Vapor−Liquid Equilibria and Excess Enthalpies for Binary Mixtures ofN-Methylacetamide with 1-Octene, Dipropylamine, Triethylamine, Pyridine, and Methanol at 125 °C

1997 ◽  
Vol 42 (3) ◽  
pp. 597-602 ◽  
Author(s):  
André B. de Haan ◽  
Kai Fischer ◽  
Michael Haacke ◽  
Jürgen Gmehling
Keyword(s):  
Binary Mixtures ◽  
Excess Enthalpies ◽  
Vapor Liquid Equilibria ◽  
Vapor Liquid

Thermodynamics of binary mixtures containing a very strongly polar compound — Part 3: DISQUAC characterization of NMP + organic solvent mixtures

2003 ◽  
Vol 81 (12) ◽  
pp. 1451-1461 ◽  
Author(s):  
J A González ◽  
U Domanska ◽  
J Lachwa
Keyword(s):  
Molecular Structure ◽  
Organic Solvent ◽  
Binary Mixtures ◽  
Mean Field Theory ◽  
Interaction Parameters ◽  
Solvent Mixtures ◽  
Excess Enthalpies ◽  
Dipole Interactions ◽  
Vapor Liquid Equilibria ◽  
Vapor Liquid

Binary mixtures of 1-methyl pyrrolidin-2-one (NMP) with alkanes, benzene, toluene, 1-alkanol, or 1-alkyne have been investigated in the framework of the DISQUAC model. The reported interaction parameters change regularly with the molecular structure of the mixture components. The model consistently describes a set of thermodynamic properties, including liquid–liquid equilibria, vapor–liquid equilibria, solid–liquid equilibria, and molar excess enthalpies. A brief comparison of the DISQUAC results and those obtained from the UNIFAC and ERAS models is presented. The experimental excess enthalpies are better represented by DISQUAC than by UNIFAC because this quantity strongly depends on molecular structure. For NMP + alkane mixtures, the liquid–liquid equilibria data are also better represented by DISQUAC, while UNIFAC more accurately describes the vapor–liquid equilibria measurements at temperatures close to the critical point. This result suggests that a mean field theory is not able to represent simultaneously, with the same set of interaction parameters, liquid–liquid and vapor–liquid equilibria at the mentioned temperatures. ERAS fails when treating mixtures with 1-alkanols. This has been attributed to the strong dipole–dipole interactions between NMP molecules, characteristic of the investigated systems. Mixture structure is briefly studied in terms of the concentration–concentration structure factor.Key words: thermodynamics, NMP, organic solvent, self-association, dipole–dipole interactions.

Isobaric vapor-liquid equilibria for binary mixtures of ethylbenzene and p-xylene with dimethylformamide

1987 ◽  
Vol 32 (2) ◽  
pp. 198-201 ◽  
Author(s):  
O. P. Bagga ◽  
Virender K. Rattan ◽  
Sukhmehar Singh ◽  
Bhupinder P. S. Sethi ◽  
K. S. N. Raju
Keyword(s):  
Binary Mixtures ◽  
Vapor Liquid Equilibria ◽  
Vapor Liquid
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