Six sorts of [C3—8mim]Br/FeCl3 ionic liquids were synthesized
and characterized with FT-IR and Raman spectroscopy.The extraction performance of ionic liquids during the removal of dibenzothiophene(DBT)was investigated.The extraction of DBT with [C3mim]Br/FeCl3 was the best. An increase of volume ratio of ionic liquid to oil and a higher temperature benefited the desulfurization performance.The removal ratio of DBT was up to 92% in 12 min and with volume ratio of ionic liquid to oil 1:1.Reacted ionic liquid without treatment was used again for 5 times
and the removal ratio of DBT decreased gradually to 60%.