In this study, experimental vapor-liquid equilibria data of the ternary
Pb-Sn-Sb alloy system are determined using a new experimental method. The
experimental VLE data passed the thermodynamic consistency test(Van Ness test),
suggesting that the experimental results are reliable. The activities of
the components of Pb-Sn-Sb ternary alloy and those of the corresponding three
constituent binaries were calculated using the Wilson equation. The predicted
values are in good agreement with the data determined from experiments, and
the average relative deviation and average standard deviation were smaller
than ? 4.00%and ? 0.03for all constituent binaries, respectively, which
indicates that the Wilson equation is reliable for calculating the activity of
the components of the Pb-Sn-Sb ternary alloy. The VLE data of the Pb-Sn and
Sb-Sn binary alloys and Pb-Sn-Sb ternary alloy were calculated based on the VLE
theory and Wilson equation. The calculated VLE data were in good agreement with
the data determined from experiments, indicating that this method is reliable for
calculating the VLE of alloy systems. The proposed study offers a valid method for
analyzing the composition of products that are dependent on
the distillation temperature and system pressure during vacuum distillation,
which is of great significance to the experimental design of this process.
Isobaric vapor-liquid equilibria of ternary lead-tin-antimony alloy system at 2 Pa