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

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2.7 Simultaneous Multicomponent Convergence

If the feed rate F, the feed composition consisting of (C – 1) zi values, the flash drum pressure pdrum, and the feed temperature TF are specified, the hot liquid will vaporize when its pressure is dropped. This “flashing” cools the liquid to provide energy to vaporize some of the liquid. The result Tdrum is unknown; thus, we must use a simultaneous solution procedure. First, we choose a feed pressure such that the feed will be liquid. Then we can calculate the feed enthalpy in the same way as Eqs. (2-47) and (2-48):

Image

(2-50)

Although the mass and energy balances, equilibrium relations, and stoichiometric ...

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