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

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2.4.1 Sequential Solution Procedure

In the sequential solution procedure, we first solve the mass balance and equilibrium relationships, and then we solve the energy balance and enthalpy equations. In other words, the two sets of equations are uncoupled. The sequential solution procedure is applicable when the last degree of freedom is used to specify a variable that relates to the conditions in the flash drum. Possible choices are:

Vapor mole fraction, y

Liquid mole fraction, x

Fraction feed vaporized, f = V/F

Fraction feed remaining liquid, q = L/F

Temperature of flash drum, Tdrum

If one of the equilibrium conditions, y, x, or Tdrum, is specified, then the other two can be found from Eqs. (2-2a) and (2-2b) or from the graphical representation ...

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