ガス分離膜モジュールにおける混合拡散の影響

概要

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A calculation model based on longitudinal dispersion was presented for designing and analyzing gas separation membrane module operated at high stage cut. The model was verified by experiments. Two small modules were fabricated using polyimide hollow fiber membranes. The one was used for separating a 40.5% CO2-59.5% N2 mixture fed into outer side of the hollow fiber, and another was used for separating a 94.3% N2-5.7% SF6 mixture fed into bore side of the hollow fiber. Separation tests were carried out by evacuating permeate side, accordingly experimental results agreed fairly well with the cross plug flow model without operations at high stage-cut. The longitudinal dispersion model, in which mutual diffusion coefficients were used as dispersion coefficients, could reproduce the whole experiments including high stage-cut operation. The model provides useful and powerful method to design and analyze the module for concentrating dilute components in the retentate stream.