Separation of Carbon Dioxide and Methane Using Well-Mixed Gas Permeation

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A mixture of carbon dioxide and methane are to be separated by a cellulose acetate membrane at 35 °C.


The permeability of carbon dioxide and methane are and , respectively. Thus, the selectivity, .

The high (retentate side) and low (permeate side) pressures are 20.0 and 1.1 atm, respectively.

The Demonstration plots (1) the RT curve, which relates mole fractions on both sides of the membrane, and (2) the operating line, whose slope depends on the stage cut, .

Assuming that both retentate and permeate sides are well mixed, the graphical solution of this gas permeation problem is given by the intersection point shown in cyan in the figure. You can set the value of the feed composition (i.e. mole fraction of ) as well as the stage cut.


Contributed by: Housam Binous and Ahmed Bellagi (March 2011)
King Fahd University of Petroleum & Minerals and École nationale d'ingénieurs de Monastir
Open content licensed under CC BY-NC-SA




[1] P. C. Wankat, Separation Process Engineering, 2nd ed., Upper Saddle River, NJ: Prentice Hall, 2007.

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