Enhancement of the extended corresponding states techniques for thermodynamic modeling. I. Pure fluids

This work, limited to pure fluids' modeling, has two main goals. The first one is to discuss in a rigorous way the modeling background of the conventional extended corresponding states (ECS) methods proposed in the literature. A critical review is in the meantime developed allowing to point out the limits of the methods. The second goal is to propose a practicable and plain solution for the use of ECS as the basic framework to develop a fundamental equation of state (EoS) for a target fluid in a totally correlative mode. For this purpose the conventional analytical procedure was left out and an optimization procedure, based on a general function approximator, was applied. The model capability to accurately represent several thermodynamic surfaces of a number of haloalkanes is verified assuming data generated from the corresponding EoSs. The achieved results show that the method is robust and straightforward, while the obtained prediction accuracies for the thermodynamic functions are competitive with those of the available conventional EoSs. (c) 2006 Elsevier Ltd and IIR. All rights reserved.