Experimental Liquid Densities of n-Pentane, n-Octane, and n-Nonane and Their Binary Mixtures from (273.15 to 363.15) K at 0.1 MPa (original) (raw)
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Experimental measurements and prediction of liquid densities for n-alkane mixtures
The Journal of Chemical Thermodynamics, 2006
We present experimental liquid densities for n-pentane, n-hexane and n-heptane and their binary mixtures from (273.15 to 363.15) K over the entire composition range (for the mixtures) at atmospheric pressure. A vibrating tube densimeter produces the experimental densities. Also, we present a generalized correlation to predict the liquid densities of n-alkanes and their mixtures. We have combined the principle of congruence with the Tait equation to obtain an equation that uses as variables: temperature, pressure and the equivalent carbon number of the mixture. Also, we present a generalized correlation for the atmospheric liquid densities of nalkanes. The average absolute percentage deviation of this equation from the literature experimental density values is 0.26%. The Tait equation has an average percentage deviation of 0.15% from experimental density measurements.
Journal of Chemical & Engineering Data, 2013
We present densities and dynamic viscosities of binary mixtures of n-octane with ethanol, 1-propanol, 1-butanol, and 1-pentanol. Measurements are performed at atmospheric pressure from (293.15 to 323.15) K using a vibrating-tube densimeter and three Cannon−Fenske viscosimeters. We have calculated the excess molar volumes and the viscosity deviations from the experimental measurements. Results have been correlated to Redlich−Kister type equations. from (303.15 to 318.15) K. Feitosa et al. 24 measured them from (273.15 to 298.15) K with increments of 2.5 K. Density measurements for n-octane + 1-propanol at 298.15 K have been reported by Kaur et al., 39 Iglesias et al., 40 Orge et al., 23 and Mato et al. 41 Gupta et al. 42 measured the excess molar volume of this mixture at 303.15 K. Measurements from (293.15 to 308.15) K were performed by Jimeńez et al. 25,43 Densities for the system n-octane + 1-butanol have been measured by Nath 44 at 293.15 K, by Gupta et al. 42 at 303 K, by Nath and Pandey 45 at (288.15 and 298.15) K, by De Cominges et al. 46 from (288.15 to 308.15) K, and by Dubey et al. 26 from (298.15 to 308.15) K. Also, different authors have measured the density of this mixture at 298.15 K. 27,28,39,40,47−49 For the mixture of n-octane + 1-pentanol, several authors 39,40,45,50,51 have measured the liquid density at 298.15 K. Gupta et al. 42 report the excess molar volume for the same mixture at 303.15 K. Experimental measurements of viscosities of n-octane + ethanol have been reported by Orge et al. 23 at 298.15 K. However, Feitosa et al. 24 reported viscosity measurements at
Journal of Solution Chemistry, 2011
Densities of the binary mixture of nonane with decane were measured at temperatures from 283.15 to 353.15 K at atmospheric pressure (0.7 atm). Measurements have been made over the full range of compositions and for the pure compounds by using a vibrating-tube densimeter (VTD). Excess molar volumes have been obtained from these experimental results and were fitted to a Redlich–Kister type expansion. The excess molar volumes exhibit small positive and small negative deviations from ideal behavior in the temperature interval studied. Partial molar volumes and partial molar volumes at infinite dilution have been determined for each component.
Fluid Phase Equilibria, 2011
a b s t r a c t Experimental densities are reported for n-hexadecane, n-octadecane, and n-eicosane at pressures to ∼265 MPa and temperatures of 323.15, 423.15, and 523.15 K. The reported densities are in good agreement with the available literature data that cover limited pressure and temperature ranges. The Peng-Robinson equation of state (PR EOS), a new high-temperature high-pressure volume-translated Soave-Redlich-Kwong equation of state (HTHP-VT SRK EOS), and the perturbed-chain statistical associating fluid theory (PC-SAFT) are used to predict the reported densities. Both the HTHP-VT SRK and PC-SAFT equations exhibit mean absolute percent deviation (MAPD) values of 2.4-1.3% for the densities of all three hydrocarbons while the MAPD values for the PR EOS are all near 16%.
The Journal of Chemical Thermodynamics, 2009
Liquid densities for 2-propanol have been measured at T = (280, 300, 325, 350, 375, and 393) K from about atmospheric pressure up to 10 MPa using a vibrating tube densimeter. The period of vibration has been converted into density using the Forced Path Mechanical Calibration method. The R134a has been used as reference fluid for T 6 350 K and water for T > 350 K. The uncertainty of the measurements is lower than ±0.05%. The measured liquid densities have been correlated with a Starling BWR equation with an overall AAD of 0.025%. The same BWR equation agrees within an AAD lower than 0.2% with the experimental values available in the literature over the same temperature and pressure range.
Journal of Solution Chemistry, 2012
Densities of binary mixtures composed by N,N-dimethylformamide (DMF) and ethanolamine (EA) or N,N-diethylethanolamine (DEEA) were studied. Measurements were made by means of a vibrating tube densimeter (VTD) at temperatures from 293.15 to 313.15 K at atmospheric pressure (73 kPa). Both binary systems were measured over the full range of compositions along with the pure compounds. Excess molar volumes were calculated from the experimental densities, and were fitted to a Redlich-Kister type equation. The excess molar volumes are positive for both systems. Partial molar volumes and partial excess volumes were obtained from the Redlich-Kister equation.
Compressed Liquid Densities of 1Pentanol and 2Pentanol from 313 to 363 K at Pressures to 25 MPa
International Journal of Thermophysics, 2007
Compressed liquid densities of 1-pentanol and 2-pentanol have been measured from 313 to 363 K at pressures to 25 MPa. Measurements have been achieved using a vibrating tube densimeter. Water and nitrogen are the reference fluids to calibrate the densimeter. Measurements uncertainties are estimated to be ±0.03 K for temperatures, ±0.008 MPa for pressures and ±0.20 kg·m−3 for densities. Two volume-explicit equations with five and six parameters and the 11-parameter BWRS equation of state are used to correlate the experimental densities of 1-pentanol and 2-pentanol reported in this work. Statistical values for the evaluation of the correlations are reported. Comparisons with literature data are performed for the temperature and pressure ranges of the measurements.
Liquids
Vapor–liquid equilibrium (VLE) and density data for binary systems of branched alkanes + ethyl acetate are scarce in the literature. In this study, the binary mixtures 3-methylpentane + ethyl acetate and 2,3-dimethylbutane + ethyl acetate were investigated. Density measurements at atmospheric pressure were performed using a vibrating tube density meter at 293.15, 298.15 and 303.15 K. Large and positive excess molar volumes were calculated and correlated using a Redlich–Kister-type equation. Isobaric VLE data at 101.3 kPa were obtained using a Gillespie-type recirculation ebulliometer. Equilibrium compositions were determined indirectly from density measurements. The experimental data were checked for consistency by means of the Fredenslund test and the Wisniak (L-W) test and were then successfully correlated using the NRTL model. The newly studied binary systems display high deviations from ideality and minimum boiling azeotropes, the coordinates of which are reported in this work.
Journal of Chemical & Engineering Data, 2013
A thermodynamic study is carried out on binary systems composed of propyl ethanoate with six alkanes, from pentane to decane. Vapor pressures of the ester and the isobaric vapor−liquid equilibria of these six mixtures were measured at 101.32 kPa in a small-capacity ebulliometer and also the mixing properties y E = v E ,h E over a range of temperatures and at atmospheric pressure. Adequate correlations are drawn for the surfaces y E = y E (x,T) with an interpretation on the behavior of the mixtures and also using c p E data from literature. The mixing processes are all endothermic with a change in the slope direction of the function h E = h E (T) for the binary systems, which all present expansive effects, with v E > 0 and also (∂v E /∂T) p > 0. The results of the different properties are analyzed within a general context of the behavior of ester + alkane systems. A parametric model is used that enables the simultaneous correlation of the experimental values of different thermodynamic properties for each of the systems considered, slightly improving on the representation obtained with the nonrandom two-liquid (NRTL) model. The representation of vapor−liquid equilibrium (VLE) and h E properties with the universal functional activity coefficient (UNIFAC) group contribution model is acceptable, although it does not reflect the change in enthalpies with varying temperature, resulting in an unacceptable estimation of c p E .