The graphical solution of the design equations for a well mixed, gas permeation

Question

The graphical solution of the design equations for a well mixed, gas permeation membrane module separating CO_2 and methane is shown below (where various operating lines intersecting the transfer rate curve are shown in the figure). y_p is the permeate concentration of CO_2 while y_out is the outgoing stream concentration of CO_2. If 40% (molar basis) of the incoming feed (with 50 mol% CO_2 feed composition) is removed as the permeate stream, what is the mole fraction of CO_2 in the retentate stream? Use space given to show how you arrive at your final choice! (a) 0.10 (b) 0.88 (c) 0.50 (d) 0.25

Explanation / Answer

C is correct ansewer. because 50 mol% of CO2 is removiesd as permiate steam. the rtentate stem contain 50 mol% that means 0.50 mole Fraction of CO2.

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