| 초록 |
An equation of state for pure fluids developed by combining a reference equation for hard-sphere-chain fluids established by Hu et al. and perturbation term proposed by Sadowski. Three characteristic parameters are required to describe the thermodynamic properties of pure fluids, which are obtained from experimental data of the corresponding pure saturated liquids. This perturbation equation, however, is obtained by a rough approximation and therefore, only can be granted by introducing another model parameter that scales the non-ideal behavior of several types of fluids. In this study, the structure parameter, ζKB, is introduced and determined according to the type of molecular structure and intermolecular forces. We examine the proposed model to various chemical structures of fluids such as normal alkanes, cycloalkanes, aromatic rings, ketones, and alcohols. Theoretical calculations for the vapor-liquid equilibria (VLE) of pure fluids show good agreement with the experimental data. Each chemical structure has its own values of ζKB. Further, the proposed model also describes the thermodynamic properties of the polymers systems fairly well. |
