正渗透浓缩茶料液中茶多酚研究  

Concentration of tea polyphenols from tea solution by forward osmosis

作　　者：徐龙生[1,2] 刘启明[2] 张凯松[1] 

机构地区：[1]中国科学院城市环境研究所,厦门361021 [2]集美大学生物工程学院,厦门361021

出　　处：《膜科学与技术》2015年第3期92-97,共6页Membrane Science and Technology

基　　金：厦门市对台科技合作项目(3502Z20131159)

摘　　要：采用NaCl溶液作为驱动液,考察了不同的驱动液浓度、不同的膜材料对茶料液中茶多酚的浓缩效果,研究了正渗透过程中膜渗透性能(通量)、膜污染状况、膜清洗效果以及浓缩液中茶多酚的保留率.结果表明:正渗透浓缩茶多酚,以NaCl溶液为驱动液,可以获得较为稳定的通量,采用正渗透浓缩茶多酚具有一定的可行性;以PA-4M、CTA-4M、CTA-2.7M浓缩茶料液,在达到10倍的浓缩倍数时,对污染的膜用NaOH(pH=10)进行清洗25min,其通量恢复率分别为100%、95.9%、96.1%,浓缩液中茶多酚的保留率分别为70%、79.3%、83.8%;采用CTA膜以2.7mol/L NaCl溶液为驱动液进行浓缩较为合适.The effects of different draw solution concentration and different membrane materials for concentrating tea polyphenols from tea solution using NaC1 as draw solution were investigated. The filtration performance, membrane fouling, membrane cleaning and the retention rate of tea polyphenols in the concentrate were also investigated. The results showed that steady flux and concentrating effect were obtained using NaC1 as draw solution. PA-4M, CTA-4M and CTA-2.7M were used to concentrate the tea solution until the concentration ratio was up to 10 times. Then the fouled membranes were cleaned with NaOH （pH=10） for 25 rain. The flux recovery rate was 100%, 95. 9%, 96. 1%, and the retention rates, of tea polyphenols in the concentrate were 70%, 79. 3% and 83. 8%, respectively. The results showed that CTA membrane was more suitable for forward osmosis concentrating using 2.7 mol/L NaC1 as draw solution.

关 键 词：正渗透 驱动液 浓缩 茶多酚 膜污染 膜清洗 

分 类 号：TQ028.8[化学工程]