Universität zu Köln

Imre, Attila R. ORCID: 0000-0003-4604-5899, Quinones-Cisneros, Sergio E. ORCID: 0000-0002-2872-5033 and Deiters, Ulrich K. ORCID: 0000-0001-7669-5847 (2015). Adiabatic Processes in the Vapor-Liquid Two-Phase Region. 2. Binary Mixtures. Ind. Eng. Chem. Res., 54 (25). S. 6559 - 6569. WASHINGTON: AMER CHEMICAL SOC. ISSN 0888-5885

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Abstract

The phase equilibrium conditions and entropy balance equations for multicomponent fluid mixtures are expressed with a density-based formalism (isochoric thermodynamics), and isentropes in the one- and two-phase region are computed from equations of state; here the Peng-Robinson equation is used as an example. Griffiths theorem-one- and two-phase isentropes meet at a maxcondenbar point (pressure maximum of an isopleth) with equal slopes-could be confirmed. For chemically similar compounds at subcritical conditions, the resulting isentrope patterns are similar to those of pure fluids. If one of the components is supercritical, it is possible that, along a part of a two-phase isentrope, the liquid phase has a higher molar entropy than the vapor phase (entropic inversion). The phenomenon not only poses a numerical problem, but is also relevant for the question whether a two-phase isentrope can run into the llg three-phase curve.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Imre, Attila R. UNSPECIFIED orcid.org/0000-0003-4604-5899 UNSPECIFIED Quinones-Cisneros, Sergio E. UNSPECIFIED orcid.org/0000-0002-2872-5033 UNSPECIFIED Deiters, Ulrich K. UNSPECIFIED orcid.org/0000-0001-7669-5847 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-399641
DOI:	10.1021/acs.iecr.5b01247
Journal or Publication Title:	Ind. Eng. Chem. Res.
Volume:	54
Number:	25
Page Range:	S. 6559 - 6569
Date:	2015
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	0888-5885
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 EQUATION-OF-STATE; PHASE-EQUILIBRIA; FLUID MIXTURES; SYSTEMS; HEAT Multiple languages Engineering, Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/39964