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| Titel: |
THERMODYNAMIC EXCESS PROPERTIES IN BINARY MIXTURES OF MOLECULES OF DIFFERENT SIZES AND SHAPES |
| Auteur: |
Dana Dragoescu A. Barhala Rodica Vîlcu |
| Verschenen in: |
Analele Universitatii Bucuresti. Chimie |
| Paginering: | Jaargang XI (2002) nr. I pagina's 37-44 |
| Jaar: |
2002 |
| Inhoud: |
Isothermal vapour-liquid equilibrium (VLE) data for binary mixtures of 2-propanone with1-chloropentane (I), 1,3-dichloropropane (II), 1,4-dichlorobutane (III), 1,1,1-trichloroethane (IV)and 1,1,2,2-tetrachloroethane (V), within the 298.15-313.15 K temperature range are evaluated.Total vapour pressures were measured by a static method, the mixtures being prepared by weightand degassed directly into the working cell. The experimental data were correlated by Barker’smethod and different expressions for excess Gibbs energy were tested. The results indicatedpositive (for (I), III), (IV) mixtures) and negative (for (II), (V) mixtures) deviations fromideality.Our GE and HE values obtained from VLE data and those available in the literature are compared.These evidenced the existence of the specific interactions (H bonding) between the componentsof the mixtures and the proximity effects of the Cl atoms.For 2-propanone + ,!-dichloroalkanes, GE and HE (algebraic) values increase in the order:dichloromethane>1,2-dichloroethane>1,3-dichloropropane>1,4-dichlorobutane. For 2-propanone+ polychloroalkanes, GE and HE decrease in the sequence: tetrachloromethane>1,1,1-trichloroethane>dichloroethane>trichloromethane>1,1,2,2-tetrachloroethane. The H bondstrength increases from dichloromethane to 1,1,2,2-tetrachloroethane. |
| Uitgever: |
Ars Docendi Publishing House (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 77 van 83 gevonden artikelen
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