离子液体合成及多级逆流萃取脱硫的串级实验法验证研究

通过两步合成法合成了1-庚基-3-甲基咪唑四氟硼酸盐离子液体（C7MIM]BF4），以30%的过氧化氢作氧化剂，考察了其在不同剂油比、萃取时间、萃取温度、萃取速率下对汽油的脱硫效果，确定了最佳脱硫条件，计算出离子液体多级逆流萃取脱硫的理论级数，并在此条件下平行做三组串级实验，进行多级逆流萃取脱硫的模拟验证。结果表明，在V(C7MIM]BF4):V(H2O2):V(Oil)=1:1:10、反应温度60 ℃、震荡速率600 r/min的条件下反应60 min后，一次脱硫率达到77 %，采用四级逆流萃取脱硫后，汽油的硫质量分数由155 μg/g降至10 μg/g以下，脱硫率达到94 %，汽油回收率达到95 %，具有较好的工业应用前景。

SYNTHESIS OF IONIC LIQUID AND VERIFICATION OF MULTI-STAGE COUNTER CURRENT EXTRACTION DESULFURIZATION BY STRING CLASS EXPERIMENT METHOD

In this article, the immobilized 1-heptyl-3-methylimidazolium borofluoride ionic liquid was synthesized by two-steps synthesis. The ionic liquid was applied as extracting reagent for oil desulfurization using hydrogen peroxide (30%) as the oxidant. The desulfurization conditions were checked and optimized by changing the ratio of ILs/oil, extraction time, temperature, and rate. Theoretical stages of the multi-stage countercurrent extraction desulfurization of the ionic liquid were also calculated and verified by three sets of parallel string class simulation experiment under the optimized conditions. The results show that the best desulfurization rate of 77% for FCC gasoline was obtained after 60 minutes at V(IL):V(H2O2):V(Oil)=1:1:10, 60℃ and revolution speed of 600 r/min. After the 4 stages counter current extraction, the sulfur content of the feed gasoline decreases to 10 μg/g with the sulfur removal efficiency of 94% and the gasoline recovery of 95%, which shows good perspective for industrial applications.