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Air containing 2 0 vol. % O 2 and 8 0 vol. % N 2 is separated by an O 2 - selective membrane and

Air containing $20$ vol. $% O 2$ and $80$ vol. $% N_{2}$ is separated by an $O_{2} -$ selective membrane and a

permeate gas stream containing $75$ vol. $% O_{2}$ is obtained. Calculate the $N_{2}$ rejection $R$ and the

separation factor $($ i $.$ e $.,$ separation selectivity $)_{O \frac{2}{N} 2} .$ Which of the two parameters is more

suitable for describing the performance?

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