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

Authors: 
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.