Comment on “Crossover description of transport properties for some hydrocarbons in the supercritical region”

Abstract

In this comment, we discuss Kaghazchi et al.’s recent paper “Crossover description of transport properties for some hydrocarbons in the supercritical region”. Their method employs the PC-SAFT equation of state’s (EoS) heat capacity predictions to estimate crossover thermal conductivity. However, we mention that this approach is inadequate due to the PC-SAFT EoS’s limitations near critical points. The PC-SAFT EoS assumes fluid homogeneity, which breaks down near the critical point, leading to significant density fluctuations and heterogeneity. The PC-SAFT EoS also fails to accurately predict the singularity behavior of heat capacities (Cp) and (Cv). Therefore, while the PC-SAFT EoS is generally reliable for predicting fluid properties, its limitations near the critical point should be considered.