Effects of Operating Parameters on Direct Contact Membrane Distillation Concentration of Licorice Root, Honeysuckle, and Indigo Woad Root Aqueous Extracts

Yachun Ma; Longfeng Wu; Jie Fang; Lin Zhang; Chuanrun Li; Huchuan Wang

Abstract

With the rapid development of the traditional Chinese medicine industry, the concentration of the aqueous extract of traditional Chinese medicine has become an important research direction. Among them, the high concentration temperature of traditional Chinese medicine is prone to cause the loss of heat-sensitive components in Chinese medicine. Compared to conventional concentration methods, membrane distillation gives high purity concentrates under mild operating conditions. Therefore, the aim of this study was to evaluate the effects of feed temperature, hot-side flux, cold-side flux, cold-side temperature and different membrane pore sizes on the concentration of aqueous extracts of traditional Chinese medicine. In addition, the contamination of membranes in the MD process and the effect of chemical cleaning on the removal of the contamination were investigated. The results showed that it was feasible to concentrate the aqueous extract of traditional Chinese medicine by DCMD method. Chemical cleaning, especially alkali as a cleaning agent, is effective in removing the dirt layer.

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