Abstract
In this study, we develop an improved volume-translation model for perturbed-chain statistical associating fluid theory (PC-SAFT) equation of state (EOS). The new volume translation model is based on a distance function that measures the distance between the current condition and a critical point. This volume translation model is integrated into a particular version of PC-SAFT, which can exactly reproduce the critical points of pure compounds. The proposed volume-translated PC-SAFT EOS is found to exactly reproduce the critical properties of pure compounds (including critical pressure, critical temperature, and critical molar volume) and yield accurate reproductions of the saturated liquid density, liquid density, and vapor pressure of the selected 39 pure fluids over a wide range of temperatures and pressures, covering the critical and non-critical regions. Overall, the newly developed volume-translated SAFT EOS model yields average absolute percentage deviations (%AADs) of only 0.505, 0.470, and 0.676, in reproducing the saturated liquid density, liquid density, and vapor pressure, respectively.
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