下压式多段混合搅拌槽的实验研究

AN EXPERIMENTAL STUDY OF DOWN-PRESS STIRRING-TANK WITH MULTI-MIXER

用饱和NaCl溶液作示踪剂,计算机动态数据采集,研究了0.65L下压式多段混合搅拌槽(DPSTMM)流通截面放大25倍、体积放大100倍后轴向扩散、混合时间准数以及单位体积能耗等的变化。对放大后的DPSTMM,在煤油/辛醇(体积比10:1)-醋酸-水体系中,应用串级萃取原理分析了实验测定的总效率,计算出了不同混合段数时的总传质系数K_(od)α。结果表明DPSTMM具有良好的流体力学性能和传质性能。

The down-press stirring tank with multi-mixer (DPSTMM), a new type of mixing tank, was developed, which consists of several mixing chambers in a vertical series. The fluid flows down from chamber to chamber in 0. 65 liter and 65 liter DPSTMM. The number of mixing time Nθm was obtained, the energy consumption per unit mass was measured and the axial mixing coefficients were determined by computer from the response curve of tracer concentration. Experiments were carried out in 65 L DPSTMM, with kerosene/oc-tanol (10 : 1,V/V) as continuous phase and water as dispersed phase. HAc transfers from water to kerosene/octanol. The overall coefficient of mass transfer, Koda, in different mixing chambers was calculated by means of cascade extraction principles to analyse the overall efficiency of scaled - up DPSTMM. The experimental results showed that DPSTMM had much better performance than continuous stirring reactor tank (CSRT) in hydrodynamics and mass transfer.