Density Measurements of Styrene Solutions in Supercritical CO<sub>2</sub>

Dai, H. J.; Simonson, J.M.; Cochran, H. D.

doi:10.1021/je010116q

Cited by 6 publications

(9 citation statements)

References 8 publications

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“…Density is an important property required in a wide range of engineering disciplines as well as in the determination of different fluid properties. The densities of pure compounds − and binary mixtures ,,− have been investigated by lots of researchers using a vibrating tube densimeter. Although the vibrating tube densimeter is one of the most popular methods for density measurement, it is only suitable for low temperature density measurements, and its accuracy is affected by the viscosity of fluids.…”

Section: Introductionmentioning

confidence: 99%

Density Measurements of Endothermic Hydrocarbon Fuel at Sub- and Supercritical Conditions

et al. 2011

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The density of a typical endothermic hydrocarbon fuel (RP-3) at sub- and supercritical conditions is measured using a novel density measurement method which is based on mass conservation equation and can be applied to the density measurement of single phase flow including supercritical fluids. The measurement covers the temperature range of (295 to 796) K under pressures from (0.1 to 5) MPa. The uncertainty of the measurement is within ± 0.635 % according to error analysis. The results are fitted as polynomials to analyze deviations. For the 265 experimental data points, the average absolute deviation (AAD) and the maximum absolute deviation (MAD) are 0.539 % and 3.29 %, respectively. In addition, the isobaric thermal expansion α P is derived from the fitted values of density.

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Section: Introductionmentioning

confidence: 99%

Density Measurements of Endothermic Hydrocarbon Fuel at Sub- and Supercritical Conditions

et al. 2011

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“…For example, pressurecomposition isotherms of the styrene + CO 2 system were determined in the temperature range of (308.2 to 373.2) K. 13 Density of styrene + CO 2 solution with a wide concentration range from (0.65 to 29.9) mol % were measured isothermally at different temperatures and pressures. 14 Vapor-liquid equilibrium data of the ethylbenzene + CO 2 , styrene + CO 2 , and ethylbezene + styrene + CO 2 systems were studied at (308, 318, and 328) K over a pressure range from (1.4 to 8.4) MPa. 15 In this work, we focused on the systematic investigation on the phase behaviors of the binary and ternary mixtures with the CO 2 concentration ranging from (89.6 to 97.9) mol %, including the critical points, bubble points, and dew points at different temperatures and pressures.…”

Section: Introductionmentioning

confidence: 99%

“…For example, pressure−composition isotherms of the styrene + CO 2 system were determined in the temperature range of (308.2 to 373.2) K . Density of styrene + CO 2 solution with a wide concentration range from (0.65 to 29.9) mol % were measured isothermally at different temperatures and pressures . Vapor−liquid equilibrium data of the ethylbenzene + CO 2 , styrene + CO 2 , and ethylbezene + styrene + CO 2 systems were studied at (308, 318, and 328) K over a pressure range from (1.4 to 8.4) MPa …”

Section: Introductionmentioning

confidence: 99%

Phase Behaviors, Density, and Isothermal Compressibility of Styrene + CO₂, Ethylbenzene + CO₂, and Ethylbezene + Styrene + CO₂ Systems

et al. 2005

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The critical points, bubble points, and dew points of ethylbenzene + CO 2 , styrene + CO 2 , and ethylbezene + styrene + CO 2 mixtures were measured in CO 2 -rich region, and the density of the mixtures were also determined. For all the mixtures, the critical temperatures and critical pressures increase with the decrease of CO 2 concentration in the concentration range studied. The phase separation pressures of the mixtures increased with increasing temperature at a fixed composition, but at constant temperature the phase separation pressures decreased as the CO 2 mole fraction in the mixtures was reduced. The Peng-Robinson equations of state was used to calculate the critical points, bubble points, and dew points parameters. The results agreed reasonably with the experimental data. The isothermal compressibility (K T ) of the mixtures was also investigated. It is demonstrated that the trend of K T to pressure varies slowly as the pressure is far from the phase separation points. However, K T is sensitive to pressure and reaches the maximum as the pressure approaches to the phase separation points. At the critical temperatures, K T varies more significantly with pressure than that at bubble points and dew points.

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“…[20][21][22]30 The densities of pure substances 18−20 and mixtures 3,21−29 have been investigated by many researchers. Dai et al 20,21 measured the density of the mixture of CO 2 and styrene at 313/323/333/ 343 K with a maximum pressure of 34.47 MPa. Yun et al 22 measured the density of the binary mixture of ethane and its cosolvent.…”

Section: Introductionmentioning

confidence: 99%

“…Density is an important property parameter in scientific and engineering applications. The measurement method of the density is divided into two categories: one is the direct measurement based on the relationship of quality and volume , and the other one is the indirect measurement based on the relationship of density and other physical quantities. − , The densities of pure substances − and mixtures ,− have been investigated by many researchers. Dai et al , measured the density of the mixture of CO 2 and styrene at 313/323/333/343 K with a maximum pressure of 34.47 MPa.…”

Section: Introductionmentioning

confidence: 99%

Density Measurements of Propellant EHF-TU at (3 to 7) MPa Supercritical Pressures

Wen

Zhang

et al. 2018

J. Chem. Eng. Data

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Endothermic Hydrocarbon Fuel-Tianjin University (EHF-TU) is one advanced propellant and fractionated from RP-3 extensively used in China. The density of propellant EHF-TU at supercritical pressures is measured using the flow conservation method. The measurement covers temperatures from (303 to 765) K and pressures of (3 to 7) MPa using three tubes with different sizes, and the density varies from (759 to 134) kg•m −3 . The n-decane is used for calibration, and the relative uncertainty of density measurement is 1.1%. A series of measures were adopted to improve the measurement accuracy including flexible sizes of test tubes, the lumped parameter method, and the advanced data process. The results indicate that density decreases with the decline of temperature and pressure. Dramatic variation of density occurs in the pseudocritical region at 3 MPa pressure. Density data is fitted using polynomials, and the average absolute deviation (AAD) between the experimental data and the fitted data is 0.7%. Additionally, the volumetric thermal expansion coefficient of EHF-TU is calculated using the polynomials.

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Density Measurements of Styrene Solutions in Supercritical CO₂

Cited by 6 publications

References 8 publications

Density Measurements of Endothermic Hydrocarbon Fuel at Sub- and Supercritical Conditions

Density Measurements of Endothermic Hydrocarbon Fuel at Sub- and Supercritical Conditions

Phase Behaviors, Density, and Isothermal Compressibility of Styrene + CO₂, Ethylbenzene + CO₂, and Ethylbezene + Styrene + CO₂ Systems

Density Measurements of Propellant EHF-TU at (3 to 7) MPa Supercritical Pressures

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Density Measurements of Styrene Solutions in Supercritical CO2

Cited by 6 publications

References 8 publications

Density Measurements of Endothermic Hydrocarbon Fuel at Sub- and Supercritical Conditions

Density Measurements of Endothermic Hydrocarbon Fuel at Sub- and Supercritical Conditions

Phase Behaviors, Density, and Isothermal Compressibility of Styrene + CO2, Ethylbenzene + CO2, and Ethylbezene + Styrene + CO2 Systems

Density Measurements of Propellant EHF-TU at (3 to 7) MPa Supercritical Pressures

Contact Info

Product

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Density Measurements of Styrene Solutions in Supercritical CO₂

Phase Behaviors, Density, and Isothermal Compressibility of Styrene + CO₂, Ethylbenzene + CO₂, and Ethylbezene + Styrene + CO₂ Systems