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Thermodynamics of hydrogen-bonding mixtures. 5. GE, HE, and TSE and zeotropy of water + acrylic acid / James D. Olson in Industrial & engineering chemistry research, Vol. 47 n°15 (Août 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5127–5131 Titre : Thermodynamics of hydrogen-bonding mixtures. 5. GE, HE, and TSE and zeotropy of water + acrylic acid Type de document : texte imprimé Auteurs : James D. Olson, Auteur ; Richard E. Morrison, Auteur ; Loren C. Wilson, Auteur Année de publication : 2008 Article en page(s) : p. 5127–5131 Note générale : Bibliogr. p. 5131 Langues : Anglais (eng) Mots-clés : Stirred-flask  ebulliometer  --  vapor-pressure;  Zeotrope;  Vapor—liquid  equilibrium Résumé : A stirred-flask ebulliometer was used to measure total vapor-pressure (PTx) data on nine mixtures of water + acrylic acid (and the pure components) between 45 and 112 °C and pressures from 10.00 to 101.325 kPa. These PTx data and the derived vapor—liquid equilibrium data show no azeotropic behavior. To verify that water + acrylic acid is a zeotrope at 101.325 kPa, dilute-solution ΔT data at 101.325 kPa were measured in a twin-arm Cottrell-lift-pump ebulliometer. Data on water + propanoic acid, with a known azeotrope at 101.325 kPa, were measured to test the experimental method. These dilute-solution measurements confirmed the known azeotrope for water + propanoic acid and conclusively demonstrated zeotropy for water + acrylic acid at 101.325 kPa. The system exhibits large positive deviations from ideality (derived γ∞ = 2.5−5.7) that decrease with increasing temperature. Equimolar GE/T derived from fitted isothermal activity coefficient parameters decreases with increasing temperature, which predicts a positive HE. The excess function data show that the system water + acrylic acid belongs to the class of mixtures where GE > 0 and HE > 0 (this includes other water + organic acid mixtures); TSE shows a crossover from TSE > 0 to TSE < 0. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0712277 [article] Thermodynamics of hydrogen-bonding mixtures. 5. GE, HE, and TSE and zeotropy of water + acrylic acid [texte imprimé] / James D. Olson, Auteur ; Richard E. Morrison, Auteur ; Loren C. Wilson, Auteur . - 2008 . - p. 5127–5131. Bibliogr. p. 5131 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5127–5131 Mots-clés : Stirred-flask  ebulliometer  --  vapor-pressure;  Zeotrope;  Vapor—liquid  equilibrium Résumé : A stirred-flask ebulliometer was used to measure total vapor-pressure (PTx) data on nine mixtures of water + acrylic acid (and the pure components) between 45 and 112 °C and pressures from 10.00 to 101.325 kPa. These PTx data and the derived vapor—liquid equilibrium data show no azeotropic behavior. To verify that water + acrylic acid is a zeotrope at 101.325 kPa, dilute-solution ΔT data at 101.325 kPa were measured in a twin-arm Cottrell-lift-pump ebulliometer. Data on water + propanoic acid, with a known azeotrope at 101.325 kPa, were measured to test the experimental method. These dilute-solution measurements confirmed the known azeotrope for water + propanoic acid and conclusively demonstrated zeotropy for water + acrylic acid at 101.325 kPa. The system exhibits large positive deviations from ideality (derived γ∞ = 2.5−5.7) that decrease with increasing temperature. Equimolar GE/T derived from fitted isothermal activity coefficient parameters decreases with increasing temperature, which predicts a positive HE. The excess function data show that the system water + acrylic acid belongs to the class of mixtures where GE > 0 and HE > 0 (this includes other water + organic acid mixtures); TSE shows a crossover from TSE > 0 to TSE < 0. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0712277