A porous glass membrane, with an average pore diameter of 40 is used to separate light
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A porous glass membrane, with an average pore diameter of 40 Å is used to separate light gases at
25C when Knudsen flow may be dominant. The pressures are 15 psia downstream and
not > 120 psia upstream. The membrane has been calibrated with pure helium gas, giving a constant
permeability of 117,000 Barrer. Experiments with pure CO2 give a permeability of 68,000 Barrer.
Assuming that helium is in Knudsen flow, predict the permeability of CO2. Is it in agreement with
the experimental value? If not suggest an explanation.
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