Residue Curve in a Ternary Equilateral Diagram

Consider a ternary mixture of chloroform, acetone, and methanol at

101.325kPa

. The vapor-liquid equilibrium (VLE) behavior is described by the modified Raoult's law with activity coefficients predicted by the Wilson model [1]. This mixture presents four azeotropes, whose locations and boiling points are:

		mole%		BP°C
	chloroform	methanol	acetone
A 1	65.52	34.48	-	53.82
A 2	-	20.93	79.07	55.35
A 3	66.13	-	33.21	64.45
A 4	22.90	43.89	33.21	57.32

This Demonstration plots the residue curve for user-selected positions of the locator (shown by a blue circle), which has to be inside the ternary equilateral diagram.