Find a graphical solution to Example 8.19 by determining where the Gibbs energy of the system is at a minimum.

Example 8.19

Calculate the equilibrium composition of the two liquid phases in a binary mixture of methyl diethylamine (a) and water (b) at 1 bar and 20°C. Solve this problem in two ways; by graphical methods and by using a computer program to solve it numerically. The following three-suffi x Margules parameters have been obtained for this binary system:

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and B = -384 [J/mol] A = 6349 [J/mol] and