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Cyano-Containing Ionic Liquids for the Extraction of Aromatic Hydrocarbons from an Aromatic/Aliphatic Mixture

Cyano-Containing Ionic Liquids for the Extraction of Aromatic Hydrocarbons from an Aromatic/Aliphatic Mixture, G. Wytze Meindersma and Andre B. De Haan. Science China-Chemistry 2012, 55  (8, SI), 1488–1499.

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Abstract

Ionic liquids can replace conventional solvents in aromatic/aliphatic extractions, if they have higher aromatic distribution coefficients and higher or similar aromatic/aliphatic selectivities. Also physical properties, such as density and viscosity, must be taken into account if a solvent is applied in an industrial extraction process. Cyano-containing ionic liquids have a lower density than the benchmark solvent sulfolane and a higher viscosity. Sulfolane is from a hydrodynamic point of view a better solvent than ionic liquids for the aromatic/aliphatic extraction. The most suitable ionic liquids for the extraction of aromatic hydrocarbons from a mixture of aromatic and aliphatic hydrocarbons are [bmim]C(CN)(3), [3-mebupy]N(CN)(2), [3-mebupy]C(CN)(3), [3-mebupy]B(CN)(4) and [mebupyrr]B(CN)(4). They have factors of 1.2-2.3 higher mass-based distribution coefficients than sulfolane and a similar or higher, up to a factor of 1.9 higher, aromatic/aliphatic selectivity than sulfolane. The IL [3-mebupy]N(CN)(2) is a better extractant for the separation of toluene from a mixture of toluene/n-heptane in a pilot plant Rotating Disc Contactor (RDC) than sulfolane.

BibTeX

@article{ ISI:000307351500003,
Author = {Meindersma, G. Wytze and De Haan, Andre B.},
Title = {Cyano-Containing Ionic Liquids for the Extraction of Aromatic Hydrocarbons from an Aromatic/Aliphatic Mixture},
Journal = {Science China-Chemistry},
Year = {2012},
Volume = {55},
Number = {8, SI},
Pages = {1488-1499},
Month = {},
Abstract = {Ionic liquids can replace conventional solvents in aromatic/aliphatic extractions, if they have higher aromatic distribution coefficients and higher or similar aromatic/aliphatic selectivities. Also physical properties, such as density and viscosity, must be taken into account if a solvent is applied in an industrial extraction process. Cyano-containing ionic liquids have a lower density than the benchmark solvent sulfolane and a higher viscosity. Sulfolane is from a hydrodynamic point of view a better solvent than ionic liquids for the aromatic/aliphatic extraction. The most suitable ionic liquids for the extraction of aromatic hydrocarbons from a mixture of aromatic and aliphatic hydrocarbons are {[}bmim]C(CN)(3), {[}3-mebupy]N(CN)(2), {[}3-mebupy]C(CN)(3), {[}3-mebupy]B(CN)(4) and {[}mebupyrr]B(CN)(4). They have factors of 1.2-2.3 higher mass-based distribution coefficients than sulfolane and a similar or higher, up to a factor of 1.9 higher, aromatic/aliphatic selectivity than sulfolane. The IL {[}3-mebupy]N(CN)(2) is a better extractant for the separation of toluene from a mixture of toluene/n-heptane in a pilot plant Rotating Disc Contactor (RDC) than sulfolane.},
DOI = {10.1007/s11426-012-4630-x},
ISSN = {1674-7291},
Unique-ID = {ISI:000307351500003},
}

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