中空纤维支撑体液膜分离锌离子的渗透模型研究

Modelling of the Separation of Zn^（2+）by Hollow Fiber Supported Liquid Membranes

本文阐明了渗透阻力模型,并利用它对实验结果作了理论分析。导出了描述低浓溶质一次性流过中空纤维管组件行为的方程式。提出在高流速下,料液浓度边界层厚度与料液流速的负二分之一次方成正比的假设。结果表明料液相扩散阻力和膜相扩散阻力是本系统的主要阻力。

The permeability resistance model and equations which describe the permeation resistance of Zn2+ through HFSLM(Hollow Fiber Supported Liquid Membranes)are presented. In this paper, the equations describing the behavior of HFSLM modules of once-through mode at low metal concentration was derived. It was proposed that the thickness of the aqueous boundary-la yer of metal concentration in the incompressible viscous parallel flow teed phase was directly proportional to minus one half power of average feed velocity. Results showed that this hypothesis was in good agreement with the data of experiments. The total resistance of mass transfer in this chemical system consists of the aqueous resistance of the boundary-layer of metal concentration in the feed phase and the organic resistance of the diffusion-layer ot the metal-complex concentration in the membrane phase.