Using recovery and purity specifications.A feed, F, of 100 kmol/h of air containing 21 mol% O2 and 79 mol%N2 is to be partially separated by a membrane unit according to each of four sets of specifications. Compute the amounts, in kmol/h, and compositions, in mol%, of the two products (retentate, R, and permeate,P). The membrane is more permeable to O2.Case 1: 50% recovery of O2 to the permeate and 87.5% recovery ofN2 to the retentate.Case 2: 50% recovery of O2 to the permeate and 50 mol% purity ofO2 in the permeate.Case 3: 85 mol% purity of N2 in the retentate and 50 mol% purity ofO2 in the permeate.Case 4: 85 mol% purity of N2 in the retentate and a split ratio of O2in the permeate to the retentate equal to 1.1.

The basis of calculation for all the cases is taken as 100 kmol/h of air fed to the membrane…

Answered: Using recovery and purity…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

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Using recovery and purity specifications.
A feed, F, of 100 kmol/h of air containing 21 mol% O₂ and 79 mol%N₂ is to be partially separated by a membrane unit according to each of four sets of specifications. Compute the amounts, in kmol/h, and compositions, in mol%, of the two products (retentate, R, and permeate,P). The membrane is more permeable to O₂.
Case 1: 50% recovery of O₂ to the permeate and 87.5% recovery of
N₂to the retentate.
Case 2: 50% recovery of O₂ to the permeate and 50 mol% purity of
O₂ in the permeate.
Case 3: 85 mol% purity of N₂ in the retentate and 50 mol% purity of
O₂ in the permeate.
Case 4: 85 mol% purity of N₂ in the retentate and a split ratio of O₂
in the permeate to the retentate equal to 1.1.

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