Wytze Meindersma - Ionic Liquids for Aromatics Extraction. Present Status and Future Outlook

Version 1

      Publication Details (including relevant citation   information):

      G.W. Meindersma, A.R. Hansmeiere and A.B. de Haan, Ind. Eng.   Chem. Res. 49 (16) 7530-7540, 2010,   http://dx.doi.org/10.1021/ie100703p


      Ionic liquids (ILs) can be used to replace conventional solvents   in liquid−liquid extractions of aromatic hydrocarbons. An   IL-based extraction process requires fewer process steps and less   energy consumption, provided that the mass-based aromatic   distribution coefficient and/or the aromatic/aliphatic   selectivity are higher than those of the current state-of-the-art   solvents such as sulfolane. Only a small number of ionic liquids   are able to combine higher mass-based distribution coefficients   with selectivities comparable to or higher than those of   sulfolane. The most suitable ILs from our analysis are   [bmim]C(CN)3, [3-mebupy]N(CN)2, [3-mebupy]C(CN)3, and   [3-mebupy]B(CN)4. The mass-based distribution coefficients with   these four ILs for benzene, toluene, and p-xylene are factors of   1.2−2.5 higher than those with sulfolane, and the   aromatic/aliphatic selectivities are up to a factor of 1.9 higher   than with sulfolane. Based on the performed analysis, it can be   concluded that industrial application of ILs for aromatics   extraction has not yet materialized because only four of the   total of 121 investigated ILs are considered suitable for   aromatic/aliphatic separation. Most of the reported ILs do not   provide higher mass-based aromatic distribution coefficients   and/or higher aromatic/aliphatic selectivities than those   achieved by conventional solvents such as sulfolane.

      Address (URL): http://dx.doi.org/10.1021/ie100703p