Enrichment of natural gas by polymeric membranes is an innovative technique. The membrane separation process versus conventional chemical absorption methods has proved to be energy efficient with a high selectivity. This study concerns mathematical modelling and analysis of factors which affect the membrane separation process. The model simulates the separation of a ternary gas mixture of CH4, C02 and N, by cellulose acetate membrane. Factors considered in the analysis include, the flow configuration, the gas law. the permeability function, and other operating and design parameters, e.g., feed pressure, flow rate, feed composition, and membrane area. The flow configurations considered in the analysis are the complete mixing and plug flow patterns. Also, two gas laws are used to determine the partial pressures of gaseous species, these are, the ideal gas law and the ideal solution assumption. In addition, separation behavior using either constant gaseous permeabilities or permeability functions which are pressure and composition dependent are included in the analysis.
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Ettouney et al. (1995) studied this question.
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