二丙酮丙烯酰胺共聚物膜用于渗透汽化法分离乙醇-水混合物

SEPARATION OF ETHANOL-WATER MIXTURE BY PERVAPORATION THROUGH DIACETONE ACRYLAMIDE COPOLYMERS

为将稀薄的乙醇水溶液浓缩,传统的蒸馏方法不能避免乙醇-水的共沸,能耗也很大。渗透汽化法克服了蒸馏法的这两个缺点,有希望成为分离乙醇水溶液的较为理想的方法。 作为水优先透过膜材料,有聚乙烯醇、磺化聚苯乙烯、聚丙烯腈、醋酸纤维素、聚乙烯亚胺、阴、阳离子交换膜阴、阳离子性多糖类。

Copolymersd of diacetone acrylamide (DAAM)-styrene (St) and DAAM-methylmethacrylate (MMA)were used as pervaporation membrane materials for ethanol-water mixture separation.The results showed that a better permselectivity for water was obtained when the content of St or MMA in copolymers was high. And with increase of DAAM content in copolymer the permeation rate increased significantly.The pervaporation behavior is explained in terms of preferential sorption of water in copolymer membranes. Sorption plays an important role in all pervaporation process.