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VTPR
VTPR (short for Volume-Translated Peng–Robinson)〔Ahlers J., "Entwicklung einer universellen Gruppenbeitragszustandsgleichung", Thesis, Carl-von-Ossietzky-Universität Oldenburg, 1-144, 2003〕〔Schmid B., "Einsatz einer modernen Gruppenbeitragszustandsgleichung für die Synthese thermischer Trennprozesse", Thesis, C.v.O. Universität Oldenburg, 2011〕
is an estimation method for the calculation of phase equilibria of mixtures of chemical components. The original goal for the development of this method was to enable the estimation of properties of mixtures which contain supercritical components. These class of substances couldn't be predicted with established models like UNIFAC.
== Principle ==
VTPR is a group contribution equation of state. This is class of prediction methods combine equations of state (mostly cubic) with activity coefficient models based on group contributions like UNIFAC. The activity coefficient model is used to adapt the equation of state parameters for mixtures by a so-called mixing rule.
The usage of an equation of state introduces all thermodynamic relations defined for equations of state into the VTPR model. This allows the calculation of densities, enthalpies, heat capacities, and more.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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