Correlation of Constants in the Benedict-Webb-Rubin Equation of State

Canjar, Lawrence N.; Smith, R. F.; Volianitis, Elias; Galluzzo, J. F.; Cabarcos, Manuel

doi:10.1021/ie50545a042

Cited by 12 publications

(9 citation statements)

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“…Pressures calculated from the correlated constants deviated on the average by 0.57% from experimental values (1). Critical pressures were also precisely reproduced.…”

Section: (Bo-bbd) Rt + -T"mentioning

confidence: 65%

Correlation of the constants of the Benedict‐Webb‐Rubin‐Friend equation of state for 2‐methyl paraffins

Griskey¹,

Canjar²

1963

AIChE Journal

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“…Pressures calculated from the correlated constants deviated on the average by 0.57% from experimental values (1). Critical pressures were also precisely reproduced.…”

Section: (Bo-bbd) Rt + -T"mentioning

confidence: 65%

Correlation of the constants of the Benedict‐Webb‐Rubin‐Friend equation of state for 2‐methyl paraffins

Griskey¹,

Canjar²

1963

AIChE Journal

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“…In the case of this research, the constants used for the B-W-R equation of state were obtained from the literature. The constants for methane, isopentane, and n-pentane were reported by Benedict et al (3) and for neopentane by Canjar et al (6).…”

Section: Rt Inmentioning

confidence: 77%

“…Vapor and liquid samples are removed from the equilibrium cell and contained by means of pressure locks. Each lock is made up of two valves (valves 5,6,7,8 in Figure 1) and a 6-in. nipple, 14-in.…”

Section: Equipmentmentioning

confidence: 99%

Vapor-liquid equilibriums in methane-hydrocarbon systems

Williams¹,

Prodany²

1971

J. Chem. Eng. Data

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Experiment determinations of the compositions of coexisting liquid and vapor phases were made for these systems: methane-n-pentane, methane-isopentane, methaneneopentane, methane-isopentane-n-pentane, and methane-neopentane-n-pentane. The pressures and temperatures covered the ranges of 300-500 psia to critical pressures of about 2500 psia and from 160°to 280°F. Experiments were made in a fixedvolume stirred cell. Samples of the phases were analyzed by chromatograph. A correlation employing the B-W-R equation of state to predict vapor phase fugacity coefficients, Hildebrand's regular solution theory, and a modified form of the Chao-Seader expression to calculate the liquid phase fugacity coefficient is presented. Comparison of observed with calculated K values indicates an average absolute percent deviation within 10%.

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“…The merits and limitations of fourteen of the most common equations of state are thoroughly discussed for the subcritical, critical, and hypercritical regions of argon and n-butane. The discussion will assist designers and experimenters to select the best equations for their own applications Attempts to correlate the constants of the Benedict-Webb-Rubin equation of state have been made only for hydrocarbons by Canjar et al (8). For the constants of the Beattie-Bridgeman equation, Maron and Turnbull (77) have proposed a correlation which involves the use of the critical constants of that substance and the Beattie-Bridgeman constants of a reference substance, such as nitrogen.…”

mentioning

confidence: 99%

A Comparison of Equations of State

Shah¹,

Thodos²

1965

Ind. Eng. Chem.

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Since the classical work of van der Waals in 1873, a large number of equations of state have appeared in the literature. Their degree of complexity, as indicated by the number of constants, has been deliberately increased to better represent the PVT behavior of substances over wide ranges of temperature and pressure. In this respect, the equation of state proposed by Martin and Hou (75) requires nine constants to predict the PVT behavior of a substance. Similarly, the Benedict-Webb-Rubin equation ( 6) requires eight constants, while the Bcattie-Bridgeman equation (7, 2) uses five constants to predict the PVT behavior of a substance for conditions for which the constants are calculated. More recently, an equation of state has been suggested by Pings and Sage (23), in the form of an orthogonal polynomial. These equations have received considerable attention over recommended ranges of temperature and pressure. For instance, the Benedict-Webb-Rubin equation is claimed to be reliable for twice the critical density (<5). Although these equations are logically developed from well known thermodynamic principles, their application is frequently limited by the inaccessibility of the constants for the PVT conditions of interest.Establishing these constants is frequently a lengthy process, requiring curve fitting and trial-anderror procedures. For instance, in establishing the constants of the Benedict-Webb-Rubin equation, ten distinct steps are required, two of which involve trial-and-error and curve fitting. What appears to be limiting is the fact

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Correlation of Constants in the Benedict-Webb-Rubin Equation of State

Cited by 12 publications

References 0 publications

Correlation of the constants of the Benedict‐Webb‐Rubin‐Friend equation of state for 2‐methyl paraffins

Correlation of the constants of the Benedict‐Webb‐Rubin‐Friend equation of state for 2‐methyl paraffins

Vapor-liquid equilibriums in methane-hydrocarbon systems

A Comparison of Equations of State

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