Excess volumes and excess enthalpies of N-methyl-2-pyrrolidone with branched alcohols

• Published in: Fluid phase equilibria Vol. 252; no. 1; pp. 137 - 142
• Main Authors: Gnanakumari, P., Venkatesu, P., Mohan, K. Rama, Rao, M.V. Prabhakara, Prasad, D.H.L.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.2007; Elsevier Science
• Subjects: Binary mixture; Branched alkanols; Chemical thermodynamics; Chemistry; Exact sciences and technology; Excess enthalpies; Excess molar volumes; General and physical chemistry; Hydrogen bonding; Mixtures; Molecular interactions; N-Methyl-2-pyrrolidone; Thermodynamic properties; Binary mixture; N-Methyl-2-pyrrolidone; Excess molar volumes; Molecular interactions; Branched alkanols; Excess enthalpies; Hydrogen bonding; Molar volume; Enthalpy; Alcohol; Excess parameter; Molecular interaction; Branched compound; Organic solvent; Alkanol; Thermodynamic properties; Hydrogen bond
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/j.fluid.2006.12.012

Excess molar volumes ( V E) at 303.15 K and excess enthalpies ( H E) at 298.15 K and ambient pressure have been measured as a function of composition for the binary liquid mixtures of N-methyl-2-pyrrolidone (NMP) with branched alcohols. The branched alcohols include 2-propanol, 2-butanol, 2-methyl-1-propanol, 2-methyl-2-propanol and 3-methyl-1-butanol. The V E values were measured using a dilatometer and are negative over the entire mole fraction range for all the systems. The H E values for the above mixtures have been measured by a Paar 1451 solution calorimeter and are positive over the whole range of compassion. The experimental results have been correlated using Redilich–Kister polynomials and the results are interpreted on the basis of possible hydrogen bonding between unlike molecules and changes in molecular association equilibria as well as structural effects for these systems.