中药更年安浸取液汽液固三相流自然循环蒸发浓缩

引　言中药生产关键环节 (提取、分离、浓缩、纯化等 )的新技术示范工程研究是中药现代化的主要内容之一 ,国家许多部委也都将其列为“十五”中药现代化专项中的重要内容 ,这为化学工程领域的科研人员提供了用武之地1] .浓缩是中药制剂原料成型前处理的重要单元操作 ,沸腾蒸发

NATURAL CIRCULATING EVAPORATION OF LIQUID EXTRACT OF GENGNIAN'AN OF TRADITIONAL CHINESE MEDICINE WITH VAPOR-LIQUID-SOLID FLOW

Preliminary experimental studies on evaporation of Gengnian'an liquid extract of traditional Chinese medicine(TCM)with vapor-liquid-solid flow boiling technique were carried out in a transparent natual circulating three-phase evaporator. The height of the heating tube is 2.5 m with an inner diameter of 0.038 m and an outer diameter of 0.045 m. The cylindrical solid particles with a diameter of 0.0025 m and a length of 0.0025 m is made of a kind of inert material that does not interact with the liquid of Gengnian'an. The heat energy for the evaporator was supplied by the electric heating system. It was shown that the presence of the solid particles could enhance the process of heat transfer since the heat transfer coefficients in vapor-liquid-solid boiling system was about 1.5-2.0 times that of the vapor-liquid boiling system when the heat flux was constant. On the other hand,fouling prevention and a lower wall temperature were also seen when the solid particles were present. The quality of concentrated liquid of TCM would be improved.