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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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17.3.3 Multicomponent Permeation in Perfectly Mixed Systems

In the previous section we saw that the RT curve took the place of the equilibrium curve in binary flash distillation. For multicomponent flash distillation the y-x equilibrium curve is replaced by equilibrium expressions of the form yi = Ki xi and the combination of the operating equations and equilibrium are summed using Σxi = 1, Σyi = 1, or Σyi − Σxi = 0. Since the operating equations for well-mixed permeators are similar to the operating equations for flash distillation (Hoffman, 2003), if we can write the rate expression in the form yi = Km,i xi, then the mathematics to solve the permeation problem will be very similar to that used for flash distillation. Of course, Km,i has a totally ...

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