Research advances of extraction separation of phenolic compounds by ionic liquids
Ionic liquids contain imidazolium-based,choline-based,amine-based,quaternary phosphonium-based,pyridinium-based,and pyrrolidinium-based ionic liquids,etc.Ionic liquids are described as green solvents due to their characteristics such as low volatility,nonflammability,thermal stability,and high solubility.Therefore,ionic liquids could be used as efficient extractants or extraction additives for extraction of phenolic compounds in liquid phase.The extraction mechanism and performance of phenolic compounds with different kinds of ionic liquids are reviewed systematically.Then,the latest research progress on extraction and separation of phenolic compounds in liquid phase by ionic liquids are comprehensively summarized.Besides,the influencing factors on extraction of phenolic compounds in liquid phase by ionic liquids are deeply analyzed.Furthermore,the existing problems and development prospect are discussed.In the future,the progress of extraction of phenolic compounds in liquid phase by ionic liquids are mainly in the following three aspects.The used ionic liquids would better have low viscosity,low water solubility,low cost,low toxicity,high stability,high extraction efficiency,high selectivity and high biodegradability.The ionic liquids and the raffinate are facile phase separation and liquids are easily reclaimed from the rich extract phase.The recycled ionic liquids could be reused multiple times and maintain good performance.The ionic liquid extractants and extractors would be highly integrated in order to build a complete extraction system and realize high extraction efficiency.
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