Abstract
Environmentally friendly and effective removal of Br − and Cl − impurities in hydrophilic dialkylimdazolium or butylpyridinium ionic liquids was investigated and developed at room temperature to 80 °C and atomspheric pressure. Constant elelctrolysis was applied to oxidize Br − and Cl − to their corresponding Br 2 and Cl 2, then the BF 4 - and NO 3 - ions from HBF 4 and HNO 3 solution in the cathode zone move to anode zone through an anion exchange membrane and combine with dialkylimdazolium or butylpyridinium cation to form ionic liquids. The Br 2 and Cl 2 in electrolyzed ionic liquids are treated with ethylene to afford the corresponding 1,2-dibromo (or dichloro) ethane which could easily be removed by volatilisation under vacuum ( ca. 10 mm Hg). Removal of Br − and Cl −impurities (0.94–4.47 wt%) from hydrophilic dialkyl imdazolium or butylpyridinium ionic liquids through electrolysis and ethylene treatment could be achieved at 0.06%–0.29% without any additional solvents and ionic liquid loss.
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