Abstract
Excess molar volumes VE and excess molar heat capacities C E P at constant pressure have been measured, at 25°C, as a function of composition for the four binary liquid mixtures propylene carbonate (4-methyl-1,3-dioxolan-2-one, C4H6O3; PC) + benzene (C6H6;B), + toluene (C6H5CH3;T), + ethylbenzene (C6H5C2H5;EB), and + p-xylene (p-C6H4(CH3)2;p-X) using a vibrating-tube densimeter and a Picker flow microcalorimeter, respectively. All the excess volumes are negative and noticeably skewed towards the hydrocarbon side: VE (cm3-mol−1) at the minimum ranges from about −0.31 at x1=0.43 for {x1C4H6O3+x2p-C6H4(CH3)2}, to −0.45 at x1=0.40 for {x1C4H6O3+x2C6H5CH3}. For the systems (PC+T), (PC+EB) and (PC+p-X) the C E P s are all positive and even more skewed. For instance, for (PC+T) the maximum is at x 1,max =0.31 with C E P,max =1.91 J-K−1-mol−1. Most interestingly, C E P of {x1C4H6O3+x2C6H6} exhibits two maxima near the ends of the composition range and a minimum at x 1,min =0.71 with C E P,min =−0.23 J-K−1-mol−1. For this type of mixture, it is the first reported case of an M-shaped composition dependence of the excess molar heat capacity at constant pressure.
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Communicated at the Festsymposium celebrating Dr. Henry V. Kehiaian's 60th birthday, Clermont-Ferrand, France, 17–18 May 1990.
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Wilhelm, E., Jimenez, E., Roux-Desgranges, G. et al. Excess molar heat capacities and excess molar volumes of some mixtures of propylene carbonate with aromatic hydrocarbons. J Solution Chem 20, 17–28 (1991). https://doi.org/10.1007/BF00651637
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DOI: https://doi.org/10.1007/BF00651637