Appendix B. Instructions for Fitting VLE and LLE Data with Aspen Plus
The vapor-liquid equilibrium (VLE) and liquid-liquid equilibrium (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 are 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.
The regression method is illustrated to obtain an improved fit for the nonrandom two-liquid (NRTL) VLE correlation for the binary system water and isopropanol (IPA) (listed in Aspen Plus as isopropyl-alcohol). VLE data for water and isopropanol are listed in Table B-1. This system has a minimum-boiling ...
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