It is necessary to construct an enthalpy-composition diagram for particular binary system over a temperature range covering the two-phase vapor-liquid region at the pressure of the distillation. What is the enthalpy of a (two phase) feed stream at 1 kg/cm2 pressure, 82C, 0.6 wt% ethanol?Įnthalpy vs. Generate analytical expressions (curve fit) We will use enthalpies in energy balances later.įor example, if one were given a feed mixture of 35% ethanol (weight %) at T = 92oC and P = 1 kg/cm2 and the mixture was allowed to separate into vapor and liquid, what would be the enthalpies of the feed, vapor, and liquid? The major purpose of an enthalpy diagram is to determine enthalpies. There are several disadvantages to using graphical techniques: One cannot readily plot multi-component systems graphically DEPRIESTER CHART FOR ETHANOL FREEĬomposition (P constant, T) Ponchon-Savarit PlotĪnalytical expressions Thermodynamics: Equations of state/Gibbs free energy models x,y (P constant) Saturated Liquid, Vapor Plot Enthalpy vs.
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