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  • Submitted: Jan 28 2013 01:25 PM
  • Last Updated: Jan 28 2013 01:25 PM
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Download Vapor Liquid Equilibrium Data - Wilson Coefficients

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vapor liquid equilibrium data wilson coefficients


Collection of binary vapor-liquid equilibrium data from Wilson Coefficients.  Many different systems presented in MS Excel workbook.

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Apr 25 2015 08:55 AM

The Wilson Equation is incapable of predicting liquid phase splitting.  Therefore, it cannot predict VLE for heteroazeotropic systems, such as water-toluene.  Therefore, I would suggest deleting that binary from the "Wilson Coefficient" page of the spreadsheet.  Also, on the main page, users should be cautioned about this important limitation of the Wilson equation.  I would also suggest to Mr. Kumar that he consider replacing the Wilson equation with the UNIQUAC equation, which overcomes this deficiency.  However, the UNIQUAC equation requires two pure component parameetrs (r and q).  These are available from the literature or can readily be calculated from the relevant UNIFAC groups.


Another option is to use the NRTL model, which requires three binary interaction parameters; however, the third parameter ("alpha") is symmetrical.  The problem one faces with this model is that, for binary LLE data, it is theoretically feasible to estimate only two interaction parameters, so the alpha must be set arbitrarily.  For VLE data, however, three parameters can readily be obtained by regression.


Mr. Kumar has done well to provide this spreadsheet, and I encourage him to continue his effforts with these other models also.

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