Membrane Gas Separation

Dew Point (°F, 1 atm)
 Dr
y Gas F
low (SCFM)
Figure 16.7 Effect of sweep variation on dry gas fl ow rate as a function of dew point: 
solid – sweep variation = 0, short dash – sweep variation = 0.1, long dash – sweep 
variation = 0.2

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The Effect of Sweep Uniformity on Gas Dehydration Module Performance
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Dew Point (°F, 1 atm)
Dry Gas Recovery
Figure 16.8 Effect of sweep variation on dry gas recovery as a function of dew point: 
solid – sweep variation = 0, short dash – sweep variation = 0.1, long dash – sweep 
variation = 0.2
0
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Dew Point (°F, 1 atm)
 Dry Gas Flow (SCFM)
Figure 16.9 Effect of sweep and fi bre inner diameter variation on dry gas fl ow rate as a 
function of dew point: solid – no variation, short dash – sweep variation = 0.2, long dash 
 – inner diameter variation = 0.2

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346
Membrane Gas Separation
The effect of sweep variability in air dehydration is comparable to that observed previ-
ously for fi bre variability in nitrogen production from air [30,31] . Signifi cant changes in 
module performance are found only for inner diameter variability.
16.3.3
Effect of Sweep Distribution 
Explicit sweep distribution calculations were performed for three different confi gurations 
as illustrated in Figure 16.11 . The sweep is introduced either (1) on the periphery of the 
fi bre bundle adjacent to the tube sheet, (2) on the periphery offset partially from the tube 
sheet, or (3) internally from within fi bre bundle.
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