Use of Ionic Liquids as Phase-Transfer Catalysis for Deep Oxygenative Desulfurization

摘要

Recently, an extractive desulfurization process was developed using the immiscibility properties of room-temperature ionic liquids (RTILs) in common organic or aqueous phases. Advantages of RTILs are nonvolatility, nonflamma-blity, higher thermal stability, and ease of recyclability as green solvents. Also, this method can remove nitrogen components, although the Nerst partition coefficient favor to extract most aromatic components of the oil is the limitation of this method. Only very recently was an oxidant added to RTIL to achieve better efficiency, yet the concept is that the massive amount of solvent used is expensive to recycle.