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 y_{i} = K_{i} x_{i} and the combination of the operating equations and equilibrium are summed using Σx_{i} = 1, Σy_{i} = 1, or Σy_{i} − Σx_{i} = 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 y_{i} = K_{m,i} x_{i}, then the mathematics to solve the permeation problem will be very similar to that used for flash distillation. Of course, K_{m,i} has a totally ...

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