Lecture 9 Binary Flash Distillation-updated 2012

Lecture 9 Binary Flash Distillation-updated 2012 - Lecture...

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3/20/2012 1 • Equilibrium data: enthalpy plots • Distillation + flash distillation • Binary flash distillation - Degrees of freedom - Sequential solution (algebraic and graphical) - Ex #1 - Determining x min and y max - Determining Q H - Simultaneous solution Lecture 9: Binary Flash Distillation 1 x y y x y L y x x V + = + =
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3/20/2012 2 Distillation Feed Stream F, z T drum P drum T 1 P 1 Liquid Vapor V, y L, x If you are trying to “remove” component, then you want: a) x A < z A b) x A > z A c) y A < z A d) y A < x A Binary mixture of A and B Flash (equilibrium) distillation Fractional (column) distillation Differential (batch) distillation Binary Distillation: 3 Basic Types
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3/20/2012 3 Binary Flash Distillation Pump Heat Q H Valve Feed F, z, T 1 , P 1 h 1 T F , P F h F T Drum V, y, H v L, x, h L P Drum Adiabatic so Q flash =0 What happens to the mole fraction of methanol in the liquid when the feed is pumped into a drum where P DRUM < P FEED ? 0 2 4 6 8 10 0 0.2 0.4 0.6 0.8 1 Mole Fraction of MeOH in liquid (x) or vapor (y) System Pressure, psia T = 50 o C P Feed P Drum a. x
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