Pressure, volume, temperature, and composition measurements and thermodynamic properties of water + n-heptane mixtures in the supercritical region

Abdulagatov, Ilmutdin M.; Базаев, А. Р.; Gasanov, R.K.; Bazaev, E. A.; Ramazanova, A. E.

doi:10.1068/htec13

Cited by 5 publications

(6 citation statements)

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“…The methods and procedures used in this study are the same as those employed previously in the study of pure water, n -alkanes, and water + n -alkane mixtures. ,,− A detailed description of the apparatus and the experimental procedures used for the PVTx measurements has been given previously in our series publications, ,,− and only essential information will be given here. The measurements were made using a constant-volume high-pressure piezometer.…”

Section: Methodsmentioning

confidence: 99%

“…The methods and procedures used in this study are the same as those employed previously in the study of pure water, n-alkanes, and water + n-alkane mixtures. 34,35,[58][59][60][61][62][63][64][65][66] A detailed description of the apparatus and the experimental procedures used for the PVTx measurements has been given previously in our series publications, 34,35,[58][59][60][61][62][63][64][65][66] and only essential information will be given here. The measurements were made using a constant-volume high-pressure piezometer.…”

Section: Methodsmentioning

confidence: 99%

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PVTx Measurements and Crossover Equation of State of Pure n-Hexane and Dilute Aqueous n-Hexane Solutions in the Critical and Supercritical Regions

Abdulagatov

Базаев

Magee

et al. 2005

Ind. Eng. Chem. Res.

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The PVTx relationship of aqueous n-hexane solutions (0.0201, 0.082, and 0.8500 mole fraction of n-hexane) has been measured in the near-critical and supercritical regions with a constantvolume piezometer. Measurements were made on the critical isotherm of pure water 647.1 K with pressures ranging from 8 to 33 MPa. The total uncertainties of density, pressure, temperature, and composition measurements are estimated to be less than 0.16%, 0.05%, 15 mK, and 0.001 mole fraction, respectively. The Krichevskii parameter was estimated (124.4 ( 20 MPa) from direct measurements of the P-x dependence along the critical isotherm-isochore of pure water. The measured PVTx data were used to calculate partial molar volumes at infinite dilution for n-hexane V h 2 ∞ in near-critical water. The asymptotic behavior of the partial molar volume along the solvent's (pure water) critical isotherm-isobar was studied. The molar volume values for the dilute H 2 O + n-C 6 H 14 mixture along the critical isotherm-isochore of pure water were also used to estimate the critical exponent of partial molar volume V h 2 ∞ ∝ x -( ) 0.795 ( 0.001). Using our new PVTx data together with data obtained in other studies, we developed a crossover Helmholtz free-energy model (CREOS) for dilute aqueous n-hexane solutions in wide temperature and pressure ranges around the vapor-liquid critical points. The CREOS model requires only the critical locus as an input and represents all available experimental PVTx data for a dilute H 2 O + n-C 6 H 14 mixture with an average absolute deviation (AAD) of about 0.50-0.65% in the temperature and density ranges 0.98T c (x) e T e 1.15T c (x) and 0.35F c (x) e F e 1.65F c (x), respectively, and concentrations up to 0.05 mole fractions of n-hexane. The accuracy and predictive capability of the crossover model was confirmed by comprehensive comparison of present crossover EOS for the pure n-hexane with the available experimental data in the critical and supercritical regions.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

PVTx Measurements and Crossover Equation of State of Pure n-Hexane and Dilute Aqueous n-Hexane Solutions in the Critical and Supercritical Regions

Abdulagatov

Базаев

Magee

et al. 2005

Ind. Eng. Chem. Res.

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“…The present measurements of the PVT properties for toluene have been performed with a constant-volume method of extracting sample from the piezometer under isothermal conditions. The method of measurements, experimental procedure, and construction of the piezometer have been discussed in detail elsewhere (Abdulagatov et al. − ). A cylindrical piezometer horizontally mounted in the center of an air thermostat was used.…”

Section: Methodsmentioning

confidence: 99%

“…Measurements were carried out on 20 liquid isochores between (791 and 973) kg‚m -3 . The pressure was measured with an uncertainty † This contribution will be part of a special print edition containing papers presented at the Fourteenth Symposium on Thermophysical Properties, Boulder, CO, June [25][26][27][28][29][30]2000. * To whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

PVT Measurements for Toluene in the Near-Critical and Supercritical Regions

et al. 2001

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The PVT relationships of toluene were measured in the near-critical and supercritical regions. Measurements were made using a constant-volume piezometer immersed in a precision thermostat. The volume of the piezometer V PT was corrected for both temperature and pressure expansions. The temperature was measured with a 10 Ω platinum resistance thermometer (PRT-10) with an uncertainty of 10 mK. Pressure was measured by means of a dead-weight gauge with an uncertainty of (0.0015 to 0.002) MPa. Uncertainties of the density measurements are estimated to be (0.05 to 0.10)%, depending on the experimental pressure and temperature. The volume of the piezometer V PT was calibrated using a reference fluid (water) with well-known PVT properties at various temperatures and pressures. Measurements were made along various near-critical and supercritical isotherms between (591 and 673) K at pressures from (4 to 36) MPa. The measured PVT data for toluene were compared with values calculated from equations of state and previous measurements of other authors. The accuracy of the method was confirmed by PVT measurements for pure water in the critical and supercritical regions.

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“…Our (p, v, T, x) apparatus has been described in detail previously [38][39][40][41][42][43][44][45][46][47][48][49]. The apparatus previously was used to measure (p, v, T) properties pure methanol [50] and (H 2 O + CH 3 OH) mixtures [39] in the near-critical and supercritical regions.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

(p,v,T,x) Measurements of {(1−x)H2O+xC2H5OH} mixtures in the near-critical and supercritical regions

Базаев

Abdulagatov

Bazaev

et al. 2007

The Journal of Chemical Thermodynamics

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Pressure, volume, temperature, and composition measurements and thermodynamic properties of water + n-heptane mixtures in the supercritical region

Cited by 5 publications

References 0 publications

PVTx Measurements and Crossover Equation of State of Pure n-Hexane and Dilute Aqueous n-Hexane Solutions in the Critical and Supercritical Regions

PVTx Measurements and Crossover Equation of State of Pure n-Hexane and Dilute Aqueous n-Hexane Solutions in the Critical and Supercritical Regions

PVT Measurements for Toluene in the Near-Critical and Supercritical Regions

(p,v,T,x) Measurements of {(1−x)H2O+xC2H5OH} mixtures in the near-critical and supercritical regions

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