ChE 150B Problem Set 13 Due November 25, 2009 Problem 1. (25 Points) Consider the commercial application of membrane separators discussed in Seader and Henley Chapter 14: Gas is fed to a membrane separator at 450 psia and 200 o F, with the following component flow rates in lbmol/h: H 2 1,872.3, CH 4 193.1, C 2 11.4, Benzene 4.8, Toluene 4.2, and p-Xylene 0.6. The membrane system has a total area of 16,000 ft 2 , with a thickness of 0.3 microns. The permeate exits at 50 psia with 1,685.1 lbmol/h of H 2 and 98.8 lbmol of CH 4 . The retentate exits at 450 psia. Calculate the permeabilities of hydrogen and methane in Barrer units. [Hint: You can estimate a driving force for mass transfer as the difference between the average partial pressure of the feed and retentate, minus the partial pressure of the permeate.] Problem 2. (35 Points) The separation of air into nitrogen and oxygen is widely practiced. Cryogenic distillation is most economical for processing 100 to 5,000 tons of air per day, while
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This note was uploaded on 01/13/2010 for the course CHEM 1 taught by Professor Pines during the Winter '08 term at Berkeley.