Documents disponibles écrits par cet auteur

Thermodynamics of mixtures containing oxaalkanes. 7. / Juan Antonio Gonzalez in Industrial & engineering chemistry research, Vol. 51 N° 13 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 5108-5116 Titre : Thermodynamics of mixtures containing oxaalkanes. 7. : Random mixing in ether + CCl4 systems Type de document : texte imprimé Auteurs : Juan Antonio Gonzalez, Auteur ; Isaias García de la Fuente, Auteur ; José Carlos Cobos, Auteur Année de publication : 2012 Article en page(s) : pp. 5108-5116 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Thermodynamics  Mixing Résumé : Mixtures of a linear or cyclic ether + CCl4 have been studied using the Flory model and the Kirkwood-Buff integrals formalism. The relative variation of the molar excess enthalpy, HEm, along the homologous series of the investigated systems was investigated in terms of the contributions to HEm from the breaking of the ether-ether and CCl4-CCl4 interactions upon mixing and the formation of ether-CCl4 interactions. For CH3(CH2)u-l(CH2CH2O)v(CH2)u-lCH3 + CCl4 mixtures, an increase in u (v = 0) leads to a weakening of interactions between unlike molecules. In contrast, an increase in v (u fixed) or cyclization leads to stronger interactions between unlike molecules. For acetal mixtures, proximity effects weaken this type of interaction. From the application of the two models, it is shown that the structure of the mixtures is close to that of random mixing. Erroneously, strong orientational effects are predicted by the Flory model for 1,3-dioxolane or 1,3-dioxane + CCl4 systems, but this is because the theory cannot describe asymmetric HEm curves when the mixture compounds have similar values for Vi (molar volume) and for V*i (reduction parameter for volume). The Flory results on the excess molar volumes are discussed in terms of the interactional, curvature, and P* contributions to this excess function. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300094e [article] Thermodynamics of mixtures containing oxaalkanes. 7. : Random mixing in ether + CCl4 systems [texte imprimé] / Juan Antonio Gonzalez, Auteur ; Isaias García de la Fuente, Auteur ; José Carlos Cobos, Auteur . - 2012 . - pp. 5108-5116. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 5108-5116 Mots-clés : Thermodynamics  Mixing Résumé : Mixtures of a linear or cyclic ether + CCl4 have been studied using the Flory model and the Kirkwood-Buff integrals formalism. The relative variation of the molar excess enthalpy, HEm, along the homologous series of the investigated systems was investigated in terms of the contributions to HEm from the breaking of the ether-ether and CCl4-CCl4 interactions upon mixing and the formation of ether-CCl4 interactions. For CH3(CH2)u-l(CH2CH2O)v(CH2)u-lCH3 + CCl4 mixtures, an increase in u (v = 0) leads to a weakening of interactions between unlike molecules. In contrast, an increase in v (u fixed) or cyclization leads to stronger interactions between unlike molecules. For acetal mixtures, proximity effects weaken this type of interaction. From the application of the two models, it is shown that the structure of the mixtures is close to that of random mixing. Erroneously, strong orientational effects are predicted by the Flory model for 1,3-dioxolane or 1,3-dioxane + CCl4 systems, but this is because the theory cannot describe asymmetric HEm curves when the mixture compounds have similar values for Vi (molar volume) and for V*i (reduction parameter for volume). The Flory results on the excess molar volumes are discussed in terms of the interactional, curvature, and P* contributions to this excess function. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300094e