Razmjoo - Chemical Engineering Department, Sahand University of Technology
Babaluo - aResearch Center for Polymeric Materials, Sahand University of Technology
Bayati - Chemical Engineering Department, Sahand University of Technology

Analytical gas-permeation models for predicting the separation process across the membranes (exit compositions and area requirement) constitutes an important and necessary step in understanding the overall performance of the membrane modules. But, the exact (numerical) solution methods suffer from the complexity of the solution. Therefore, solutions of the nonlinear ordinary differential equations that govern the performance of the membrane modules for gas separations by approximate and asymptotic methods are useful in the design and comparison of processes. In this work, the asymptotic methods were applied for predicting the performance of the nanometric tubular ceramic membranes in the separation of binary gas mixtures. Also, the exact (numerical) solutions of the governing equations using the fourth order Rung-Kutta technique were proposed. The comparison of the results showed a good agreement between the exact solution and asymptotic analysis methods over the whole range of selectivities 0

Nanometric Membrane, Binary Mixture, Gas Separation, Asymptotic Analysis