PVTx measurements and partial molar volumes for water–hydrocarbon mixtures in the near-critical and supercritical conditions

Abdulagatov, Ilmutdin M.; Базаев, А. Р.; Bazaev, E. A.; Saidakhmedova, M. B.; Ramazanova, A. E.

doi:10.1016/s0378-3812(98)00300-8

Cited by 30 publications

(17 citation statements)

References 13 publications

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“…The results are shown in Figure 7, where values of A Kr are plotted Plyasunov and Shock (2001b), h Rizvi and Heidemann (1987), i Our calculations of A Kr , j Sassen et al (1990), k At 298 K: ⌬ h G o ϭ 20.98 kJ · mol Ϫ1 (Scharlin and Battino, (1994)), ⌬ h H o ϭ Ϫ14.54 kJ · mol Ϫ1 ; ⌬ h C p o ϭ 268 J · K Ϫ1 · mol Ϫ1 ), l Abdulagatov et al (2001), m Abdulagatov et al (1998), n Heidman et al (1985 (Parker, 1965), t Balakrishnan (1988), u At 298 K: , v At 298 K: , w Lewis and Wetton (1988) (Bergström and Olofsson, 1975), y Anerousis et al (1979), z At 298 K: ⌬ h G o ϭ Ϫ19.7 kJ · mol Ϫ1 , ⌬ h H o ϭ Ϫ78.5 kJ · mol Ϫ1 (preliminary results of our data evaluation); ⌬ h C p o ϭ 358 J · K Ϫ1 · mol Ϫ1 .…”

Section: Applicability Of the Group Contribution Approximation For Thmentioning

confidence: 92%

Prediction of the vapor–liquid distribution constants for volatile nonelectrolytes in water up to its critical temperature

Plyasunov¹,

Shock

2003

Geochimica et Cosmochimica Acta

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Section: Applicability Of the Group Contribution Approximation For Thmentioning

confidence: 92%

Prediction of the vapor–liquid distribution constants for volatile nonelectrolytes in water up to its critical temperature

Plyasunov¹,

Shock

2003

Geochimica et Cosmochimica Acta

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“…The apparatus used for P V T measurements of ethanol is similar to that used in previous papers [49][50][51][52][53][54][55][56][57][58][59] to measure P V T properties of pure methanol, n-alkanes, and their aqueous solutions in the critical and supercritical regions. Detailed descriptions of the apparatus and the experimental procedure, and uncertainty assessment have been described in our previous publications [49][50][51][52][53][54][55][56][57][58][59].…”

Section: Methodsmentioning

confidence: 99%

“…Detailed descriptions of the apparatus and the experimental procedure, and uncertainty assessment have been described in our previous publications [49][50][51][52][53][54][55][56][57][58][59]. The measurements were made using the constant-volume method, with an extraction of the sample from the piezometer under isothermal conditions.…”

Section: Methodsmentioning

confidence: 99%

“…This work is a part of a continuing program on volumetric (PVT) and caloric (C V V T ) property measurements of alcohols and their aqueous solutions in the critical and supercritical regions. The present PVT apparatus has been previously used for accurate measurements on other pure fluids and aqueous solutions in the critical and supercritical regions (Abdulagatov et al [49][50][51][52][53], Bazaev et al [54][55][56][57][58], and Rabezkii et al [59]). …”

Section: Critical Parametersmentioning

confidence: 99%

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PVT Measurements for Pure Ethanol in the Near-Critical and Supercritical Regions

et al. 2007

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The P V T properties of pure ethanol were measured in the near-critical and supercritical regions. Measurements were made using a constant-volume piezometer immersed in a precision thermostat. The uncertainty of the density measurements was estimated to be 0.15%. The uncertainties of the temperature and pressure measurements were, respectively, 15 mK and 0.05%. Measurements were made along various near-critical isotherms between 373 and 673 K and at densities from 91.81 to 497.67 kg · m −3 . The pressure range was from 0.226 to 40.292 MPa. Using two-phase P V T results, the values of the saturated-liquid and -vapor densities and the vapor pressure for temperatures between 373.15 and 513.15 K were obtained by means of an analytical extrapolation technique. The measured P V T data and saturated properties for pure ethanol were compared with values calculated from a fundamental equation of state and correlations, and with experimental data reported by other authors. The values of the critical parameters (T C ,P C ,ρ C ) were derived from the measured values of saturated densities and vapor pressure near the critical point. The derived values of the saturated densities near the critical point for ethanol were interpreted in term of the "complete scaling" theory.

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“…In this connection there has been increased interest in the use of supercritical water (SCW) (temperature T > 647 K and p > 22.1 MPa) as a medium for conversion of lowgrade fuels and recycling of harmful organic compounds. Prospects for the use of SCW are provided by its unique properties [1,2]: high, almost unlimited, solubility of organic compounds and nonpolar gases, in particular, oxygen and low solubility of salts and acids; high density; high (compared to the liquid state) diffusion coefficient, and low viscosity. Even at relatively low temperatures, supercritical water has strong chemical reactivity in the radical type reactions characteristic of combustion.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of a coal particle in flow of a supercritical aqueous fluid

Vostrikov

Dubov

Psarov

et al. 2008

Combust Explos Shock Waves

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A study was made of the conversion of single spherical coal particles of diameter 1-5 mm in a supercritical H 2 O/O 2 fluid with an oxygen mass fraction of 0-6.6% in a semibatch reactor at a pressure of 30 MPa and a temperature of 673-1023 K. A decrease in the particle mass was observed in two parallel processes: gasification of coal with water and oxidation of coal with oxygen. An activation energy 19 ± 7 kJ/mole and a pre-exponential factor 10 −2±0.4 sec −1 were obtained under the assumption of zero order for the concentration H 2 O and an Arrhenius dependence for the rate of gasification with water. The oxidation with oxygen at a temperature above 780 K was found to be limited by the rate of O 2 diffusion to the coal organic matter. Below 780 K, the rate of heterogeneous oxidation with oxygen is described by a first-order reaction for the concentration of O 2 and a zero-order reaction for the concentration of H 2 O with an activation energy of 150 ± 27 kJ/mole and a pre-exponential factor of 10 7.6±1.9 cm 3 /(g · sec).

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PVTx measurements and partial molar volumes for water–hydrocarbon mixtures in the near-critical and supercritical conditions

Cited by 30 publications

References 13 publications

Prediction of the vapor–liquid distribution constants for volatile nonelectrolytes in water up to its critical temperature

Prediction of the vapor–liquid distribution constants for volatile nonelectrolytes in water up to its critical temperature

PVT Measurements for Pure Ethanol in the Near-Critical and Supercritical Regions

Oxidation of a coal particle in flow of a supercritical aqueous fluid

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