The Journal of Chemical Thermodynamics | VOL. 32
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Fluid phase equilibria of (carbon dioxide + a 1-alkanol+ an alkane) up to 100 MPa andT=393 K: cosolvency effect, miscibility windows, and holes in the critical surface

Publication Date Sep 1, 2000

Abstract

Phase equilibria phenomena such as cosolvency effects, miscibility windows, and non-critical (liquid + gas) (l.g.) holes in the critical surface in (carbon dioxide + a 1-alkanol + an alkane) were studied up to 100 MPa. In continuation of experiments by Kordikowski and Schneider and Pohler et al., carbon dioxide systems containing a 1-alkanol withm⩽ 10 and an alkane with n⩽ 16 (where m and n denote the number of carbon atoms in the alkyl chains of the 1-alkanol, or the alkane, respectively) were investigated for large cosolvency effects. An isothermal cosolvency effect of 14 MPa has been found in (carbondioxide + 1- octanol + hexadecane) at T = 298 K with additional exhibition of large isobaric miscibility windows. Non-critical l.g. holes in the critical surface are also experimentally established. These l.g. holes in the critical surface, which have already been described as l.g. two-phase holes in the (liquid + liquid + gas) (l.l.g.) three-phase surface by Patton et al. and Peters et al., are now deduced from the occurrence of cosolvency effects when cosolvency lowers the critical surface of a ternary system onto the l.l.g. three-phase surface. This can ultimately lead to a penetration of the l.l.g. three-phase surface by the critical surface with the exhibition of a, mostly closed-loop, critical end point locus as the intersection line, surrounding a non-critical l.g. region. The relation between miscibility windows and holes in the critical surface is illustrated by the examination of systems exhibiting both miscibility w...

Concepts
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Cosolvency Effects
Miscibility Windows
Three-phase Surface
Critical Surface
Cosolvency Effect
Holes In Surface
Carbon Dioxide
Carbon Dioxide Systems
Intersection Line
Carbon Atoms In Chains

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