Universität zu Köln

Deiters, Ulrich K. ORCID: 0000-0001-7669-5847 and Bell, Ian H. (2020). Unphysical Critical Curves of Binary Mixtures Predicted with GERG Models. Int. J. Thermophys., 41 (12). NEW YORK: 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
Creators:	Creators Email ORCID ORCID Put Code Deiters, Ulrich K. UNSPECIFIED orcid.org/0000-0001-7669-5847 UNSPECIFIED Bell, Ian H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-314667
DOI:	10.1007/s10765-020-02743-3
Journal or Publication Title:	Int. J. Thermophys.
Volume:	41
Number:	12
Date:	2020
Publisher:	SPRINGER/PLENUM PUBLISHERS
Place of Publication:	NEW YORK
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:	no entry
Uncontrolled Keywords:	Keywords Language PHASE-EQUILIBRIA; TECHNICAL APPLICATIONS; HYDROCARBON SYSTEMS; STATE; EQUATIONS; TEMPERATURES; PRESSURES; BEHAVIOR; NONPOLAR; RANGE Multiple languages Thermodynamics; Chemistry, Physical; Mechanics; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/31466