Les écarts correspondants obtenus avec la corrélation de Lee et Kesler sont respectivement de 1.41% et 1.35%. p. cr. It has become a standard for the phase characterization of single & pure components. This approach is equally suitable for gases and liquid, giving it a distinct advantage over the simple virial equation of state and most 0000091863 00000 n �z`}�|�t�{�)s��3,dZ�X�°�Q���i1cS+S&S>S�~66�Ō�U�,�82h0,epd8n�Գ�l.�V)����� Ŷ1}bP�{K��)��` >` L�D Perhaps the best correlation of PVT for real gases uses a compressibility factor modified by an acentric factor that was developed by Kenneth Pitzer (“The Volumetric and Thermodynamic Properties of Fluids. 0000092283 00000 n It is a measure of how much the thermodynamic properties of a real gas deviate from those expected of an ideal gas. Determine the molar volume of n-butane @ 510 K and 25 bar by a) Ideal-gas equation b) The generalized compressibility-factor correlation c) The generalized 2 … The extent to which Z differs from 1 is a measure of the extent to which the gas is behaving nonideally. In comparison, volumetric data for 15 compounds were used as the basis for the correlation of Pitzer et al, while 4 compounds were used by Lee and Kesler. Molar mass M kg/mol Boiling temp. Comparison of Benedict—Webb—Rubin, Starling and Lee—Kesler equations of state for use in P—V—T calculations, The Canadian Journal of Chemical Engineering. A titre de comparaison, les données volumétriques ayant servi de base de la corrélation de Pitzer portaient sur 15 composés, tandis que Lee et Kesler ont eu recours à 4 composés. The proposed correlation also yields better results at ω = 0 than those obtained from earlier correlations. where: C = 0000060020 00000 n Z. cr. Working off-campus? 0000048150 00000 n The acentric factor ω is a conceptual number introduced by Kenneth Pitzer in 1955, proven to be very useful in the description of matter. The ω values covered in this work (–0.002 to 0.9065) is also wider than those used by Pitzer et al. The three‐parameter generalized correlation of Pitzer et al (1955) for calculating the compressibility factor Z of normal fluids in the T r and P r regions of 0.8 ≦ T r ≦ 4.0 and 0 ≦ P r ≦ 9.0 has been extended to wider ranges, using the P‐V‐T data available in the literature for 53 compounds with a total number of data points about 15,000. Use the link below to share a full-text version of this article with your friends and colleagues. compressibility factor will not depend on kind of substance, if it is considered as a function of M-factor. 0000044179 00000 n 0000092073 00000 n 0000079093 00000 n The full text of this article hosted at iucr.org is unavailable due to technical difficulties. The three‐parameter generalized correlation of Pitzer et al (1955) for calculating the compressibility factor Z of normal fluids in the Tr and Pr regions of 0.8 ≦ Tr ≦ 4.0 and 0 ≦ Pr ≦ 9.0 has been extended to wider ranges, using the P‐V‐T data available in the literature for 53 compounds with a total number of data points about 15,000. Eq 3.46 where Zoand Z1are tabulated functions of reduced pressure and temperature. The term “acentric factor” comes from Kenneth Pfizer's observation in 1955 that compact and near-spherical molecules have close to zero values when their ω is calculated. 0000038064 00000 n Learn about our remote access options, Department of Chemical Engineering, University of Ottawa, Ottawa, Ontario, Canada. The other state description parameters are molecular weight, critical temperature, critical pressure, and critical volume (or critical compressibility). 0000003435 00000 n endstream endobj 22 0 obj <> endobj 23 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC]/ExtGState<>>>/Type/Page>> endobj 24 0 obj <> endobj 25 0 obj <> endobj 26 0 obj <> endobj 27 0 obj <> endobj 28 0 obj <>stream 0000039760 00000 n � 21 40 The following correlations can be used to estimate these parameters: a = 0.42747 ( )2 c c RT p cb = 0.08664 c RT p m = 0.48508 + 1.55171w - 0.1561w2 a = ( ) 2 1+m 1- T R Example 3.4-4 -----

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