Separation of Air Components by Countercurrent and Co-Current Gas Permeation
Separation of Air Components by Countercurrent and Co-Current Gas Permeation
This Demonstration studies enriching the oxygen content of air with a single-stage membrane module. This problem was first treated in [1] and later in [2 and 3]. The binary mixture, (oxygen) and (nitrogen), has an ideal separation factor , the ratio of the permeabilities of the two species. The permeability of oxygen is =500×(STP)cmscmHg). The membrane is more permeable to oxygen and has a thickness . The stage cut, , is set by the user. The values of the pressures in the feed and permeate sides are chosen equal to cmHg and cmHg, respectively, which give a ratio of pressures, , equal to 10. The feed rate and composition are given by =(STP)/s, =0.791, and =0.209. This Demonstration computes the reject and permeate compositions as well as the membrane area for the countercurrent and co-current flow cases..
A
B
α=10
P
A
-10
10
3
cm
2
cm
t=2.54cm
-3
10
θ
Ph=190
Pl=19
r
q
f
6
10
3
cm
x
nitorgen
x
oxygen