Determination of Interfacial Tension of Binary Mixtures of n-alkanes + CH\(_4\) and n-alkanes + CO\(_2\) Using Density Gradient Theory and Peng-Robinson Equation of State at Elevated Temperatures and Pressures

The interfacial tensions of alkanes in the presence of CH4 and CO2 were predicted using the model taken as a combination of Density Gradient theory and Peng-Robinson equation of state and compared with existing simulation data. The main aim of this work was to make a progress in modeling the IFTs between diverse n-alkanes and CH4 and CO2 natural gases. Several statistical measures and graphical descriptions were employed to aid the accuracy analysis of the proposed model. The statistical measures indicate a complex relationship among thermal conditions, model selection, and performance metrics, which can be observed by examining the tables presented in this work. Overall, the results indicate that the Peng-Robinson equation effectively predicted the interfacial tensions.