Vapor-liquid equilibria using the Gibbs energy and the common tangent plane criterion

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Title: Vapor-liquid equilibria using the Gibbs energy and the common tangent plane criterion
Authors: Olaya, Maria del Mar | Reyes-Labarta, Juan A. | Serrano Cayuelas, María Dolores | Marcilla, Antonio
Research Group/s: Procesado y Pirólisis de Polímeros | Red Social de Innovación Educativa de la Facultad de Ciencias | Cálculo del Equilibrio entre Fases | Docencia en Ingeniería Química
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química
Keywords: VLE | Vapor-liquid | Phase | Equilibria | Gibbs | Energy | Stability | Criteria
Knowledge Area: Ingeniería Química
Date Created: 22-Jan-2010
Issue Date: 1-Jun-2010
Publisher: American Society for Engineering Education. Chemical Engineering Division
Citation: OLAYA, María del Mar, et al. “Vapor-liquid equilibria using the Gibbs energy and the common tangent plane criterion”. Chemical Engineering Education. Vol. 44, No. 3 (Summer 2010). ISSN 0009-2479, pp. 236-244
Abstract: Phase thermodynamics is often perceived as a difficult subject that many students never become fully comfortable with. The Gibbsian geometrical framework can help students to gain a better understanding of phase equilibria. An exercise to interpret the vapor-liquid equilibrium of a binary azeotropic mixture, using the equilibrium condition based on the common tangent plane criterion (the Gibbs stability test), is presented in this paper. From a T-composition phase diagram for the mixture, the temperature is set at different values: above, intermediate to, and below the boiling temperatures of the pure components, to intersect different regions of the system. Students prepare an Excel spreadsheet where the Gibbs energy of mixing of the vapor and liquid mixtures are calculated and represented over the whole range of compositions and then, apply the Gibbs stability test to ascertain the aggregation state of the system and to calculate the VL phase equilibrium compositions. Finally, Matlab is used to generate the 3D Gibbs energy of mixing surfaces for both phases over the whole range of temperatures which facilitates the geometrical interpretation of the vapor-liquid equilibrium.
Sponsor: The Vicepresidency of Research (University of Alicante) and Generalitat Valenciana (GV/2007/125).
URI: http://hdl.handle.net/10045/24677
ISSN: 0009-2479
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Copyright ChE Division of ASEE 2010
Peer Review: si
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