Thermodynamic properties of (LiCl + N, N-dimethylacetamide) and (LiBr + N, N-dimethylacetamide) at temperatures from (323.15 to 423.15) K

• Published in: The Journal of chemical thermodynamics Vol. 37; no. 4; pp. 331 - 341
• Main Authors: Nasirzadeh, Karamat, Neueder, Roland, Kunz, Werner
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-04-2005; Elsevier
• Subjects: Chemical model; Chemical thermodynamics; Chemistry; Exact sciences and technology; General and physical chemistry; Lithium bromide; Lithium chloride; Mixtures; MSA-NRTL model; N, N-Dimethylacetamide; Osmotic coefficient; Pitzer’s model; Thermodynamic properties; Vapor pressure; MSA-NRTL model; Vapor pressure; Lithium chloride; Lithium bromide; Osmotic coefficient; N, N-Dimethylacetamide; Chemical model; Pitzer’s model; N,N-Dimethylacetamide; Electrolyte solution; Pitzer's model; Ionic interaction; Thermodynamic model; Carboxamide; Non random two liquid model; Thermodynamic properties
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2004.09.015

Precise vapor pressure data for LiCl and LiBr solutions in
N,
N-dimethylacetamide are given for
T
=
(323.15 to 423.15) K. The molality ranges covered in this study are about
m
=
(0.073 to 1.89) mol
·
kg
−1 for lithium chloride and
m
=
(0.06 to 1.75) mol
·
kg
−1 for lithium bromide. Osmotic coefficients are calculated by taking into account the second virial coefficient of
N,
N-dimethylacetamide. The parameters of the extended Pitzer-ion interaction model of Archer, of the MSA-NRTL model and of the chemical model of Barthel are evaluated. These models accurately reproduce the experimental osmotic coefficients within different concentration ranges. The parameters of the Pitzer-ion interaction model of Archer are used to calculate the mean molal activity coefficients and excess Gibbs free energies. The non-ideal behaviors of these systems are discussed in terms of the model parameters.