Calorimetric measurement of partial molar excess enthalpies at infinite dilution

1991 ◽  
Vol 36 (1) ◽  
pp. 112-118 ◽  
Author(s):  
D. Mark Trampe ◽  
Charles A. Eckert
Keyword(s):  
Infinite Dilution ◽  
Calorimetric Measurement ◽  
Excess Enthalpies ◽  
Molar Excess

Activity coefficients and partial molar excess enthalpies at infinite dilution for four esters in water

2010 ◽  
Vol 295 (2) ◽  
pp. 194-200 ◽  
Author(s):  
Vladimír Dohnal ◽  
Pavel Vrbka ◽  
Karel Řehák ◽  
Alexander Böhme ◽  
Albrecht Paschke
Keyword(s):  
Activity Coefficients ◽  
Infinite Dilution ◽  
Excess Enthalpies ◽  
Molar Excess

Calorimetric measurement of molar excess enthalpies of dilute solutions of ethylbenzene + higher n-alkanes

1997 ◽  
Vol 302 (1-2) ◽  
pp. 159-164 ◽  
Author(s):  
P.M. Ghogomu ◽  
M. Bouroukba ◽  
J. Dellacherie ◽  
D. Balesdent ◽  
M. Dirand
Keyword(s):  
Calorimetric Measurement ◽  
Excess Enthalpies ◽  
Dilute Solutions ◽  
Molar Excess

Thermodynamics of mixtures containing the CO and OH groups. I. Estimation of the DISQUAC interchange coefficients for 1-alkanol + n-alkanone systems

1997 ◽  
Vol 75 (10) ◽  
pp. 1412-1423 ◽  
Author(s):  
Juan Antonio González
Keyword(s):  
Infinite Dilution ◽  
Detailed Comparison ◽  
Excess Enthalpies ◽  
Oh Groups ◽  
Molar Excess ◽  
Relative Standard ◽  
Wide Range ◽  
Different Temperatures ◽  
Group Contribution Model ◽  
Solid Liquid

1-Alkanol + n-alkanone mixtures are treated in terms of the DISQUAC group contribution model, reporting the interaction parameters for hydroxyl–carbonyl contacts. The quasichemical interchange coefficients are independent of the compounds in the mixture; the dispersive interchange coefficients depend on the intramolecular environment of the hydroxyl and (or) carbonyl groups. Mixtures of a given 1-alkanol with isomeric ketones are characterized by the same first dispersive interaction parameter, which is constant from 2-pentanone. This type of system, when including an alcohol up to 1-pentanol, needs different dispersive enthalpic parameters depending on the symmetry of the ketone. In this case, such parameters are constant from 2-pentanone or 3-pentanone. A detailed comparison is presented between DISQUAC results and data available in the literature on vapour–liquid equilibria, VLE (including azeotropic data), molar Gibbs energies, GE, molar excess enthalpies, HE, solid–liquid equilibria, SLE, natural logarithms of activity coefficients, In [Formula: see text] and partial molar excess enthalpies at infinite dilution,[Formula: see text]. For 54 systems, the mean relative standard deviation in pressure is 0.018; for 61 systems, this magnitude in the case of the HE is 0.059. It is noteworthy that the model yields good predictions over a very wide range of temperature for VLE and SLE. HE is also reasonably well represented at different temperatures. Larger discrepancies are encountered, as usual, for partial molar quantities at infinite dilution. Keywords: liquids, mixtures, thermodynamic properties, group contributions.

Aromatic fluorocarbon mixtures. VI. Vapour pressures of carbon tetrachloride + hexafluorobenzene

1974 ◽  
Vol 27 (10) ◽  
pp. 2159 ◽  
Author(s):  
NF Pasco ◽  
DV Fenby
Keyword(s):  
Carbon Tetrachloride ◽  
Thermodynamic Properties ◽  
Equations Of State ◽  
Liquid Mixture ◽  
Excess Enthalpies ◽  
Molar Excess ◽  
Mixture Theories

Measurements are reported of the vapour pressures of the system carbon tetrachloride + hexafluorobenzene at 278.68 K. The molar excess Gibbs functions GE/M, obtained from these measurements have been combined with previously reported molar excess enthalpies to give GE/M at 298 K. Thermodynamic properties of CCl4+C6F6 at 298 K are compared with the predictions of liquid mixture theories based on analytic equations of state.

Molar excess enthalpies for some systems containing the OH and (or) O groups in the same or in different molecules

2002 ◽  
Vol 80 (3) ◽  
pp. 292-301 ◽  
Author(s):  
Jose Carlos Cobos ◽  
Isaias Garcia de la Fuente ◽  
Juan Antonio Gonzalez
Keyword(s):  
The Self ◽  
Excess Functions ◽  
Excess Enthalpies ◽  
Effective Dipole Moment ◽  
Group Interactions ◽  
Molar Excess ◽  
Dipole Interactions ◽  
Eras Model ◽  
Self Association ◽  
Molar Excess Volumes

In this work, HmE data at 298.15 K for the systems 1-nonanol + n-C12; 1-nonanol + n-C14; 1-hexanol + 3,6,9-trioxaundecane; and 2-(2-butoxyethoxyethanol) + n-C7 are reported. Measurements were carried out with a standard Calvet-type microcalorimeter. Molar excess functions, including enthalpies and entropies, are carefully examined to report on the main features of the studied solutions. Dipole–dipole interactions between ether molecules are, therefore, of great importance in both 1-alkanols + polyoxaalkanes mixtures and between hydroxyether molecules in alkoxy ethanols + n-alkanes systems. In the second case, it has been attributed to the existence of intramolecular H-bonds in alkoxy ethanols as well as to their higher effective-dipole moment in comparison to that of homologous 1-alkanols. DISQUAC is the only model that can be used to accurately represent thermodynamic functions (except molar excess volumes, VmE) of all of the solutions under study. UNIFAC underestimates dipole–dipole interactions in 1-alkanols + polyoxaalkanes and alkoxyethanols + n-alkanes systems. In exchange, the self-association of the alcohol is overestimated in mixtures of 1-nonanol with n-alkanes. Currently, the ERAS model can only be used to examine these solutions. The variation of the VmE with the size of the n-alkanes is well described. Key words: excess functions, OH group, O group, interactions, models.

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