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Chemical Engineering Hand Written_Notes_Part_2

# Chemical Engineering Hand Written_Notes_Part_2 - 6 1...

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6 1. MATHEMATICAL MODELING AND SIMULATION Figure 4 vaporize and two phases at the equilibrium with each other will be present in the fl ash drum. The equilibrium relationships are Temperature of the liquid phase = temperature of the vapor phase. Pressure of the liquid phase = pressure of the vapor phase. Chemical potential of the i 0 th component in the liquid phase = Chem- ical potential of the i 0 th component in the vapor phase Example 2 . Consider fl ash vaporization unit shown in Figure 4. A hydro- carbon mixture containing 25 mole % of n butane, 45 mole %of n -hexane is to be separated in a simple fl ash vaporization process operated at 10 atm. and 270 0 F. The equilibrium k- values at this composition are Component z i k i n-butane 0.25 2.13 n-pentane 0.45 1.10 n-hexane 0.30 0.59 Let x i represent mole fraction of the component i in liquid phase and y i represent mole fraction of the component i in vapor phase. Model equations for the fl ash vaporizer are Equilibrium relationships (2.10) k i = y i /x i ( i = 1 , 2 , 3) Overall mass balance (2.11) F = L + V

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2. MECHANISTIC MODELS AND ABSTRACT EQUATION FORMS
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