Laboratory tests of a membrane for H 2 CH 4 separation gave a permeate composition of 80 percent H 2 and a residue of 42 percent H 2 when the feed had 50 percent H 2 and the feed and permeate absolute pressures were 100 and 15 lb in 2 The permeate flow was 20 percent of the feed flow (a) What is th...

To solve this problem we can use the permeation equation and the concept of selectivity for membrane ...

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

Question:

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 lb_ƒ/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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