Mathematical Modeling and Investigation on the Temperature and Pressure Dependency of Permeation and Membrane Separation Performance for Natural gas Treatment

Abstract

Due to special features, modules comprising asymmetric hollow fiber membranes are widely used in various industrial gas separation processes. Accordingly, numerous mathematical models have been proposed for predicting and analyzing the performance. However, majority of the proposed models for this purpose assume that membrane permeance remains constant upon changes in temperature and pressure. In this study, a mathematical model is proposed by taking into account non-ideal effects including changes in pressure and temperature in both sides of hollow fibers, concentration polarization and Joule-Thomson effects. Finite element method is employed to solve the governing equations and model is validated using experimental data. The effect of temperature and pressure dependency of permeance and separation performance of hollow fiber membrane modules is investigated in the case of CO2/CH4. The effect of temperature and pressure dependence of membrane permeance is studied by using type Arrhenius type and partial immobilization equations to understand which form of the equations fits experimental data best. Findings reveal that the prediction of membrane performance for CO2/CH4 separation is highly related to pressure and temperature; the models considering temperature and pressure dependence of membrane permeance match experimental data with higher accuracy. Also, results suggest that partial immobilization model represents a better prediction to the experimental data than Arrhenius type equation.

Permeability of gas mixtures in glassy polymers with and without plasticization

“…For removal carbon dioxide (CO2), glassy polymeric membranes are often preferred over rubbery polymeric membranes because of their higher CO2/CH4 or CO2/N2 selectivity. [1][2][3][4][5][6] Although some types of glassy membranes have a good performance in CO2 separation, the performance of these membranes can be hindered by plasticization phenomenon. [7][8][9][10][11][12] Therefore, CO2 permeability increases with the feed pressure.…”

Fabrication, tuning and optimization of poly (acrilonitryle) nanofiltration membranes for effective nickel and chromium removal from electroplating wastewater

“…Some of the disadvantage and limitations of these methods are needing addition of chemicals, production of sludge, difficulty in reusing extracted heavy metal and high costs among others [5,6,9,10]. On the other hand, since their evolution, membrane separation processes have offered advantages such as low energy consumption, continuous operation, modular design, high efficiency, minimal labor requirements, selective removal of pollutants, low cost, physical separation of contaminants as well as easy operations and maintenance [11][12][13][14][15][16][17][18][19][20][21]. Accordingly, application of membranes for effective treatment of electroplating wastewater has attracted many researchers and membranologists.…”