Numerical Simulation Of Mass Transfer Of Copper Through Hollow Fiber Supported Liquid Membrane

As a new membrane technology, liquid membrane process has unique advantages, compared to the traditional extraction process. Its main features are:efficient separation, low energy consumption, lower operating cost. The liquid membrane process has been widespread in industrial applications. In recent years, with the new emerging membrane separation technologies, the researches on its mass transfer performance are more and more in-depth. They are mainly focused on the following aspects:the study of membrane material, the overall mass transfer performance of membrane devices and processes, the new membrane technology and its application in new areas. This research conducted on the hollow fiber supported liquid membrane mass transfer process.Many factors have impacts on the mass transfer in the hollow fiber membrane process. Most scholars used the semi-empirical model in the study of mass transfer. The total mass transfer resistance is the superposition of the material phase, membrane phase, and anti-extraction phase. This type of model has a good agreement with experiment data, but less applicability, because for different systems, the model has very different mass transfer process. For a better understanding of the mass transfer mechanism in the hollow fiber membrane process, it is necessary to conduct the study from the first principal.This thesis is the modeling study on the mass transfer behavior in the hollow fiber membrane process. By simplifying membrane wire configuration in the process, laminar flow is assumed to be fully developed. Then the mass transfer differential equations are established in cylindrical coordinates. The boundary conditions of partial differential equations are determined by the interface reaction kinetics.The Crank-Nicolson finite difference method is used to solve equations in Matlab environment. Concentration profiles via both axial and radial direction are obtained. In this thesis, the impacts of fluid flow rate, pH, hollow fiber diameter and the content of organic carrier on the mass transfer process are investigated. Simulation results show that:with the increasing flow rate, the outlet concentration will decrease, there is an optimal operating pH value, the effect of diameter changes within a certain range. The Happel free surface model is used in the study of the shell side. The mass transfer equations for the shell side is therefore established, and the performance of mass transfer in shell is discussed accordingly In this paper, a theoretical study of fiber membrane process is conducted, in which a number of impact factors are analyzed. It can be a theoretical reference to the membrane extraction process development and applications.