30%TBP-煤油/HNO_3体系在折流板脉冲萃取柱中的水力学性能

Hydrodynamics Characteristics of 30%TBP-Kerosene/Nitric Acid Solution in Discs and Doughnuts Pulsed Extraction Column

在100 mm折流板脉冲萃取柱中实验考察了30%TBP-煤油1 mol/L HNO3体系下的萃取柱操作参数(脉冲振幅、脉冲频率、流速和流比)、结构参数(板间距)对萃取柱水力学性能(液泛通量、液泛存留分数和正常操作时分散相存留分数)的影响。实验研究结果表明:液泛通量随脉冲强度的减小而增大,与流比和板间距无关,研究给出了液泛通量与脉冲强度间的关联式;操作参数和柱结构参数对液泛存留分数的影响均可忽略;正常操作时分散相存留分数与连续相的流速、流比成正比关系,而与脉冲频率无关,并随板间距和脉冲振幅的增大而增加。

The effects of the pulsed amplitude, pulsed frequency, flow velocity and flow ratio and the plate spacing on the hydrodynamics characteristics, such as flooding throughout, flooding-holdup and holdup were studied for 30% TBP-kerosene/HNO3 solution in a 100 mm-diameter discs and doughnuts pulsed extraction column. Experimental results show that flooding throughout increases with the decreasing of pulsation intensity and is independent of flow ratio and plate spacing; the effects of operation parameter and plate spacing on flooding-holdup can be neglected; the holdup is in proportion to the flow rate of the continuous phase and the flow ratio, and increases with the increasing of pulsed amplitude and plate spacing. Based on the presented data, empirical correlations for flooding throughout and the holdup are given.