研究了绿茶提取液的纳滤浓缩分离过程,采用两种操作方式:连续式浓缩和间歇式浓缩.在连续式浓缩实验中,通过测定不同操作压力下透过实验所得的通量、水脱除率和对茶多酚的截留率来分析纳滤过程的特点,在0.4～0.8 MPa下对茶多酚的平均截留率为97.3%.在间歇式浓缩实验中,测定了膜对不同茶水比浸取所得茶汤的截留性能,实验值与浓缩模型预测值进行了比较,实测值与模型值吻合较好,表明浓缩模型对于茶多酚的纳滤浓缩分离过程具有较好的适用性,可用于浓缩过程的设计计算.
参考文献
| [1] | 杨贤强;王岳飞;陈留记.茶多酚化学[M].上海:上海科学技术出版社,2003 |
| [2] | 李海波.茶多酚的应用与研究[J].食品研究与开发,2004(02):12-15. |
| [3] | 王晓琳,张澄洪,赵杰.纳滤膜的分离机理及其在食品和医药行业中的应用[J].膜科学与技术,2000(01):29-36. |
| [4] | Cassano A;Drioli E;Galavema G et al.Clarification and concentration of citrus and carrot juices by integrated membrane process[J].Journal of Food Engineering,2003,57:153-163. |
| [5] | J. Warczok;M. Ferrando;F. Lopez;C. Gueell .Concentration of apple and pear juices by nanofiltration at low pressures[J].Journal of Food Engineering,2004(1):63-70. |
| [6] | 华耀祖.超滤技术与应用[M].北京:化学工业出版社,2004:159-162. |
| [7] | Zeman L J;Zydney A L.Microfiltration and ultrafiltration:principles and applications[M].New York:Narcel Dekker,Inc,1996 |
| [8] | Regina M.B.Duarte;Eduarda B.H. Santos;Armando C. Duarte .Comparison between diafiltration and concentration operation modes for the determination of permeation coefficients of humic substances through ultrafiltration membranes[J].Analytica chimica acta,2001(1):155-164. |
| [9] | Van der Bruggen B.;Wilms D.;Vandecasteele C.;Schaep J. .Influence of molecular size, polarity and charge on the retention of organic molecules by nanofiltration[J].Journal of Membrane Science,1999(1):29-41. |
| [10] | 任建新.膜分离技术及其应用[M].北京:化学工业出版社,2003 |
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