Abstract
A study was undertaken to determine the potential for using infinite-dilution excess enthalpy data with activity coefficient models to predict vapor-liquid equilibria for binary systems. Expressions for the infinite-dilution reduced excess enthalpies in a binary liquid mixture derived from the Wilson or NRTL equation with temperature-independent parameters are solved for two unknown model parameters given limiting values of reduced excess enthalpy (partial molar excess enthalpy) H E /x 1 x 2 . The Wilson equation is modified using the van der Waals covolume b in place of the pure-liquid molar volume, and an average value of the nonrandomness factor is chosen to obtain a two-parameter NRTL equation. Vapor-liquid equilibria were predicted for 19 isothermal and 8 isobaric binary systems. Good results are generally obtained for nearly ideal systems using either model; however, the Wilson equation is superior for moderately nonideal systems. The temperature-independent Wilson model fails to accurately describe vapor-liquid equilibria for strongly nonideal mixtures with highly unsymmetric excess enthalpy profiles. The proposed method appears to be particularly well suited for estimating phase behavior of environmentally safe refrigerant mixtures
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
