An excess Gibbs free energy based model to calculate viscosity of multicomponent liquid mixtures

2015 ◽  
Vol 42 ◽  
pp. 494-501 ◽  
Author(s):  
Diego D.D. Pinto ◽  
Hallvard F. Svendsen
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Liquid Mixtures ◽  
Excess Gibbs Free Energy ◽  
Multicomponent Liquid Mixtures

Thermodynamic Excess Functions of Binary Liquid Mixtures with Chain Association of One Component*. Part I: The Excess Gibbs Free Energy GE/RT

1976 ◽  
Vol 31 (12) ◽  
pp. 1651-1660 ◽  
Author(s):  
F. Becker ◽  
M. Kiefer ◽  
P. Rhensius ◽  
H. D. Schäfer
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Chain Length ◽  
Liquid Mixtures ◽  
Binary Liquid Mixtures ◽  
Excess Gibbs Free Energy ◽  
Component Part ◽  
Excess Functions ◽  
Binary Liquid ◽  
Self Association

Abstract In this paper equilibrium models for the calculation of the excess Gibbs free energy of binary liquid mixtures are developed, the component A of which undergoes chain-forming self-association whilst the component B acts as an 'inert' solvent. It is shown that the extension of the well-known chain-association model of Mecke and Kempter, in which the probability of chain prolongation is assumed to be independent of chain length, is unable to establish satisfactory results because it does not exhibit sufficient unsymmetry. Reduction of the probability of chain growth with in-creasing chain length leads to an improved model with the geometric series replaced by the exponential series. This model, in which only two parameters are used, i. e. the equilibrium constants K for mutual solvation of A and B, and ρ for self-association of A, allows fitting of isothermal experimental GE /R T literature data on cycloalkanol-cycloalkane, alkanol-alkane, and NMF -CCl4 systems within the limits of experimental error. Compared with the two-parameter Wilson equation which gives equally small standard deviations, our equilibrium model has the advantage of allowing passage from GE to HE data and of being applicable to liquid-liquid equilibria.

Isobaric vapour–liquid equilibria of 1-bromobutane + chloroethane systems

1991 ◽  
Vol 69 (2) ◽  
pp. 311-314 ◽  
Author(s):  
K. Rambabu ◽  
P. Venkateswarlu ◽  
G. K. Raman ◽  
Y. V. L. Ravi Kumar
Keyword(s):  
Free Energy ◽  
Key Words ◽  
Gibbs Free Energy ◽  
Activity Coefficients ◽  
Boiling Point ◽  
Composition Range ◽  
Liquid Mixtures ◽  
Excess Gibbs Free Energy ◽  
Binary Liquid ◽  
Point Data

The boiling point data for the binary liquid mixtures of 1-bromobutane with 1,2-dichloroethane, 1,1,1-trichloroethane, and 1,1,2,2-tetrachloroethane were obtained over the entire composition range by using a standard Swietoslawski type ebulliometer at 715 Torr. The experimental t–x data were used to estimate Wilson parameters and also to calculate the equilibrium vapor compositions for these systems. These Wilson parameters were used to calculate activity coefficients and these in turn were used to compute excess Gibbs free energy. Key words: Wilson parameters, 1-bromobutane + chloroethane systems.

Activity coefficients and excess Gibbs’ free energy of some binary mixtures formed by p-cresol at 95.23kPa

2007 ◽  
Vol 39 (7) ◽  
pp. 1022-1026 ◽  
Author(s):  
T.E. Vittal Prasad ◽  
N. Venkanna ◽  
Y. Naveen Kumar ◽  
K. Ashok ◽  
N.M. Sirisha ◽  
...  
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Binary Mixtures ◽  
Activity Coefficients ◽  
Excess Gibbs Free Energy
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