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

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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.

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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:

, , and ,

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.

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.

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Contributed by: Housam Binous (March 2011)
Open content licensed under CC BY-NC-SA


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For more information, see

M. F. Doherty and M. F. Malone, Conceptual Design of Distillation Systems, New York: McGraw-Hill, 2001.



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