Pervaporation and Vapor Permeation Membrane Systems for ...
Pervaporation and Vapor Permeation Membrane Systems for ...
Pervaporation and Vapor Permeation Membrane Systems for ...
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Pervap Per<strong>for</strong>mance Measures (2 of 2)<br />
• Permeance (P i ) → pressure-normalized flux<br />
P<br />
i<br />
=<br />
(<br />
sat<br />
)<br />
p γ x − p y<br />
i<br />
i<br />
i<br />
J<br />
i<br />
Perm<br />
γ = activity coeff., p sat = sat’d vapor pressure, p Perm = permeate pressure<br />
i<br />
[=] kg/m 2 •s•kPa<br />
• Permeability (П i ) = P i × membrane thickness<br />
• Selectivity (α)<br />
⎛Π<br />
⎞ ⎡P<br />
α = ⎜<br />
1<br />
⎟ =<br />
1<br />
12<br />
⎝ Π ⎠ ⎢⎣ P<br />
2<br />
2<br />
⎤<br />
⎥⎦
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