(414a) Optimization of the Peng-Robinson Equation of State In the Application for Supercritical Carbon Dioxide

Angulo, F., Tenneessee Tech University
Oyanader, M., Tenneessee Tech University
Stretz, H. A., Tennessee Technological University
Thompson, J. W., Tennessee Technological University

Supercritical carbon dioxide is a powerful solvent in many applications which only requires mild conditions for use, and is therefore a material of interest in industry. Consequently, the role of supercritical carbon dioxide as a solvent is of great importance and gives rise to the necessity of accurate models. Furthermore, effective modeling of production and unit operation processes is a goal all engineers strive for in order to accurately predict and optimize said processes. One such case is the use of the Peng-Robinson Equation of State for predicting conditions at critical levels. However, the current form of the Peng-Robinson EoS is not adequate for producing accurate values at conditions beyond the critical point and is therefore a candidate for optimization. By use of numerical approximation methods and generalized form fittings, new parameters are produced which allow for corrections to the non ideality of the Peng-Robinson EoS above the critical point. Ultimately, predicting pressure, molar volume, and enthalpy data as a function of temperature by use of the Peng-Robinson EoS will be possible. This is to provide potential practitioner with ready to use tool for the prediction of thermodynamic properties.