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Volumetric properties of supercritical ethanen-n-heptane mixtures: The isothermal compressibility in the critical region

✍ Scribed by P. Ehrlich; P. C. Wu

Publisher: American Institute of Chemical Engineers
Year: 1973
Tongue: English
Weight: 570 KB
Volume: 19
Category: Article
ISSN: 0001-1541
DOI: 10.1002/aic.690190319

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✦ Synopsis

Abstract

The isothermal compressibility (at constant composition x) k~T,x~, was calculated in the neighborhood of the critical locus for seven mixtures containing 3.5 to 19.6 mole % heptane and analyzed in terms of the reduced pressure variable σ = (P – P̂)/P̂ where P̂ is the pressure at which k~T,x~ becomes very large. The data can be represented by the equation k~T,x~ = const. σ^−λ^ along the critical isotherm and one near it and by the locus P̂(T). λ was found to be a strong function of x. The divergence of the isothermal compressibility of the mixtures near the critical locus is in conflict with predictions from classical equations of state but in accordance with modern concepts of the critical region.

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