Thermodynamics of Viscous Flow in Ethane-1,2-diol+Water Binary Mixtures

1995 ◽  
Vol 48 (1) ◽  
pp. 103 ◽  
Author(s):  
F Corradini ◽  
A Marchetti ◽  
M Tagliazucchi ◽  
L Tassi ◽  
G Tosi
Keyword(s):  
Molecular Dynamics ◽  
Gibbs Energy ◽  
Viscous Flow ◽  
Molecular Interactions ◽  
Excess Gibbs Energy ◽  
Thermodynamic Temperature ◽  
Empirical Equations ◽  
Excess Function ◽  
Pure Species ◽  
Gibbs Energy Of Activation

Kinematic viscosities (v) of pure ethane-1,2-diol (component 1) and of nine mixtures with water (component 2) were measured at 19 temperatures ranging from -10 to +80°C, and for binary compositions covering the whole miscibility field expressed by the relation 0 ≤ X1 ≤ 1. The property fitted some empirical equations in terms of the dependences v = v(T) and v(X1), where T is the thermodynamic temperature and X1 is the mole fraction of ethane-1,2-diol. Furthermore, the excess function (vE) and the excess Gibbs energy of activation of viscous flow (∆G*E) have been investigated. The trend of vE against binary composition of the mixtures shows negative deviations from ideal behaviour, while the contrary is true for ∆G*E The results indicate specific molecular interactions between the components, and an overview is given on the basis of the molecular dynamics of the pure species.

Thermodynamic Analysis of Viscosity Data of Ethane-1,2-diol+1,4-Dioxan Binary Mixtures

1994 ◽  
Vol 47 (6) ◽  
pp. 1117 ◽  
Author(s):  
F Corradini ◽  
A Marchetti ◽  
M Tagliazucchi ◽  
L Tassi ◽  
G Tosi
Keyword(s):  
Binary System ◽  
Viscous Flow ◽  
Composition Range ◽  
Viscosity Data ◽  
Empirical Equations ◽  
Specific Interactions ◽  
Excess Function ◽  
Binary Composition ◽  
Gibbs Energy Of Activation ◽  
Experimental Values

Kinematic viscosities (v) have been measured for pure ethane-1,2-diol, 1,4-dioxan and for nine of their mixtures covering the entire composition range and, where possible, at 19 temperatures from -10 to +80°C. The experimental values were converted into dynamic viscosities (η) and were correlated with temperature and binary composition by some empirical equations. Furthermore, the excess function ηE and the excess Gibbs energy of activation of viscous flow ΔG*E have been evaluated. Negative deviations from ideality are always observed for this binary system, this fact indicating strong specific interactions between unlike entities in solution to form stable solvent- cosolvent adducts. Activation enthalpies and entropies for viscous flow have been derived, and their dependence on binary composition is also discussed.

Thermodynamic Interactions in Binary Mixtures of 2-Methoxyethanol with Alkyl and Aryl Esters at 298.15, 303.15 and 308.15 K

1993 ◽  
Vol 58 (8) ◽  
pp. 1761-1776 ◽  
Author(s):  
Tejraj M. Aminabhavi ◽  
Shrinivas K. Raikar
Keyword(s):  
Gibbs Energy ◽  
Excess Gibbs Energy ◽  
Excess Volume ◽  
Isentropic Compressibility ◽  
Standard Errors ◽  
Refractive Indices ◽  
Excess Viscosity ◽  
Quadratic Equations ◽  
Gibbs Energy Of Activation ◽  
Excess Isentropic Compressibility

Densities, viscosities, refractive indices, and sound velocities of 2-methoxyethanol + ester mixtures have been measured at 298.15, 303.15 and 308.15 K. These data have been used to calculate excess volume, excess isentropic compressibility, excess refraction, excess viscosity and excess Gibbs energy of activation of flow. These quantities have been fitted to quadratic equations to estimate the parameters and standard errors. The results have been interpreted in term of the intermolecular interactions between the mixing components.

On Temperature Dependence of Excess Gibbs Energy

1999 ◽  
Vol 64 (7) ◽  
pp. 1093-1099 ◽  
Author(s):  
Ivona Malijevská ◽  
Anatol Malijevský
Keyword(s):  
Heat Capacity ◽  
Gibbs Energy ◽  
Temperature Dependence ◽  
Excess Gibbs Energy ◽  
Excess Enthalpy ◽  
Excess Heat Capacity ◽  
Wilson Equation ◽  
Excess Heat ◽  
Energy Excess ◽  
Wilson And Nrtl Equations

Temperature dependence of GE is discussed for three widely used equations linear and nonlinear in parameters. It is shown that the Wilson equation predicts always positive excess heat capacity regardless of values of its parameters. Several temperature modifications of the Redlich-Kister, Wilson and NRTL equations are discussed with respect to the sign of the excess Gibbs energy, excess enthalpy and excess heat capacity.

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