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• Braz. J. Chem. Eng. 14 (1) • Mar 1997 • https://doi.org/10.1590/S0104-66321997000100003   copy

A DATA BANK OF PARAMETERS FOR THE ATTRACTIVE COEFFICIENT OF THE PENG-ROBINSON EQUATION OF STATE

A data bank of parameters for two expressions for the temperature-dependence of the attractive coefficient, <FONT FACE="Symbol">a</font> (T), of the Peng-Robinson equation of state was compiled for 468 pure substances of varied polarity. The performances of the two expressions, a two-parameter form by Melhem et al. (1989) and a three-parameter form by Almeida et al. (1991) were compared through the root mean square (rms) and maximum (max) deviations in the prediction of the vapor pressure for these substances. The results show the superiority of the three-parameter form

Attractive coefficient; PR equation of state; three-parameter <FONT FACE=Symbol>a</font> (T) form

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