Simple Distillation Residue Curves for a Mixture of Chloroform and Acetone at 760 mmHg
Simple Distillation Residue Curves for a Mixture of Chloroform and Acetone at 760 mmHg
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:
dx
dξ
x(ξ=0)=
x
0
x=Ky
where is the warped time, is the chloroform mole fraction in the still at , is the equilibrium constant, and is the initial ethanol composition in the still.
ξ
x(ξ)
ξ
K
x
0
Since a negative azeotrope exists for this mixture, the still has the azeotropic composition for large (i.e., ), independent of the initial composition in the still.
ξ
x(ξ→∞)=0.6613