Feasible Regions for Product Compositions in Ternary Mixtures

The Demonstration plots the feasible regions for product compositions in an ideal ternary mixture of , , and , where the lightest component is and the heaviest compound is ; here the relative volatilities are 12.67, 5.35, and 1.0. You can set the feed location by dragging the locator. The yellow regions correspond to product compositions for direct split ( split; i.e., is obtained as a distillate while and are bottom products). On the other hand, the magenta regions correspond to product compositions for indirect split ( split; i.e., and are obtained as distillates and is found in the bottom).

The blue and red curves are such that product purities below them cannot be accomplished by a single distillation column. These two curves meet at the feed location. They are obtained by solving the following equations:

The summation rules: and ,

The ideal vapor-liquid relations: and ,

and .

For more information, see:

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