Universität zu Köln

Deiters, Ulrich K. ORCID: 0000-0001-7669-5847 and Bell, Ian H. ORCID: 0000-0003-1091-9080 (2020). Unphysical critical curves of binary mixtures predicted with GERG models. International Journal of Thermophysics, 41. p. 169. SPRINGER/PLENUM PUBLISHERS. ISSN 1572-9567

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Abstract

When applied to asymmetric binary mixtures (e.g., methane + pentane or heavier alkanes, hydrogen-containing mixtures), the GERG equation of state (GERG-2004 or GERG-2008) predicts critical curves with physically unreasonable temperature maxima above the critical temperature of the heavier component. These maxima are associated with physically impossible vapor–liquid equilibria. The phenomenon is probably caused by corrections for critical anomalies that were built into the empirical pure-fluid equations of state forming the foundation of the GERG model. These corrections ensure that the model represents thermodynamic data of pure fluids quite well even close to their critical points. For mixtures, however, the corrections can cause artifacts.

Item Type:	Journal Article
Translated title:	Title Language Voraussage unphysikalischer kritischer Kurven durch GERG-Modelle German
Creators:	Creators Email ORCID ORCID Put Code Deiters, Ulrich K. ulrich.deiters@uni-koeln.de orcid.org/0000-0001-7669-5847 UNSPECIFIED Bell, Ian H. ian.bell@nist.gov orcid.org/0000-0003-1091-9080 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-371742
DOI:	10.1007/s10765-020-02743-3
Journal or Publication Title:	International Journal of Thermophysics
Volume:	41
Page Range:	p. 169
Date:	2020
Publisher:	SPRINGER/PLENUM PUBLISHERS
ISSN:	1572-9567
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	Chemistry and allied sciences Technology (Applied sciences)
Uncontrolled Keywords:	Keywords Language asymmetric fluid mixtures English critical curves English GERG equation of state English vapor–liquid equilibria English
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/37174