Issue 9, 2008

High-pressure phase behavior of ternary mixtures with ionic liquids, part I: the system bmim[BF4]+4-isobutylacetophenone + CO2

Abstract

Performing reactions in a homogeneous system is extremely important for the achievement of high reaction rates and yield. Since carbon dioxide can tune the miscibility of ionic liquid/organic mixtures, measurements on the phase behavior of these systems provide useful information for the selection of operational conditions for reactions and extractions. We investigated the phase behavior of ternary mixtures of the type bmim[BF4] + solute + CO2, in which the solute is an intermediary in the synthesis of ibuprofen. In this contribution, the influence of carbon dioxide pressure on the location of the homogeneous liquid phase region in the phase diagram of the ternary system bmim[BF4] + 4-isobutylacetophenone + CO2 is presented. We show that for CO2 concentrations above 60 mol%, a narrow three-phase region can be found in the pressure versus temperature diagram, and that a further increase in CO2 composition gradually reduces the extension and influences the location of the one-phase liquid region, finally resulting in its complete disappearance.

Graphical abstract: High-pressure phase behavior of ternary mixtures with ionic liquids, part I: the system bmim[BF4]+4-isobutylacetophenone + CO2

Article information

Article type
Paper
Submitted
24 Jan 2008
Accepted
30 Jun 2008
First published
11 Aug 2008

Green Chem., 2008,10, 929-933

High-pressure phase behavior of ternary mixtures with ionic liquids, part I: the system bmim[BF4]+4-isobutylacetophenone + CO2

E. Kühne, G. Witkamp and C. J. Peters, Green Chem., 2008, 10, 929 DOI: 10.1039/B801362D

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