Enriching Oxygen in Air by Cross-Flow Membrane Permeation
Prepared by H. Binous and A. Bellagi
This Demonstration studies enriching the oxygen content of air with a single-stage membrane module. This problem was first treated in [1] and later in [2]. The binary mixture, A (oxygen) and B (nitrogen), has an ideal separation factor, the ratio of the permeabilities of the two species, α* = 10. The permeability of oxygen is PA = 500 x 10-10 cm3 (STP)cm/(s cm2 cmHg). The membrane is more permeable to oxygen and has a thickness t = 2.54 x 10-3 cm. The stage cut, θ, is set by the user. The values of the pressures in the feed and permeate sides are chosen equal to Ph = 190 cmHg and P1 = 19 cmHg, respectively, which give a ratio of pressures, r, equal to 10. The feed rate and composition are given by: qf = 106 cm3 (STP)/s, xnitrogen = 0.791 and xoxygen = 0.209. This Demonstration computes the reject and permeate compositions as well as the membrane area. In addition, values of the local permeate compositions, both at the entrance and exit of the module, are given.

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