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Application of the Benedict‐Webb‐Rubin equation of state to argon
Author(s) -
Zudkevitch David,
Kaufmann Thomas G.
Publication year - 1966
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690120333
Subject(s) - argon , thermodynamics , equation of state , isothermal process , chemistry , vapor pressure , enthalpy , vapor–liquid equilibrium , superheating , physics , organic chemistry
The coefficients of the Benedict‐Webb‐Rubin equation of state have been developed for argon. By employing these coefficients, the volumetric behavior of argon has been predicted with an average deviation of 0.241% for five hundred ninety‐seven smoothed and experimental data points in the superheated region. At temperatures below the critical, two sets of C o 's, one for the liquid and one for the vapor, were needed to relate the vapor pressure to the densities of saturated argon. However, consistent fugacities for the saturated vapor and liquid argon could not be predicted with these C o values. Therefore, another set of C o 's was developed by equating the pure component vapor and liquid fugacities along the vapor pressure curve. These values were used to test the applicability of the equation of state to predict derived thermodynamic properties. The original BWR expression for calculating isothermal pressure effects on enthalpy was modified to include explicitly the temperature dependence of the coefficient C o . Vapor‐liquid equilibrium relations for the argon‐nitrogen system predicted by the standard BWR procedure were compared with experimental data.