Thermodynamic Properties of Decane

Temperature Pressure Density Volume Int. energy Enthalpy Entropy C, CT Sound speed Joule-Thomson Therm, cond. Viscosity 

The values in these tables were generated from the NIST REFPROP software (Lemmon, E. W., McLinden, M. O., and Huber, M. L., NIST Standard Reference Database 23 Reference Fluid Thermodynamic and Transport Properties—REFPROP, National Institute of Standards and Technology, Standard Reference Data Program, Gaithersburg, Md., 2002, Version 7.1). The primary source for the thermodynamic properties is Lemmon, E. W,. and Span, R., Short Fundamental Equations of State for 20 Industrial Fluids, /. Chem. Eng. Data, 51(3) 785-850, 2006. The source for viscosity is Huber, M. L., Laesecke, A., and Xiang, H. W, Viscosity Correlations for Minor Constituent Fluids in Natural Gas n-Octane, n-Nonane and n-decane, Fluid Phase Equilibria 224 263-270, 2004. The source for thermal conductivity is Huber, M. L., and Perkins, R. A., Thermal Conductivity Correlations for Minor Constituent Fluids in Natural Gas n-Octane, n-Nonane and n-Decane, Fluid Phase Equilibria 227 47-55, 2004. 

The uncertainties in density are 0.05% in the saturated liquid density between 290 and 320 K, 0.2% in the liquid phase at temperatures to 400 K (with somewhat higher uncertainties above 100 MPa, up to 0.5%), 1% in the liquid phase up to 500 MPa, and 2% at higher temperatures as well as in the vapor phase. Vapor pressures have an uncertainty of 0.2%, and the uncertainties in liquid heat capacities and liquid sound speeds are 1%. The uncertainty in heat capacities may be higher at pressures above 10 MPa. The estimated uncertainty in viscosity is 1% along the saturated liquid line, 2% in compressed liquid to 200 MPa, 5% in vapor and supercritical regions. Uncertainty in thermal conductivity is 3%, except in the supercritical region and dilute gas which have an uncertainty of 5%. 

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Wieczorek, S. A. Vapour pressures and thermodynamic properties of decan-l-ol + n-hexane between 283.160 and 333.151 K J. 

R.K. Mitra, B.K. Pal, and S.P. Moulik 2006 Phase behavior, interfacial composition and thermodynamic properties of mixed surfactant (CTAB and Brij-58) derived w/o microemulsions with 1-butanol and 1-pentanol as cosurfactants and n-heptane and -decane as oils, J. Colloid Interf. Sci. 300, 755-764. 

This work results in correlations which can be used to predict parameters for the RK equation of state for hydrocarbon and other nonpolar components for which the critical pressure, critical temperature, and acentric factor are known or can be estimated. However, the applicability of the correlations to large molecules is unproven because the generalized correlations of physical and thermodynamic properties used to develop Oa and Ob are based on components no heavier than n-decane (acentric factor = 0.4885). Although the predicted parameters are based on properties for the saturated liquid phase, the parameters are applied to both vapor and liquid phases. For components above their critical temperature (a reduced temperature greater than 1.00), the values of fia and Ob determined at a reduced temperature of unity are used. 

This definition gives values for a> of essentially zero for spherically symmetric molecules (e.g., the noble gases). Values of o) for 176 compounds are tabulated in Appendix I. For the species in Fig. 4.3, values of to are 0.00, 0.2415, 0,4869, and 0.6341, respectively, for methane, toluene, n-decane, and ethyl alcohol. Modification of the R-K equation by the addition of as a third constant greatly improves its ability to predict vapor pressures and other liquid-phase thermodynamic properties. 

The simulations described above were performed at constant density, i.e., a volume was imposed on the system irrespective of the resulting pressure or chemical potential. MD simulations performed at constant chemical potential, where the confined liquid is in equilibrium with a vapor or bulk liquid phase, have also been performed. Simulations with free surfaces, i.e., with vapor/polymer interfaces, allow for the study of the equilibrium liquid-vapor interface structure and the calculation of the surface tension, a thermodynamic property fundamental to the understanding of the behavior of a material at interfaces. An MD study of the equilibrium liquid-vapor interface structure and surface tension of thin films of n-decane and n-eicosane (C20H42) has been performed in Ref. 26. The system studied consisted of a box with periodic boundary conditions in all directions. The liquid polymer, however, while fully occupying the x and y dimensions, occupied only a fraction of the system in the z direction, resulting in two liquid-vapor interfaces. The liquid phase ranged from about 4.0 to 7.0 nm in thickness. Simulations were performed at 400 K for both decane and eicosane, with additional decane simulations at 300 K. A similar system of tridecane molecules, using a well calibrated EA force field, has been studied at 400 K and 300 K in Ref 32. 

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