Abstract
Vacuum distillation of a zinc-silver (Zn–Ag) alloy under a system pressure of 5–10 Pa was conducted in the temperature range of 1173–1373 K. The Zn content in the Zn–Ag alloy was reduced from 70.80 wt% to 0.0026 wt% via a single-stage distillation process at a temperature >1373 K. The molecular interaction volume model (MIVM) was reasonably simplified. The activities of the Zn–Ag alloy components were calculated using the simplified molecular interaction volume model (SMIVM). The calculated average standard deviation for Zn and Ag were ±0.0078 and ±0.0082, and the average relative deviations were ±4.6758% and ±4.7564%, respectively. Simplicity and reliability are significant advantages of the SMIVM. The vapor-liquid equilibrium (VLE) phase diagram (T-x diagram) of the Zn–Ag alloy during vacuum distillation was calculated using the SMIVM and VLE theory. The results agree with the VLE data determined from experiments, which indicate that the resulting VLE phase diagram is reliable. The VLE phase diagram of alloys provides an intuitive and effective method for process optimization, development, and prediction of the dependence of product composition on system pressure and temperature during vacuum distillation.
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