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Received May 28, 2015
Accepted July 10, 2015
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Excess volume and excess enthalpy of binary mixtures composed of 1,2-dichloropropane and 1-alkanol (C5-C8)
School of Nano & Materials Science and Engineering, Kyungpook National University, 386 Gajang-dong, Sangju 742-711, Korea
mg_kim@knu.ac.kr
Korean Journal of Chemical Engineering, January 2016, 33(1), 271-276(6), 10.1007/s11814-015-0155-2
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Abstract
The excess molar volumes and excess molar enthalpies at T=298.15 K and atmospheric pressure for the binary systems {CH3CHClCH2Cl (1)+CH3(CH2)n.1OH (2)} (n=5 to 8) have been determined over the whole range of composition from the density and heat flux measurements using a digital vibrating-tube densimeter and an isothermal calorimeter, respectively. The measured excess molar volumes of all binary mixtures showed positive symmetrical trend with values increasing with chain length of 1-alkanol. Similarly, excess enthalpy values of all binary mixtures showed skewed endothermic behavior with values increasing with chain length of 1-alkanol. The maxima of excess molar enthalpy values were observed around x1=0.65 with excess enthalpy value ranging from 1,356.8 J/mol (1-pentanol) to 1,543.4 J/mol (1-octanol). The experimental results of both Hm E and Vm E are fitted to a modified version of Redlich-Kister equation using the Pade approximant to correlate the composition dependence. The experimental Hm E data were also fitted to three local-composition models (Wilson, NRTL, and UNIQUAC). The correlation of excess enthalpy data in these binary systems using UNIQUAC model provides the most appropriate results.
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References
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