Influencing factors of polarization coefficient of hollow fiber membrane

Abstract

Purpose The purpose of this study is to improve the performance of hollow fiber membrane and improve the separation efficiency. Design/methodology/approach By establishing a mathematical model of hollow fiber membrane gas separation, the influences of parameters such as pressure difference between the inside and outside of the filament, initial oxygen concentration of intake air, intake air flow rate and back pressure outside the filament on the polarization coefficient were analyzed, so as to explore the degree of influence of operating parameters on the concentration polarization, and put forward a technical scheme to reduce the concentration polarization. Findings Factors such as pressure difference between the inside and outside of the filament, initial oxygen concentration of intake air, intake air flow rate and back pressure outside the filament have a certain effect on the polarization coefficient. Among them, the polarization coefficient is positively correlated with pressure difference inside and outside the filament, initial oxygen concentration of intake air and back pressure outside the filament, and is negatively correlated with intake air flow. Practical implications Negative pressure suction on the permeation side can be used to increase the membrane permeation flow rate and reduce the concentration polarization. Originality/value The influence of concentration polarization on membrane performance is reduced by controlling various factors.