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通量性能、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2.7M NaCl溶液为驱动液进行浓缩较为合适。

The performance of different draw solution concentration and different membrane materials for concentrating tea polyphenols from tea solution using NaCl 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 concentrate effect were obtained using NaCl as draw solution. PA - 4 M, CTA - 4 M and CTA - 2.7 M were used to concentrate the tea solution until the concentration ratio was up to 10 times. Then the fouled membrane were cleaned with NaOH (PH=10) for 25 min. The flux recovery rate were 100%, 95.9%, 96.1%, and the retention rate of tea polyphenols in the concentrate were 70%, 79.3% and 83.8% respectively. The results showed that CTA membrane is more suitable for concentration using 2.7 M NaCl as draw solution.

[1] Vuong Q V, Golding J B, Nguyen M, et al.Extraction and isolation of catechins from tea[J].J Sep Sci,2010,33(21):3415-28.
[2] Heo H J, Kim Y J, Chung D, et al.Antioxidant capacitiesof individual and combined phenolics in amodel system[J].Food Chemistry,2007,104(1):87-92.
[3] 李淑娟.茶多酚的保健和药理作用研究进展[J].西北药学杂志,2010,25(1):78-79.
[4] Evans P J, Bird M R, Phihlajamaki A,et al.The influence of hydrophobicity, roughness and charge upon ultrafiltration membranes for black tea liquor clarification[J].Journal of Membrane Science,2008,313(1-2):250-262.
[5] Chandini S K, Rao L J, Subramanian R, et al.Membrane Clarification of Black Tea Extracts[J].Food andBioprocess Technology,2012:1-18.
[6] Rao L, Khizar Hayat, Yi Lv, et al.Effect of ultrafiltration and fining adsorbents on the clarification of green tea[J].Journal of Food Engineering,2011,102(4):321-326.
[7] 周义卉,高学龄,张斌,等.超滤膜澄清分离速溶茶副产品中茶多酚的研究[J].膜科学与技术,2012,32(1):102-105.
[8]肖文军,刘仲华,龚志华.茶叶深加工中膜法浓缩技术研究[J].膜科学与技术,2006,26(1):55-59.
[9] Negrão Murakami A N, de Mello Castanho Amboni R D, Prudencio E S, et al.Concentration of phenolic compounds in aqueous mate (Ilex paraguariensis A. St. Hil) extract through nanofiltration[J].LWT-Food Science and Technology,2011,44(10):2211-2216.
[10] 张远志,欧阳晓江,逯河元.反渗透膜浓缩绿茶汁的研究[J].食品科学,2004,25(6),127-129.
[11] 周为.有关超声波技术在绿茶汁反渗透膜浓缩制备工艺中的应用研究 [D].重庆:西南大学,2010.
[12] Ye Yong, Li Ming Yang, Xing Hai Ting. Technique of Instantaneous Ultrasonic Extraction and Reverse Osmosis Concentration on Polyphenols of Chinese Herbs[J]. Advanced Materials Research,2013,734:2226-2229.
[13] Mi B X, Elimelech M. Organic fouling of forward osmosis membranes: Fouling reversibility and cleaning without chemical reagents [J].Journal of Membrane Science,2010,348:337-345.
[14] Sant’Anna V, Marczak L D F, Tessaro I C. Membrane concentration of liquid foods by forward osmosis: Process and quality view [J]. Journal of Food Engineering, 2012,111(3):483-489.
[15] Su J, Zhang S, Ling M M, et al. Forward osmosis: an emerging technology for sustainable supply of clean water [J]. Clean Technologies and Environmental Policy,2012:1-5.
[16] Zhao S F, Zou L D. Effects of working temperature on separation performance, membrane scaling and cleaning in forward osmosis desalination [J]. Desalination, 2011,278(1-3):157-164.
[17] Wei J, Qiu C, Tang C Y, et al. Fane. Synthesis and characterization of flat-sheet thin film composite forward osmosis membranes [J].Journal of Membrane Science,2011,372(1):292-302.
[18] Ren J, McCutcheon J R. A new commercial thin film composite membrane for forward osmosis [J].Desalination,2013.
[19] Garcia-Castello, Esperanza M, McCutcheon J R. Dewatering press liquor derived from orange production by forward osmosis [J].Journal of Membrane Science,2011,372(1):97-101.
[20] Bellona, Christopher, Melissa Marts, et al. The effect of organic membrane fouling on the properties and rejection characteristics of nanofiltration membranes[J].Separation and Purification Technology.2010:74:44–54.
[21] Parida V, Ng H Y. Forward osmosis organic fouling: Effects of organic loading, calcium and membrane orientation [J].Desalination,2013,312:88-98.
[22] 张妙芬.茶叶中茶多酚含量测定方法的研究[J].化学工程与装备,2012,(5):152-155.
[23] Liu Y, Mi B. Combined fouling of forward osmosis membranes: Synergistic foulant interaction and direct observation of fouling layer formation [J].Journal of Membrane Science, 2012,407:136-144.
[24] Zou S, Gu Y, Xiao D, et al.The role of physical and chemical parameters on forward osmosis membrane fouling during algae separation [J]. Journal of Membrane Science, 2011,366(1–2):356-362.
[25] Gu Y, Wang Y N, Wei J, et al. Organic fouling of thin-film composite polyamide and cellulose triacetate forward osmosis membranes by oppositely charged macromolecules [J]. Water research,2013,47(5):1867-1874.