５ｗｔ％的乙醇／水混合液时，７５℃下Ｊｔ高达３００～４５０ｇ／ｍ２ｈ，αＷ／Ｅ为８００～１１００．对异丙醇／水、异丁醇／水及甘油／水混合体系，复合膜显示出更为优秀的透过、分离性能．就膜的化学、物理结构与其渗透汽化性能间的关系进行了讨论．
Composite membranes with a poly (vinylalcohol) (PVA) layer coated on polyacrylonitrile(PAN) support membranes were evaluated for pervaporation separation of water-alcohol mixtures. The PVA /PAN composite membranes as prepared were water permselective for the ethanol concentration range of 60 to 99wt% in the feed, and the separation factors were 800 ￣ 1100, permeate flux was 300 ￣ 450g/m2hat 75℃ (for ethanol concentration in feed 95wt%). The dependence of the permeate flux on temperature was consistent with the Arrhenius relationship, and the separation factor and permeate flux was increased with increasing operation temperature.PVA /PAN composite membrane has excellent permselectivity for separating mixtures of iso-propanol (or iso-butyl alcohol, glycerin) and water.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1996年第2期210-215,共6页
Acta Polymerica Sinica
关键词
聚乙烯醇
复合膜
渗透汽化特性
聚丙烯腈
Polyvinylalcohol, Dense membrane, Composite membrane, Pervaporation characteristics
