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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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Appendix B. Instructions for Fitting VLE and LLE Data with Aspen Plus

The vapor-liquid equilibrium (VLE) and liquid-liquid extraction (LLE) correlations in Aspen Plus are not always as accurate as possible. This can cause significant errors, particularly near pinch points in distillation columns. If data is available, Aspen Plus will find values of the parameters for any of the VLE or LLE correlations by doing a regression against the data you input. This is illustrated to obtain an improved fit for the non-random two-liquid (NRTL) VLE correlation for the binary system water and isopropanol (IPA). VLE data for water and isopropanol is listed in Table B-1. This system has a minimum boiling azeotrope at ~80.46°C. The Aspen Plus fit to the data ...

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