用动态响应曲线法研究脉冲筛板萃取柱的传质特性

STIMULUS - RESPONSE METHOD FOR STUDY ON MASS TRANSFER CHARACTERISTICS IN PULSED SIEVE PLATE EXTRACTION COLUMN

用动态响应曲线法研究了内径150mm脉冲筛板萃取柱的传质特性,并考虑了轴向混合。实验体系采用30％TBP(煤油)-硝酸-水,操作条件:脉冲频率:1.0～2.5s^(-1),脉冲振幅=0.0067～0.030m,有机相/水相=1/1～3.3/1.实验结果表明,本法与稳态浓度剖面法同样可靠,且省时、省料,可在更宽流比范围内用于大柱径萃取设备的研究。

A stimulus - response method by using feed stream as tracer is used to study axial mixing and mass transfer characteristics in pulsed sieve plate extraction column of 15cm in diameter. The 'true' height of transfer unit and the axial mixing coefficients evaluated by this method are in good agreement with those. evaluated by the conventional steady - state concentration profiles method. The present method is suitable for research work in large experimental columns. It is much simpler in operation, much less in time and material consumption. Furthermore a greater operation range, e. g. flow ratio (org. /aq. ),could be used in experiments with the present method.