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利用多效膜蒸馏技术对中药提取液进行浓缩。考察了进料温度T1、料液加热温度T3和料液流量对膜通量和造水比的影响。结果显示T1升高时膜通量下降而造水比升高;T3升高时膜通量和造水比随之增加;料液流速增加会使膜通量增加,而造水比随之降低;随着浓缩的进行,膜通量和造水比逐渐降低。通过30 d连续操作,发现膜组件的操作性能保持稳定。说明使用多效膜蒸馏可将中药提取液浓缩16倍以上,操作温度为70℃时,膜通量可达3 L.m-2.h-1,造水比可达7。
The multi-effect membrane distillation technology is used to concentrate traditional Chinese medicine extract. The influence of feed temperature T1, feed heating temperature T3 and feed flow on membrane flux and water production ratio were investigated. The results showed that membrane flux decreased and water production ratio increased when T1 increased, membrane flux and water production ratio increased with the increase of T3, membrane flux increased and feed water ratio decreased ; As the concentration progressed, the membrane flux and water production ratio decreased gradually. After 30 days of continuous operation, it was found that the handling performance of the membrane module remained stable. The results showed that the multi-effect membrane distillation can concentrate the traditional Chinese medicine extract more than 16 times, and the membrane flux can reach 3 L.m-2.h-1 when the operating temperature is 70 ℃.