# Binary Distillation of Non-Ideal Mixtures Using Driving-Force Diagrams

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The driving-force diagram for a binary mixture is obtained by plotting versus , where and are the liquid and vapor mole fractions of the light component. Indeed, the driving force is , where and are the vapor-liquid equilibrium (VLE) constants. For example, VLE behavior of a binary mixture composed of pentane and dichloromethane is predicted by setting and .

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Contributed by: Housam Binous (March 2011)

(Kind Fahd University Petroleum & Minerals)

Open content licensed under CC BY-NC-SA

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References

[1] R. Gani and E. Bek–Pedersen, "Simple New Algorithm for Distillation Column Design," *AIChE Journal*, 46(6), 2000 pp. 1271–1274.

[2] E. Bek–Pedersen, R. Gani, and O. Levaux, "Determination of Optimal Energy Efficient Separation Schemes Based on Driving Forces,"* Computers and Chemical Engineering,* 24(2-7), 2000 pp. 253–259.

[3] E. Bek–Pedersen and R. Gani, "Design and Synthesis of Distillation Systems Using a Driving-Force-Based Approach," *Chemical Engineering and Processing*, 43(3), 2004 pp. 251–262.

[4] W. L. McCabe and E. W. Thiele, "Graphical Design of Fractionating Columns," *Industrial and Engineering Chemistry*, 17(6), 1925 pp. 605–611.