Model for Membrane Separation of a Gas Mixture

Permeate side Permeate Fp yj,p Permeate — Permeate side 

Feed side — Retentate Feed Feed side 

Mole Fraction Summation for Feed, Retentate and Permeate  

Rate Equations based on Membrane Permeance (Constitutive Relations)  

In the above equations, Ff, Fp and Fj. are molar flow rates of feed, permeate and retentate streams, respectively y f, y p and y are mole fractions of the component in the feed, permeate and retentate streams, respectively Pf and Pp are feed-side and permeate-side pressures, respectively A , is the membrane area and Q, is the permeance (= permeabil-ity/effective membrane thickness) of the i component through the membrane. Note that balance for component n is not included in Equation 4.2 to avoid redundant equations with Equation 4.1. 

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