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

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5.4 Bubble-Point and Dew-Point Equilibrium Calculations

Although convenient mathematically, few systems have constant or almost constant relative volatilities. In this case we need to do a complete equilibrium calculation on each stage. If the distillation has HNKs, HK, and LK, we should step off stages from the bottom up and do a bubble-point calculation on each stage. The bubble-point temperature is the temperature of stage j at which the liquid mixture on the stage begins to boil. The pressure, pj, and the mole fractions of the liquid, xi,j, will be known. We wish to find the temperature, Tj, at which Σ yi,j = 1.0, where the yi,j are calculated as yi,j = Ki,j(Tj)xi,j. Stepping off stages down the column (HK, LK, and LNKs present), we use ...

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