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Ponchon Savarit Graphical Equilibrium Stage Method

Housam Binous
Organization: KFUPM
Department: Chemical Engineering
URL: http://sites.google.com/site/homepageofdrhousambinous/
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The notebook shows how one can compute the number of equilibrium stages of a distillation column for the separation of a binary mixture using the Ponchon Savarit Graphical Equilibrium Stage Method. The mixture is composed of hexane and octane at a total pressure of 14.696 psia. Feed, distillate and Bottom compositions are 0.5, 0.95 and 0.05, respectively. Feed quality is q = 0.41. We start by computing the enthalpy versus composition diagram. We show how one can plot tie lines and the conjugate line. Then, we compute the number of equilibrium stages at total reflux. The condenser is a partial condenser. 4 stages are required including the partial condenser and reboiler. In addition, we obtain the difference points and L/D minimum. We find L/D minimum = 1.03244. Difference points when L/D is 1.5 times greater than L/D minimum are obtained. We step off stages in the stripping and rectifying sections to get the following results: the optimum feed stage is stage 3 and the total number of stages required including the partial condenser and reboiler is 7 We conclude by calculating the operating lines if we assume Equimolar Overflow and non Equimolar Overflow.

*Engineering > Chemical Engineering
*Science > Chemistry

Ponchon Savarit, Graphical Equilibrium Stage Method, Non Equimolar Overflow, Equimolar Overflow, Total Reflux, Enthalpy versus Composition Diagram, Tie lines and Conjugate line
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Ponchon-SavaritHexaneOctane.nb (378.3 KB) - Mathematica Notebook [for Mathematica 5.0]