Laboratory tests of a membrane for H 2 /CH 4 separation gave a permeate composition of 80

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Laboratory tests of a membrane for H2/CH4 separation gave a permeate composition of 80 percent H2 and a residue of 42 percent H2 when the feed had 50 percent H2 and the feed and permeate absolute pressures were 100 and 15 lbƒ/in.2 The permeate flow was 20 percent of the feed flow. 

(a) What is the membrane selectivity? 

(b) About what permeate composition would have been obtained if a vacuum had been used on the downstream side?

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Unit Operations Of Chemical Engineering

ISBN: 9780072848236

7th Edition

Authors: Warren McCabe, Julian Smith, Peter Harriott

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