绿色试剂[Bmim]BF_4的合成、表征及脱硫性能研究

选取了一种绿色离子液体Bmim]BF_4来研究其合成及深度萃取脱硫过程,采用单因素分析法确定了其最佳合成工艺,结构通过UV、FT-IR、~1HNMR、~(13)CNMR和GC-MS等表征得到了验证,同时考察了萃取温度、萃取时间和剂油体积比等因素对模拟油体系脱硫率的影响.实验结果表明,在最优脱硫条件下,BT和DBT的单级萃取最大脱硫率为40.14%和54.39%.进一步考察了多级萃取和氧化脱硫效果,经过三级连续萃取后,DBT和BT的脱除率都能达到80%,ILs-FeCl_2-H_2O_2耦合体系对DBT的脱除率能够达到100%,对BT的脱除率也能够达到84%.最后研究了Bmim]BF_4的再生和重复利用过程,用去离子水反萃取对离子液体进行回收,也考察了回收后离子液体的脱硫性能,结果表明再生效果良好.研究结果对脱硫工艺的改进具有很好的应用前景.

Synthesis Characterization and Application in Extractive Desulfurization for Model Fuel of Green Reagent[Bmim]BF_4

In this paper a green ionic liquidBmim]BF_4was chosen to be researched to study the process of deep extractive desulfurization of model fuel and selected the best synthesis technology using single factor analysis method.Data of UVFTIR,1 HNMR,~(13)CNMR and GC-MS have been discussed for the molecular confirmation of synthesized Bmim]BF_4,Effects of reaction time,reaction temperature,volume ratio of ionic liquid to model oil on BT and DBT removal of liquid fuel were presented.Results showed:under the optimal desulfurization conditions,the maximum removal rate of single stage extraction on BT and DBT was 40.14% and 54.39%.To further investigate the multi-stage extraction and oxidation desulfurization effect,after 3-level extraction,removal rate of DBT and BT can both reach 80%,and the removal effect of ILs-FeCl_2-H_2O_2 composite system on DBT removal rate could even reach 100%,the BT removal rate also could reach 84%.Finally the regeneration and the reuse of ionic liquid were also investigated,using reverse extraction recovery of ionic liquids,and studied desulfurization performance of recovered ionic liquids,showing feasible regeneration effect.The result might be a good application prospect for the improvement of desulphurization process.