Les systèmes eau/ester. I. Etude calorimétrique des systèmes eau/acétate d'alcoyle

1976 ◽  
Vol 54 (16) ◽  
pp. 2584-2593 ◽  
Author(s):  
Dominique Richon ◽  
André Viallard
Keyword(s):  
Homologous Series ◽  
Water Systems ◽  
Calorimetric Study ◽  
Thermodynamic Quantities ◽  
Excess Enthalpies ◽  
Molar Excess ◽  
Alkyl Acetate ◽  
Mutual Solubilities ◽  
Enthalpies Of Solvation

A calorimetric study of alkyl acetate/water systems has been carried out in the complete homogeneous and heterogeneous domain of mole fractions. The sign, intensity, and trends of excess enthalpies and mutual solubilities are discussed.Values of the excess enthalpies for ester/water homogeneous mixtures are used for the determination of partial molar excess enthalpies and enthalpies of "solvation" at infinite dilution.The trends of the thermodynamic quantities in this homologous series are discussed in terms of ester/water interactions.

Calorimetric study of deuterium isotope effects in water-acetone systems

1981 ◽  
Vol 34 (3) ◽  
pp. 635 ◽  
Author(s):  
JR Khurma ◽  
DV Fenby
Keyword(s):  
Isotope Effects ◽  
Exothermic Reaction ◽  
Deuterium Exchange ◽  
Calorimetric Study ◽  
Excess Enthalpies ◽  
Exchange Reactions ◽  
Molar Excess ◽  
Deuterium Isotope Effects

Molar excess enthalpies of H20 + (CH3),CO, H20 + (CD3),C0, D20 + (CH3)2C0 and D20+ (CD3)2CO at 298.15 K are reported and, in the case of the first system, compared with earlier studies. The results are comparable to those reported for deuterium isotope effects in the molar excess enthalpies of other systems containing (CH3)2CO and (CD3)2CO; they do not suggest the occurrence of any deuterium exchange reactions. A calorimetric study of the mixing of (CD3)2CO with H2O containing a small quantity of NaOH indicates the occurrence of slow, exothermic reaction(s).

Calorimetric study of deuterium isotope effects in water-acetic acid systems

1980 ◽  
Vol 33 (11) ◽  
pp. 2349 ◽  
Author(s):  
JR Khurma ◽  
DV Fenby
Keyword(s):  
Acetic Acid ◽  
Isotope Effects ◽  
Calorimetric Study ◽  
Excess Enthalpies ◽  
Molar Excess ◽  
Deuterium Isotope Effects

The molar excess enthalpies of water+acetic acid systems are analysed to give the enthalpy of the reaction ������������� 2HA(1)+D2O(1) → 2DA(1)+H2O(1) (A=CH3COO or CD3COO) the value obtained at 298 K is -0.15�0.04 kJ mol-1. Molar excess enthalpies at 298.15 K are reported for the systems H2O+CH3COOH, H2O+CD3COOD, D2O+CH3COOH and D2O+CD3COOD.

Mutual solubilities of hydrocarbon–water systems with F-SAC

2014 ◽  
Vol 384 ◽  
pp. 122-133 ◽  
Author(s):  
L.F.K. Possani ◽  
R.L. Simões ◽  
P.B. Staudt ◽  
R. de P. Soares
Keyword(s):  
Water Systems ◽  
Mutual Solubilities

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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