1. Comparison of 12 Equations of State with Respect to Gas-Extraction Processes: Reproduction of Pure-Component Properties When Enforcing the Correct Critical Temperature and Pressure
| Autor: | Oliver Pfohl, Gerd Brunner, Tim Giese, Ralf Dohrn |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Chemistry
Component (thermodynamics) General Chemical Engineering Extraction (chemistry) Supercritical fluid extraction Thermodynamics General Chemistry Statistical mechanics Industrial and Manufacturing Engineering Supercritical fluid Thermodynamic model symbols.namesake symbols Determination methods van der Waals force |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie970524g |
| Popis: | Modeling gas-extraction processes carried out at temperatures and pressures slightly above the critical temperature and pressure of the supercritical solvent requires equations of state (EOS) that correctly reproduce the critical temperature and pressure of the solvent. EOS that are based on statistical mechanics instead of on simple van der Waals theory are known to be superior at high densities, as encountered in gas-extraction processes. But most of these EOS overpredict the critical temperature and pressure of pure compounds significantly, if conventional pure-component parameter determination methods are applied. Here, a universal pure-component parameter determination method is proposed that enforces the correct reproduction of a pure compound's critical temperature and pressure. This guarantees qualitatively correct calculation results for mixtures in the region important for gas-extraction processes. This method reduces the number of adjustable pure-component parameters by two, compared to convent... |
| Databáze: | OpenAIRE |
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