Vapor-liquid equilibrium in the system carbon dioxide + cyclopentane from 275 to 493 K at pressures to 12.2 MPa

Shah, Nilesh N.; Zollweg, John A.; Streett, William B.

doi:10.1021/je00002a014

Cited by 29 publications

(10 citation statements)

References 6 publications

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“…For the data converted to the ITS-90 temperature scale, the optimi- '-'S :::':::0.005% Shah ('f al. 105 1991 276+293 ±20 :::':::0.5% Yurttas et al lOs " 1994 230-280 :::' :::3 :::': 59 " 1994 304 Figure 3 shows both the good agreement between the data sets marked as group 1 and group 2 data and the representation of the data measured by Duschek et al 58 Considering the experimemal uncenaimy of (hese data, (he uncenaimy of Eq. (3.13) is estimated to be APs~::t 0.012% for the whole temperature range.…”

Section: Vapor Pressurementioning

confidence: 69%

A New Equation of State for Carbon Dioxide Covering the Fluid Region from the Triple-Point Temperature to 1100 K at Pressures up to 800 MPa

Span

Wagner

1996

Journal of Physical and Chemical Reference Data

4,037

2,608

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This work reviews the available data on thermodynamic properties of carbon dioxide and presents a new equation of state in the form of a fundamental equation explicit in the Helmholtz free energy. The function for the residual part of the Helmholtz free energy was fitted to selected data of the following properties: (a) thermal properties of the single-phase region (ppT) and (b) of the liquid-vapor saturation curve (Ps> p', p") including the Maxwell criterion, (c) speed of sound w and (d) specific isobaric heat capacity c p of the single phase region and of the saturation curve, (e) specific isochoric heat capacity c v' (f) specific enthalpy h, (g) specific internal energy u, and (h) Joule-Thomson coefficient /-t. By applying modern strategies for the optimization of the mathematical form of the equation of state and for the simultaneous nonlinear fit to the data of all these properties, the resulting formulation is able to represent even the most accurate data to within their experimental uncertainty. In the technically most important region up to pressures of 30 MPa and up to temperatures of 523 K, the estimated uncertainty of the equation ranges from ± 0.03% to ± 0.05% in the density, ± 0.03% to ± 1 % in the speed of sound, and ± 0.15% to ± 1.5% in the isobaric heat capacity. Special interest has been focused on the description of the critical region and the extrapolation behavior of the formulation. Without a complex coupling to a scaled equation of state, the new formulation yields a reasonable description even of the caloric properties in the immediate vicinity of the critical point. At least for the basic properties such as pressure, fugacity, and enthalpy, the equation can be extrapolated up to the limits of the chemical stability of carbon dioxide. Independent equations for the vapor pressure and for the pressure on the sublimation and melting curve, for the saturated liquid and vapor densities, and for the isobaric ideal gas heat capacity are also included. Property tables calculated from the equation of state are given in the appendix.

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Section: Vapor Pressurementioning

confidence: 69%

A New Equation of State for Carbon Dioxide Covering the Fluid Region from the Triple-Point Temperature to 1100 K at Pressures up to 800 MPa

Span

Wagner

1996

Journal of Physical and Chemical Reference Data

4,037

2,608

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“…Comparison of experimental data from refs , and calculation results by two models for the CO 2 –cyclopentane system.…”

Section: Results and Discussionmentioning

confidence: 99%

Estimation and Correlation of Phase Equilibrium of CO₂–Hydrocarbon Systems with PRMHV2-UNIFAC and PRMHV2-NRTL Models

Gao

2020

J. Chem. Eng. Data

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In this work, the Peng–Robinson (PR) equation of state (EoS) and MHV2 mixing rule that were combined with UNIFAC and NRTL G E models were used to predict vapor–liquid phase equilibrium (VLE) data for CO2–hydrocarbon systems. These systems included 12 binary systems and three ternary systems. The PRMHV2-UNIFAC model was used to calculate the bubble pressure, and the average absolute relative deviations (AARD %) were 17.49–32.20% for 12 binary systems. For the PRMHV2-NRTL model, the binary interaction parameters of the NRTL model dependent on temperature were regressed based on the binary VLE data. These new interaction parameters were used to estimate CO2–hydrocarbon VLE data for binary and ternary systems. The bubble pressure was predicted by the PRMHV2-NRTL model, and the AARD % values were 1.52–9.44% for binary systems, which were lower than the value of the PRMHV2-UNIFAC model. The PRMHV2-UNIFAC and PRMHV2-NRTL models were also used to calculate the liquid phase mole fraction of CO2–hydrocarbon ternary systems, and the average absolute deviations (AAD %) were less than 20.70 and 8.54%, respectively.

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“…The critical pressure was determined from the final equation of state as a calculated property at the critical temperature and density. The values are The value of the critical pressure differs by 40 kPa from the two other available values from the group of Kay, and is based in part on the vapor pressure data of Shah et al 14 Additional measurements of the vapor pressure at temperatures near the critical point are needed to reduce the uncertainty given above. The selected triple-point temperature is 179.7 K, as reported by Douslin and Huffman 15 and Aston et al 16 The molar mass is 70.1329 g/mol, which was calculated from the atomic weights of the elements given by Wieser and Berglund.…”

Section: Fundamental Equation Of Statementioning

confidence: 99%

“…Fitting these data caused the errors in the values of c p and c p 0 to increase, and they were thus not included in the fit. The data of Shah et al 14 are the only data above 340 K, but are scattered and were not much help in the development of the equation of state.…”

Section: Experimental Data and Comparisons To The Equations Of Statementioning

confidence: 99%

Speed of Sound Measurements and a Fundamental Equation of State for Cyclopentane

2015

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The speed of sound in liquid cyclopentane has been measured in the temperature range from (258 to 353) K at pressures up to 30 MPa (42 data points) using a pulse-echo method with a double path type sensor. The expanded overall uncertainty (k = 2) in the speed of sound measurements is estimated to be 0.2 %. A function for the speed of sound with inputs of temperature and pressure has been fitted to the experimental results. The new speed of sound data along with available literature data were used to develop a fundamental Helmholtz equation of state for cyclopentane. Typical expanded uncertainties of properties calculated using the new equations are 0.2 % in density in the liquid phase, 1 % in heat capacity, 0.2 % in liquid-phase sound speed, and 0.5 % in vapor pressure. The equation of state is valid from the triple-point temperature, 179.7 K, to temperatures of 550 K with pressures to 250 MPa.

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Vapor-liquid equilibrium in the system carbon dioxide + cyclopentane from 275 to 493 K at pressures to 12.2 MPa

Cited by 29 publications

References 6 publications

A New Equation of State for Carbon Dioxide Covering the Fluid Region from the Triple-Point Temperature to 1100 K at Pressures up to 800 MPa

A New Equation of State for Carbon Dioxide Covering the Fluid Region from the Triple-Point Temperature to 1100 K at Pressures up to 800 MPa

Estimation and Correlation of Phase Equilibrium of CO₂–Hydrocarbon Systems with PRMHV2-UNIFAC and PRMHV2-NRTL Models

Speed of Sound Measurements and a Fundamental Equation of State for Cyclopentane

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Vapor-liquid equilibrium in the system carbon dioxide + cyclopentane from 275 to 493 K at pressures to 12.2 MPa

Cited by 29 publications

References 6 publications

A New Equation of State for Carbon Dioxide Covering the Fluid Region from the Triple-Point Temperature to 1100 K at Pressures up to 800 MPa

A New Equation of State for Carbon Dioxide Covering the Fluid Region from the Triple-Point Temperature to 1100 K at Pressures up to 800 MPa

Estimation and Correlation of Phase Equilibrium of CO2–Hydrocarbon Systems with PRMHV2-UNIFAC and PRMHV2-NRTL Models

Speed of Sound Measurements and a Fundamental Equation of State for Cyclopentane

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Estimation and Correlation of Phase Equilibrium of CO₂–Hydrocarbon Systems with PRMHV2-UNIFAC and PRMHV2-NRTL Models