| Journal: | Brazilian journal of chemical engineering |
| Database: | PERIÓDICA |
| System number: | 000308961 |
| ISSN: | 0104-6632 |
| Authors: | Pessoa-Filho, P.A1 Mohamed, R.S |
| Institutions: | 1Universidade Estadual de Campinas, Faculdade de Engenharia Quimica, Campinas, Sao Paulo. Brasil |
| Year: | 2004 |
| Season: | Sep |
| Volumen: | 21 |
| Number: | 3 |
| Pages: | 471-478 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, analítico |
| English abstract | Mixtures containing compounds that undergo hydrogen bonding show large deviations from ideal behavior. These deviations can be accounted for through chemical theory, according to which the formation of a hydrogen bond can be treated as a chemical reaction. This chemical equilibrium needs to be taken into account when applying stability criteria and carrying out phase equilibrium calculations. In this work, we illustrate the application of the stability criteria to establish the conditions under which a liquid-phase split may occur and the subsequent calculation of liquid-liquid equilibrium using a chemical-theory-modified Flory-Huggins equation to describe the non ideality of aqueous two-phase systems composed of poly(ethylene glycol) and dextran. The model was found to be able to correlate ternary liquid-liquid diagrams reasonably well by simple adjustment of the polymer-polymer binary interaction parameter |
| Disciplines: | Química |
| Keyword: | Ingeniería química, Sistema acuoso bifásico, Modelado termodinámico, Energía libre de Gibbs, Equilibrio líquido-líquido |
| Keyword: | Chemistry, Chemical engineering, Aqueous two-phase system, Thermodynamic modeling, Gibbs energy, Liquid-liquid equilibrium |
| Full text: | Texto completo (Ver HTML) |
