Oxidation Desulfurization Research Of Fuel Oil In Ionic Liquid Extraction System

In order to eliminate the environmental pollution brought by automobile exhaustfrom the source, desulfurization of fuel oil has attracted more and more vision ofresearchers. Among numerous desulfurization methods, extraction desulfurization andoxidation desulfurization have a broad appliccation prospect owing to their mild reactionconditions, low operating cost and investment in equipment, excellent effect and no wastedischarge. Especially with the new green solvent ionic liquid （IL） appearing, IL extractioncoupling oxidation desulfurization technology has got more extensive researches andapplications.In this article, a new coordinated ionic liquid was prepared with cheapN-methyl-pyrrolidone （NMP） and anhydrous SnCl2as raw materials. And then theprepared IL was characterized by FT-IR and TG. The results show that coordinate bondbetween the carbonyl oxygen of NMP and Sn²⁺ion has formed, and this ionic liquid hasgood thermostability during room temperature to200℃. Through investigating the effectof the proportion of NMP and SnCl2on the desulphurization,1:1was determined as thebest proportion of the IL. With the solvent-oil ratio1:1, the extraction desulphurizationrate of DBT and diesel within10minutes could respectively reach to89.3%and85.2%. Inaddition, with H₂O₂and certain amount of CH₃COOH as oxidants, deep extractive andoxidative desulfurization of dibenzothiophene and diesel oil was investigated in theprepared ionic liquid. The desulfurization rate within30min could respectively reach to94.8%and87.6%. And the recovery of ionic liquid was implemented.High quality nano-TiO₂was easily and rapidly synthetized via a microwave-assistedprocess in ionic liquid. The effect of microwave power, reaction temperature and reactiontime on its photocatalytic activity was also researched. Without separation of the mixedsystem, the contained nano-TiO₂and ionic liquid was used as catalyst and extractant in thephotocatalytic oxidation desulphurization of dibenzothiophene and diesel. When the airflow was0.15L/min, the desulfurization rate within two hours reaction time couldrespectively reach to90.6%and86.1%under the irradiation of a500W high-pressuremercury lamp.