Excess molar volumes and ultrasonic studies of N-methyl-2-pyrrolidone with ketones at T = 303.15 K

• Published in: The Journal of chemical thermodynamics Vol. 41; no. 5; pp. 586 - 590
• Main Authors: Gnana Kumari, P., Venkatesu, P., Prabhakara Rao, M.V., Lee, Ming-Jer, Lin, Ho-mu
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.05.2009; Elsevier
• Subjects: Chemical thermodynamics; Chemistry; Deviation in isentropic compressibility; Exact sciences and technology; Excess molar volumes; General and physical chemistry; Ketones; Mixtures; Molecular interactions; NMP; Thermodynamic properties; Ultrasonic sound velocity; NMP; Ultrasonic sound velocity; Ketones; Excess molar volumes; Molecular interactions; Deviation in isentropic compressibility; Isentropic compression; Polar solvent; Molar volume; Lactam; Excess parameter; Molecular interaction; Ketone; Protic solvent; Operating conditions; Sound velocity; Binary mixture; Organic solvent; Acoustic properties; Dipolar solvent; Thermodynamic properties; Ultrasound
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2009.01.006

Excess molar volumes ( V E ) and ultrasonic studies at T = 303.15 K and atmospheric pressure have been measured over the whole composition range for the binary mixtures of N-methyl-2-pyrrolidone (NMP) with ketones. The ketones studied in the present investigation include methyl ethyl ketone (MEK), diethylketone (DEK), methyl propyl ketone (MPK), methyl isobutyl ketone (MIBK), and cyclohexanone (CH). The V E values were measured using a dilatometer and were negative over the entire mole fraction range for NMP with MEK, DEK, MPK, and MIBK and were positive for NMP with CH. The ultrasonic sound velocities for the above systems were measured with a single crystal interferometer at a frequency of 3 MHz. The sound velocity ( u) results have been used to calculate isentropic compressibility ( K s ) and deviation in isentropic compressibility (Δ K s ) over the entire range of volume fraction. The sound velocity results have been predicted in terms of free length theory (FLT), collision factor theory (CFT), and Nomoto relation. The results reveal that all the theories gave a satisfactory estimate of the sound velocity. The deviation values of the isentropic compressibilities (Δ K s ) were negative over the entire range of volume fraction in all the binary liquid mixtures except in the binary system NMP with CH, where we observed positive Δ K s values. The results are interpreted on possible molecular interactions between components.