Observations regarding the first and second order thermodynamic derivative properties of non-polar and light polar fluids by perturbed chain-SAFT equations of state

This paper focuses on the second order derivative properties of some pure components, as the most significant challenges to develop the equations of states. For this reason, PC-SAFT equation of state has been used to predict derivative properties of n-alkanes, such as heat capacities, the speed of sound and Joule-Thomson coefficient in the wide temperature and pressure ranges up to 20 MPa. The performance of this model is evaluated against experimental data so that a good agreement with predicted properties can be observed except near the critical point and in some cases, near the coexistence phases. Furthermore, this study has tried to demonstrate the capability of polar sPC-SAFT equation of state to estimate the saturated pressure, liquid density and the speed of sound for light alcohols. Therefore, the system-dependent parameters of this model have been reassigned. The results have been compared with the available literature data and have shown a very good agreement.