| Titre : | Renormalization - group corrections to the perturbed - chain statistical associating fluid theory for binary mixtures (2010) |
| Auteurs : | Xiaohua Tang, Auteur ; Joachim Gross, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 49 N° 19, Octobre 2010) |
| Article en page(s) : | pp. 9436–9444 |
| Note générale : | Chimie industrielle |
| Langues : | Anglais |
| Tags : | Statistical associating fluid theory |
| Résumé : | Classical fluid theories do not describe the long-range fluctuations that occur in the vicinity of a pure component or mixture’s critical point. The perturbed-chain statistical associating fluid theory (PC-SAFT) equation of state is extended with a renormalization group theory for mixtures. The theory accounts for the long-range density fluctuations and the results reduce to the results of the classical PC-SAFT equation of state away from the critical point. Two approximation methods, the isomorphic approximation and phase-space cell approximation, are used for the renormalization group corrections of mixtures. The two variants are evaluated by comparison to experimental vapor−liquid data for systems of alkanes, carbon dioxide and hydrogen sulfide. Overall, the considered implementation of the phase-space cell approximation is slightly superior to the isomorphic approximation for the mixtures investigated here. The phase-space cell approximation tends to overestimate the renormalization corrections for some cases but generally leads to good agreement with experimental data for binary mixtures. |
| ISSN : | 0888-5885 |
| En ligne : | http://pubs.acs.org/doi/abs/10.1021/ie100890d |
