车用燃料油氧化脱硫技术进展

Technology progress of oxidation desulfurization for vehicle fuel oil

概述了应用于车用燃料油的多种脱硫技术,主要包括加氢脱硫、催化裂化脱硫、吸附脱硫、萃取脱硫、生物脱硫等,并详细介绍了氧化脱硫技术及其脱硫机理。氧化脱硫技术主要包括:含硫化合物的氧化和分离两个步骤,从原子结构上来看,硫原子比碳原子多5个3d轨道,使得含硫化合物更容易接受氧原子而被氧化,通过氧化剂将有机硫化合物氧化成砜类, 就能增加其极性,使其更容易溶于极性溶剂, 从而达到与烃类分离的目的。与其他脱硫技术相比氧化脱硫技术的投资少,操作条件温和且不消耗氢气,对加氢脱硫难以脱除的二苯并噻吩(DBT)类化合物有较高的脱硫效率,能达到超深度脱硫的要求。

The technologies of desulfurization for vehicle fuel oil including hydrogen desulfurization, catalytic cracking desulfurization, adsorption desulfurization and oxidation desulfurization etc were reviewed. The oxidation desulfurization technique, involving oxidation and separation of sulfur-containing compounds, and its mechanism were especially presented. Due to the extra five 3 d orbits of sulfur atom, it is easier for the sulfur-containing compounds to be oxidized than hydrocarbons. Sulfone could be obtained and separated from hydrocarbons through oxidation of the sulfur-containing compounds because of the improved polarity. Compared with other technologies, the oxidation desulfurization technique is predominant in investment, operation and hydrogen consumption. It meets the need of deep desulfurization, especially for dibenzothiophenes (DBTs) which are difficult to be treated by hydrogen desulfurization method.