Density and Viscosity of 2-Butanol + (1-Propanol, 2-Propanol, or 3-Amino-1-propanol) Mixtures at Temperatures of (293.15 to 323.15) K: Application of the ERAS Model

2019 ◽  
Vol 64 (6) ◽  
pp. 2292-2302 ◽  
Author(s):  
Sanaz Gharehzadeh Shirazi ◽  
Fakhri Kermanpour
Keyword(s):  
Eras Model

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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