Extension to the three-parameter generalized correlation, and, Some applications to the virial equation of state.

Title: Extension to the three-parameter generalized correlation, and, Some applications to the virial equation of state.
Authors: Hsiao, Eugene Yuh-Jen.
Date: 1977
Abstract: The three-parameter generalized correlation (acentric-factor correlation) of Pitzer et al.{128) (1955) for calculating the compressibility factor of pure compounds in the Tr and Pr regions of 0.8 ≤ Tr ≤ 4.0 and 0 ≤ Pr ≤ 9.0 has been thoroughly examined and then extended to wider ranges. By collecting the P-V-T data of 57 compounds available in the literature with data points in the proximity of 15,000, the proposed form Z = Z(0) + oZ(1) of Pitzer's correlation was found to be appropriate. As a result, values of Z(0) and Z(1) were tabulated at regular intervals of Tr and Pr and with the ranges of applicability extended to 0.2 ≤ Tr ≤ 5.0 and 0 ≤ Pr ≤ 12.0. However, in the final correlation, through verifications, four compounds (hydrogen, helium, ammonia and water) were deleted from this correlation so that the necessity of excluding these compounds with quantum or highly polar nature was also confirmed. This correlation was further tested by first comparing the calculated compressibility factors with the experimental compressibility factor data for 12 compounds with 1,556 data points, and again tested by checking the satisfaction of the boundary condition of this correlation. It was shown that this presentation is not only adequate but also more accurate with improving precision for compressibility factor calculations, when compared with published works. The binary interaction coefficients of binary mixtures have also been studied by the use of the second virial coefficient approach. Using appropriate mixing rules to the second virial coefficient correlation proposed by Pitzer and Curl {129} (1957) for pure compounds in terms of the acentric factor, 493 values of the binary interaction parameters for 121 binary systems were obtained. These values indicate themselves well with the fact that the binary interaction constant is a function of temperature, not universal constant.
URL: http://hdl.handle.net/10393/10717
CollectionTh├Ęses, 1910 - 2005 // Theses, 1910 - 2005
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