Controlling phase behaviour on gas expansion of fluid mixtures

Andrew P. Abbott; Eric G. Hope; Reena Mistry; Alison M. Stuart

doi:10.1039/B915571F

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Green Chemistry

Issue 10, 2009

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Controlling phase behaviour on gas expansion of fluid mixtures

Andrew P. Abbott , Eric G. Hope , Reena Mistry and Alison M. Stuart

Green Chem., 2009, 11, 1536-1540

DOI: 10.1039/B915571F
Received 13 May 2009, Accepted 30 Jul 2009
First published on the web 25 Aug 2009

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The application of moderate pressures (50 bar) of CO₂ to binary liquid solvent mixtures at room temperature can induce changes in phase behaviour; both inducing miscibility and splitting miscible mixtures. The cause of this phase change behaviour was found to be due to the balance between enthalpic and entropic terms that define the Gibbs energy of mixing and, hence, the partition coefficient. In the majority of binary solvent mixtures, the solvents were miscible at ambient pressure with two phases forming upon application of CO₂. For some mixtures, the phase behaviour was found to be very composition dependent and in only five systems did no phase change occur.

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Green Chemistry

Controlling phase behaviour on gas expansion of fluid mixtures

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