基于磁性离子液体的柴油深度催化氧化-萃取脱硫研究

Production of ultra-low-sulfur diesel fuel has become a major task of refineries all over the wold. The presence of sulfur compounds in diesel fuel has shown an adverse impact on the environment. It is because sulfur compounds are convered to SOx during the combustion of car engines. According to the characteristics of sulfur compounds in diesel fuel, the project is to design magnetic ionic liquids (MILs) with extractive and catalytic properties, as well as being used as reaction media. In order to obtain the deep extractive and catalytic oxidative desulfurization mechanism, the structure-property relationship of these MILs with respect to the desulfurization performance will be investigated, and the interactions between sulfur compounds with the MILs or oxidants will also be studied from the micro scale and molecular level by the combination of spectroscopy with molecular dynamics simulation. To reduce the loss of MILs during the separation process, magnetic field will be used to speed up the MILs and oil phase separation. These results will provide theoretical guidance to develop a new deep desulfurization technology.

机动车尾气中SOx已成为大气的主要污染源之一，主要原因是柴油中硫含量较高，为此对柴油进行深度脱硫，是目前国内外研究的热点之一。本项目拟针对柴油中硫化物特点，设计具有萃取和催化性能的磁性离子液体，将其萃取、催化和反应介质三种功能集合于一体；利用谱学表征与模拟计算相结合，考察离子液体结构和脱硫性能之间的定量关系，并从微观和分子层次上研究磁性离子液体与含硫化合物及氧化剂之间的相互作用关系，获得磁性离子液体深度催化氧化-萃取脱硫的机理；采用外加磁场强化，加快磁性离子液体与油相分离，减少离子液体的损失，获得磁场强度对两相分离的定量关系，为开发柴油深度脱硫新工艺提供理论指导。

利用离子液体对柴油进行深度脱硫，是目前国内外研究的热点之一。本项目设计具有萃取和催化性能的磁性离子液体，将其萃取、催化和反应介质三种功能集合于一体；考察离子液体结构和脱硫性能之间的定量关系，并研究磁性离子液体与含硫化合物及氧化剂之间的相互作用关系，获得磁性离子液体萃取氧化耦合脱硫的机理；为开发柴油深度脱硫新工艺提供理论指导。