| 摘要 |
<p>A method is disclosed to replace halide anions (chloride, bromide, iodide) in ionic liquids by other anions, leading to water-soluble ionic liquids. The halide ionic liquids are first transformed into phenolate ionic liquids by reaction between the halide ionic liquid and a sodium phenolate salt. A solution of the phenolate ionic liquid in a water-immiscible organic solvent is treated with an aqueous solution of a Bronsted acid. This leads to the formation of an ionic liquid with the anion of the Bronsted acid and a phenol. The phenol remains dissolved in the organic phase and can be recycled. The newly formed ionic liquid dissolved in the aqueous phase and can be recovered in a pure state by removal of water. Preferred cations include quaternary ammonium compounds, phosphonium compounds, sulfonium compounds, dialkylimidazolium compounds, 1-alkylpyridinium compounds, 1,1-dialkylpyrrolidinium compounds, 1,1-dialkylpiperidinium compounds and/or 1,1-dialkylmorpholinium compounds.</p> |
