Concentrating the extract of traditional Chinese medicine by direct contact membrane distillation

被引：43

作者：

Ding, Zhongwei ^{[1
]}

Liu, Liying ^{[1
]}

Yu, Hanfei ^{[1
]}

Ma, Runyu ^{[1
]}

Yang, Zurong ^{[1
]}

机构：

[1] Beijing Univ Chem Technol, Coll Chem Engn, Beijing 100029, Peoples R China

来源：

JOURNAL OF MEMBRANE SCIENCE | 2008年 / 310卷 / 1-2期

关键词：

direct contact membrane distillation; extract of traditional Chinese medicine; concentration; membrane fouling;

D O I：

10.1016/j.memsci.2007.11.036

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

This study applies direct contact membrane distillation (DCMD) to concentrating the extract of traditional Chinese medicine (TCM). The transmembrane flux under various operation conditions was measured in real-time during concentration process. By decoupling the factors affecting the trans-membrane flux decline, it was found that the observed flux decline throughout the process could be attributed to the membrane fouling, the reduction of water vapor pressure and the increase of transport resistance at feed side. Analysis of the combined factors was given to show in detail the mechanism of flux decline. Factors that may affect the flux level, such as feed velocity, feed temperature and pretreatment were experimentally examined. Gas bubbling or sparging was introduced into DCMD system for reducing membrane fouling, and it was found that both gas-liquid two-phase flow at the feed side and gas back-washing within membrane module are effective ways to control membrane fouling. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：539 / 549

页数：11

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