Benedict - Webb - Rubin

Other pressure—volume—temperature (PVT) relationships may be found in the Hterature ie, Benedict, Webb, Rubin equations of state (4—7) the Benedict, Webb, Rubin, Starling equation of state (8) the Redlich equation of state (9) and the Redlich-Kwong equation of state (10). [Pg.122]

Cubic equations, although simple and able to provide semiquantitative descriptions of real fluid behavior, are not generally useful for accurate representation of volumetric data over wide ranges of T and P. For such appHcations, more comprehensive expressions with large numbers of adjustable parameters are needed. 7h.e simplest of these are the extended virial equations, exemplified by the eight-constant Benedict-Webb-Rubin (BWR) equation of state (13) ... [Pg.485]

An example of a more complex equation that exhibits better accuracy is the Benedict-Webb-Rubin equation ... [Pg.240]

Benedict/Webb/Rubin Equation of State The BWR equation of state with Z as the dependent variable is written... [Pg.531]

As discussed in Sec. 4, the icomplex function of temperature, pressure, and equilibrium vapor- and hquid-phase compositions. However, for mixtures of compounds of similar molecular structure and size, the K value depends mainly on temperature and pressure. For example, several major graphical ilight-hydrocarbon systems. The easiest to use are the DePriester charts [Chem. Eng. Prog. Symp. Ser 7, 49, 1 (1953)], which cover 12 hydrocarbons (methane, ethylene, ethane, propylene, propane, isobutane, isobutylene, /i-butane, isopentane, /1-pentane, /i-hexane, and /i-heptane). These charts are a simplification of the Kellogg charts [Liquid-Vapor Equilibiia in Mixtures of Light Hydrocarbons, MWK Equilibnum Con.stants, Polyco Data, (1950)] and include additional experimental data. The Kellogg charts, and hence the DePriester charts, are based primarily on the Benedict-Webb-Rubin equation of state [Chem. Eng. Prog., 47,419 (1951) 47, 449 (1951)], which can represent both the liquid and the vapor phases and can predict K values quite accurately when the equation constants are available for the components in question. [Pg.1248]

The existing equations of state (i.e., Benedict-Webb-Rubin (BWR), Soave-Redlich-Kwang, and Peng-Robinson) have some practical limitations. The equations of state developed by the University of Illinois... [Pg.73]

Presently, sophisticated computer programs are available based on properties published by various scientific organizations. These programs are normally based upon the equations of state derived by Benedict Webb-Rubin [4] and Starling [5] for use with hydrocarbons. Modifit i-... [Pg.425]

Enthalpy variati an axial, 229 Entropy, 29, 31, 35 Exiuations of state, 26, 27 Benedict-Webb-Rubin BWR), 26... [Pg.545]

Benedict-Webb-Rubin equation 252. 256-7 benzene, vapor pressure 260-1 benzene + I, 4-dimethylbenzene mixture, phase equilbria 420-2, 424... [Pg.655]

The need for methods of accurately describing the thermodynamic behavior of natural and synthetic gas systems has been well established. Of the numerous equations of state available, three--the Soave-Redlich-Kwong (SRK) (19), the Peng-Robinson (PR) (18) and the Starling version of the Benedict-Webb-Rubin (BWRS) (13, 20)--have satisfied this need for many hydrocarbon systems. These equations can be readily extended to describe the behavior of synthetic gas systems. At least two of the equations (SRK and PR) have been further extended to describe the thermodynamic properties of water-light hydrocarbon systems. [Pg.333]

Benedict equation of etate phys chem An empirical equation relating pressures, temperatures, and volumes for gases and gas mixtures superseded by the Benedict-Webb-Rubin equation of state. ben-3,dikt i kwa-zhsn 3v stat ... [Pg.39]

The van der Waals equation is not a particularly accurate tool for prediction of compressibility Z, but it is the first theory to illuminate the nature of the attractive and repulsive forces that lead to departure from the perfect gas law. There are many more accurate equations of state that use more parameters, including the Benedict-Webb-Rubin equation, the Redlich-Kwong equation, and the Peng-Robinson equation. The compressibility factor can also be expanded into the virial form... [Pg.131]

PREDICTIONS BY CORRELATIONS 1 81 And the Benedict-Webb-Rubin equation has many more parameters ... [Pg.181]

Benedict-Webb-Rubin (deton) equation of state 4D274... [Pg.485]

Equations of state (detonation and expin), listing of Abel, Allan, Beattie-Bridgeman, Becker, Becker-Kistiakowsky-Wilson, Benedict-Webb-Rubin, Berthelot, Boltzman, Brinkley-Wilson, Caldirola Paterson, Callendar,... [Pg.599]

The development of mixture rules will be discussed in detail in connection with the Benedict-Webb-Rubin equation of state. [Pg.136]

Other researchers examined the deviations of the Benedict-Webb-Rubin constants with pressure, temperature, and molar volume.12 Equations with as many as 20 empirical constants were developed. Although... [Pg.139]

ENGINEERING, CHEMICALDATACORRELATION] (Vol9) Benedict-Webb-Rubin relationship... [Pg.95]

These methods make use of available experimental knowledge combined with correlation techniques that may or may not be partially based on molecular concepts. They range from methods that are completely empirical to ones in which there is significant input from statistical mechanics (see Fig. 2). As an example of an approach that is almost fully empirical, one can cite the many modifications of the Benedict-Webb-Rubin equation of... [Pg.127]

Benedict/Webb/Rubin, 84 cubic, 80-84, 475-482, 487-493 fugadty coefficients from, 340-343, 472, 475 generalized, 85... [Pg.361]

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