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Simple Distillation Residue Curves for a Mixture of Chloroform and Acetone at 760 mmHg

initial chloroform mole fraction in the still

0.5

The vapor-liquid equilibrium behavior of a binary mixture of chloroform and acetone at 760 mmHg can be obtained using the Wilson model and a modification of Raoult's law.

This mixture exhibits a maximum boiling azeotrope, whose composition is 66.13% chloroform mole fraction.

The simple distillation residue curve is the solution of the following differential-algebraic equation:

dξ

=x-y

x(ξ=0)=

, and

x=Ky

where

is the warped time,

x(ξ)

is the chloroform mole fraction in the still at

is the equilibrium constant, and

is the initial ethanol composition in the still.

Since a negative azeotrope exists for this mixture, the still has the azeotropic composition for large

(i.e.,

x(ξ→∞)=0.6613

), independent of the initial composition in the still.

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