Cálculo de propriedades termodinâmicas através da equação de estado cúbica de Patel - Teja e suas modificações

Abstract

The description of the precise behavior of thermodynamic properties of pure substances is of great relevance for the evaluation of an Equation of State (EOS) in order to classify to rank with regard to accuracy, predictive power and computational cost. Mota (2019) proposed modifications to the existing parameters in the Patel-Teja equation of state to increase the predictive power of thermodynamic properties of this equation, thus increasing the confidence of this EOS along the saturation region. For this purpose, the accuracy of the modifications of the thermodynamic parameters of the Patel-Teja equation of state proposed by Mota with respect to the modifications made by Forero-Vel ́asquez, the original proposed by Patel-Teja and some results available in the literature are evaluated. The thermodynamic properties investigated are: saturated liquid and vapor volumes, enthalpy, entropy and internal vaporization energy, heat capacity at constant pressure and vapor, velocity of sound and Joule-Thomson coefficient of liquid and vapor of 22 pure polar substances and nonpolar. Based on the results, we can confirm the validity of the new parameters proposed by Mota (2019) for the prediction of thermodynamic properties along the studied region.