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Main Title: Diffusion of the carbon dioxide–ethanol mixture in the extended critical region
Author(s): Chatwell, René Spencer
Guevara-Carrion, Gabriela
Gaponenko, Yuri
Shevtsova, Valentina
Vrabec, Jadran
Type: Article
Abstract: The effect of traces of ethanol in supercritical carbon dioxide on the mixture's thermodynamic properties is studied by molecular simulations and Taylor dispersion measurements. This mixture is investigated along the isobar p = 10 MPa in the temperature range between T = 304 and 343 K. Along this path, the mixture undergoes two transitions: First, the Widom line is crossed, marking the transition from liquid-like to gas-like conditions. A second transition occurs from the supercritical gas-like domain to a subcritical gas. The Widom line crossover entails inflection points for most of the studied properties, i.e. density, enthalpy, shear viscosity, Maxwell–Stefan and intradiffusion coefficients. On the other hand, the transition between the super- and subcritical regions is found to be generally smooth, an observation that is qualitatively confirmed by experimental Taylor dispersion measurements. Dedicated atomistic simulations show the presence of microheterogeneities due to ethanol self-association along the investigated path, which lead to the mixture's anomalous behavior in its extended critical region.
Subject(s): carbon dioxide–ethanol mixture
Taylor dispersion measurements
Issue Date: 18-Jan-2021
Date Available: 11-Mar-2021
Language Code: en
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Sponsor/Funder: TU Berlin, Open-Access-Mittel – 2021
Journal Title: Physical Chemistry, Chemical Physics
Publisher: Royal Society of Chemistry
Volume: 23
Issue: 4
Publisher DOI: 10.1039/D0CP04985A
Page Start: 3106
Page End: 3115
EISSN: 1463-9084
ISSN: 1463-9076
TU Affiliation(s): Fak. 3 Prozesswissenschaften » Inst. Prozess- und Verfahrenstechnik » FG Thermodynamik und Thermische Verfahrenstechnik
Appears in Collections:Technische Universität Berlin » Publications

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