Residue Curves at High Total Pressures

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram CDF Player or other Wolfram Language products.

Requires a Wolfram Notebook System

Edit on desktop, mobile and cloud with any Wolfram Language product.

This Demonstration shows the residue curve of a non-ideal ternary mixture composed of chloroform, acetone, and methanol at a total pressure of 10 atm. Deviation from ideal gas phase behavior must be considered. Indeed, the vapor-phase fugacity coefficient is computed using the Soave–Redlich–Kwong equation of state. This mixture presents three binary azeotropes and a ternary azeotrope, marked in the ternary diagram by for . Azeotropes appear as extrema of the residue curves. You can drag the locator and the program will plot the residue curve passing through the locator position. The location of the ternary azeotrope has been determined separately since it is neither a stable nor an unstable node. Compositions of all binary azeotropes are obtained from the residue curve calculations, as follows:


Binary azeotropes:

Methanol-Chloroform: 45.54% Chloroform

Methanol-Acetone: 42.75% Acetone

Chloroform-Acetone: 70.90% Chloroform