Activity coefficients and excess Gibbs energy of binary mixtures of N,N-dimethyl formamide with selected compounds at 95.5kPa

2008 ◽  
Vol 273 (1-2) ◽  
pp. 52-58 ◽  
Author(s):  
T.E. Vittal Prasad ◽  
A. Adi Sankara Reddy ◽  
S. Kailash ◽  
D.H.L. Prasad
Keyword(s):  
Gibbs Energy ◽  
Binary Mixtures ◽  
Activity Coefficients ◽  
Excess Gibbs Energy ◽  
Dimethyl Formamide

Excess Gibbs energy for binary mixtures of acetonitrile with acetic acid, propionic acid, isobutyric acid, and trimethylacetic acid

1991 ◽  
Vol 69 (12) ◽  
pp. 2117-2121 ◽  
Author(s):  
T. S. Banipal ◽  
B. S. Lark ◽  
S. Singh
Keyword(s):  
Acetic Acid ◽  
Gibbs Energy ◽  
Carboxylic Acids ◽  
Propionic Acid ◽  
Binary Mixtures ◽  
Activity Coefficients ◽  
Excess Gibbs Energy ◽  
Composition Range ◽  
Isobutyric Acid ◽  
Dimerization Constant

Total vapour pressures for binary mixtures containing acetic acid, propionic acid, isobutyric acid, and trimethylacetic acid with acetonitrile have been measured for the entire composition range at 298.15 and 318.15 K using a static manometric method. All systems show positive deviations from Raoult's law, enhanced by both an increase in temperature and an increase in the methylation of acetic acid. Activity coefficients have been calculated by taking into consideration the dimerization of these carboxylic acids in the vapour phase. TSE values obtained from GE and earlier reported HE values are found to be negative for acetic acid, about zero for propionic and isobutyric acids, and positive for trimethylacetic acid for the whole composition range. The results have been interpreted in terms of various contributions such as depolymerization, heteromolecular dipole–dipole interactions, and the increasing dimerization constant and steric hindrance with increase of complexity of the acid. Key words: excess Gibbs energy, carboxylic acids, acetonitrile, activity coefficients

Vapour pressures and excess Gibbs energy of ethylbenzene-cyclooctane binary mixtures

1996 ◽  
Vol 126 (1) ◽  
pp. 127-134 ◽  
Author(s):  
Mariana Teodorescu ◽  
Alexandru Barhala ◽  
Dumitru I. Marchidan ◽  
Ortansa Landauer
Keyword(s):  
Gibbs Energy ◽  
Binary Mixtures ◽  
Excess Gibbs Energy
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