Use of ionic liquids as phase-transfer catalysis for deep oxygenative desulfurization

Using the immiscibility properties of room-temperature ionic liquids (RTILs) in common organic or aqueous phases, an extractive desulfurization process was developed. The key features of RTILs are nonvolatility, nonflammability, higher thermal stability, and ease of recyclability as green solvents. Recently, an oxidant was added to RTIL to achieve better efficiency. Meanwhile, the modified ultrasound-assisted oxidative desulfurization (UAOD) was adjusted. The mechanism used in the newly modified UAOD process is still multiple phase-transfer catalysis and this newly modified process was also used for desulfurization of Navy diesel (E-76) with a sulfur concentration.