Benedict-webb-rubin Equation

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Benedict-webb-rubin Equation

The original BWR

:

P=
ho RT + \left(B_0 RT-A_0 - rac{C_0}{T^2} 
ight) 
ho^2 + \left(bRT-a-rac{d}{T}
ight) 
ho^3 + \alpha  a  
ho^6 + rac{c
ho^3}{T^2}\left(1 + \gamma
ho^2
ight)\exp\left(-\gamma
ho^2
ight)

The BWRS Equation of State

A modification of the Benedict-Webb-Rubin Equation Of State by Professor Kenneth E. Starling of the University of Oklahoma.

:

P=
ho RT + \left(B_0 RT-A_0 - rac{C_0}{T^2} + rac{D_0}{T^3} - rac{E_0}{T^4}
ight) 
ho^2 + \left(bRT-a-rac{d}{T}
ight) 
ho^3 + \alpha\left(a+rac{d}{T}
ight) 
ho^6 + rac{c
ho^3}{T^2}\left(1 + \gamma
ho^2
ight)\exp\left(-\gamma
ho^2
ight)

ρ

Values of the various parameters for 15 substances can be found in:

K.E. Starling, ''Fluid Properties for Light Petroleum Systems.'' Gulf Publishing Company (1973).

REFERENCES

:Benedict, M., Webb, G. B., and Rubin, L. C., "An Empirical Equation for Thermodynamic Properties of Light Hydrocarbons and Their Mixtures: I. Methane, Ethane, Propane, and n-Butane", J. Chem. Phys., Vol. 8, No.4, pp. 334-345 (1940).

:ibid, "II. Mixtures of Methane, Ethane, Propane and n-Butane", J. Chem. Phys., Vol. 10, No. 12, pp. 747 - 758 (1942).
:ibid, "III. Constants for Twelve Hydrocarbons", Chem. Eng. Progr., Vol. 47, No. 8, pp. 419-422 (1951).
:ibid, "IV. Fugacities and Liquid-Vapor Equilibria", Chem. Engr. Progr., Vol. 47, No. 9, pp. 449-454 (1951).