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Scurto AM, Aki SN, Brennecke JF. CO(2) as a separation switch for ionic liquid/organic mixtures. J Am Chem Soc. 2002;124(35):10276-7doi: 10.1021/ja0268682.
Scurto, A. M., Aki, S. N., & Brennecke, J. F. (2002). CO(2) as a separation switch for ionic liquid/organic mixtures. Journal of the American Chemical Society, 124(35), 10276-7. https://doi.org/10.1021/ja0268682
Scurto, Aaron M, et al. "CO(2) as a separation switch for ionic liquid/organic mixtures." Journal of the American Chemical Society vol. 124,35 (2002): 10276-7. doi: https://doi.org/10.1021/ja0268682
Scurto AM, Aki SN, Brennecke JF. CO(2) as a separation switch for ionic liquid/organic mixtures. J Am Chem Soc. 2002 Sep 04;124(35):10276-7. doi: 10.1021/ja0268682. PMID: 12197719.
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J Am Chem Soc. 2002 Sep 04;124(35):10276-7. doi: 10.1021/ja0268682.

CO(2) as a separation switch for ionic liquid/organic mixtures.

Journal of the American Chemical Society

Aaron M Scurto, Sudhir N V K Aki, Joan F Brennecke

Affiliations

  1. Department of Chemical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA.

PMID: 12197719 DOI: 10.1021/ja0268682

Abstract

A novel technique to separate ionic liquids from organic compounds is introduced which uses carbon dioxide to induce the formation of an ionic liquid-rich phase and an organic-rich liquid phase in mixtures of methanol and 3-butyl-1-methyl-imidazolium hexafluorophosphate ([C4mim][PF6]). If the temperature is above the critical temperature of CO2 then the methanol-rich phase can become completely miscible with the CO2-rich phase, and this new phase is completely ionic liquid-free. Since CO2 is nonpolar, it is not equipped to solvate ions. As the CO2 dissolves in the methanol/[C4mim][PF6] mixture, the solvent power of the CO2-expanded liquid is significantly reduced, inducing the formation of the second liquid phase that is rich in ionic liquid. This presents a new way to recover products from ionic liquid mixtures and purify organic phases that have been contaminated with ionic liquid. Moreover, these results have important implications for reactions done in CO2/ionic liquid biphasic mixtures.

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