Excess volume and excess enthalpy of binary mixtures composed of 1,2-dichloropropane and 1-alkanol (C5-C8)
| Autor: | Moon Gab Kim, Hyo-Won Sim |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
UNIQUAC
Chemistry General Chemical Engineering Enthalpy Thermodynamics 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Endothermic process Isothermal process Calorimeter Enthalpy change of solution 020401 chemical engineering Volume (thermodynamics) Non-random two-liquid model 0204 chemical engineering 0210 nano-technology |
| Zdroj: | Korean Journal of Chemical Engineering. 33:271-276 |
| ISSN: | 1975-7220 0256-1115 |
| DOI: | 10.1007/s11814-015-0155-2 |
| Popis: | 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 H and V are fitted to a modified version of Redlich-Kister equation using the Pade approximant to correlate the composition dependence. The experimental H 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. |
| Databáze: | OpenAIRE |
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