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Excess volumes,isentropic compressions,and isobaric heat capacities for methanol mixed with other alkanols at 25°C
Authors:Hideo Ogawa  Sachio Murakami
Institution:(1) Department of Chemistry, Faculty of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, 558 Osaka, Japan
Abstract:Excess volumes, excess isentropic compressions and excess isobaric heat capacities for binary liquid mixtures of methanol with ethanol, 1-propanol and 1-butanol have been determined at 25° C. These thermodynamic functions are smaller than those for alkanol + water mixtures and are correlated with the difference in the alkyl chain length in two of the alkanol molecules. The behavior of the component molecules in solution is found to be similar to that in the pure liquid. The excess isentropic compressions of methanol + 1-butanol show an S-shaped concentration dependence with a positive lobe in the methanol rich range and a negative lobe in the methanol poor range, which resembles that of the excess Gibbs energy reported by Polak et al.
Keywords:Methanol  ethanol  1-propanol  1-butanol  methanol + alkanol mixtures  excess volume  excess heat capacity  speed of sound  excess compressibility  excess compression
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