Der zweite Virialkoeffizient und der Viskositätskoeffizient von Cyclohexandampf

Bich, Eckard; Opel, G.; Pietsch, R.; Schmal, Rodolfo; Vogel, E.

doi:10.1515/zpch-1984-26512

Cited by 12 publications

(4 citation statements)

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“…Comparison 5 of BACKONE results for p s , ρ‘, and ρ‘ ‘ with the reference equation from Penocello et al shows excellent agreement. Homogeneous liquid densities and low-pressure gas densities are also in very good agreement with experimental data. , …”

Section: Thermodynamic Properties Of Pure Componentssupporting

confidence: 76%

Accurate Thermodynamic Properties from the BACKONE Equation for the Processing of Natural Gas

Wendland¹,

Saleh²,

Fischer³

2004

Energy Fuels

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To optimize the processing of natural gas, accurate thermodynamic data are required. Here, we investigate the quality of the physically based BACKONE equation of state, which requires only 3-5 substance specific parameters for each pure component. For mixtures, only one mixture parameter for each binary and no ternary parameters are required. First, for 23 pure components (including ethylene, propylene, hydrogen sulfide, and water), the BACKONE parameters are given and the quality of the predictions for these 23 substances is described. Some characteristic results for properties such as vapor pressure, bubble and dew point density, as well as densities and caloric data, are presented. Second, for 21 key mixtures, the phase equilibria, densities, and caloric data are considered. Finally, we address liquefaction in three stages, considering vapor compression refrigeration cycles and isenthalpic expansion. By comparison with reference equations of state or experimental data, it turns out that, in all cases, the BACKONE equation yields good to excellent predictions of the thermodynamic properties not only for pure fluids but also for mixed natural gases and processing fluids. As a byproduct, we find better coefficients of performance for the first stage refrigeration cycle for n-butane and isobutane or their mixtures with propane as refrigerants, in comparison with pure propane. † Dedicated to Professor Friedrich Kohler, Ruhr-Universita ¨t Bochum, on the occasion of his 80th birthday.

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Section: Thermodynamic Properties Of Pure Componentssupporting

confidence: 76%

Accurate Thermodynamic Properties from the BACKONE Equation for the Processing of Natural Gas

Wendland¹,

Saleh²,

Fischer³

2004

Energy Fuels

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“…The values calculated with the equations of state by Span and Wagner 4 and Penoncello et al 5 show an opposite trend at low temperatures. The data reported by Bich et al 181 deviate from the data reported by Barkan. 180 The equation of state represents second virial coefficients generally within 10 cm 3 mol À1 above 500 K, and 30 cm 3 mol À1 at lower temperatures.…”

Section: Comparisons With Prt Data and Virial Coefficientsmentioning

confidence: 61%

An Equation of State for the Thermodynamic Properties of Cyclohexane

Zhou¹,

Li²,

Penoncello

et al. 2014

Journal of Physical and Chemical Reference Data

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An equation of state for cyclohexane has been developed using the Helmholtz energy as the fundamental property with independent variables of density and temperature. Multiproperty fitting technology was used to fit the equation of state to data for prT, heat capacities, sound speeds, virial coefficients, vapor pressures, and saturated densities. The equation of state was developed to conform to the Maxwell criteria for two-phase vaporliquid equilibrium states, and is valid from the triple-point temperature to 700 K, with pressures up to 250 MPa and densities up to 10.3 mol dm À3 . In general, the uncertainties (k ¼ 2, indicating a level of confidence of 95%) in density for the equation of state are 0.1% (liquid and vapor) up to 500 K, and 0.2% above 500 K, with higher uncertainties within the critical region. Between 283 and 473 K with pressures lower than 30 MPa, the uncertainty is as low as 0.03% in density in the liquid phase. The uncertainties in the speed of sound are 0.2% between 283 and 323 K in the liquid, and 1% elsewhere. Other uncertainties are 0.05% in vapor pressure and 2% in heat capacities. The behavior of the equation of state is reasonable within the region of validity and at higher and lower temperatures and pressures. A detailed analysis has been performed in this article. Ó 2014 by the U.S. Secretary of Commerce on behalf of the United States. All rights reserved. [http://dx.doi.

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“…[6]. Analogously, the viscosity coefficient of cyclohexane was also previously measured by Bich et al [43]. Vogel et al [41] had assessed these series of measurements, whereas Vogel [6] finally discussed them.…”

Section: Results Of the Re-evaluated Measurementsmentioning

confidence: 77%