A study of oxidative desulfurization of diesel catalyzed by acidic ionic liquid
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摘要: 以功能化酸性离子液体为催化剂，30%双氧水为氧化剂，将加氢柴油中的含硫化合物氧化为相应的砜类物质，并用N-甲基吡咯烷酮（NMP）萃取一次。同时考察了反应温度、反应时间和催化剂用量等因素对氧化脱硫反应的影响，得出最佳反应条件为,3mL油样（硫的质量分数为200×10-6）、1.5g酸性离子液体、 0.3mL H2O2、 25℃，3.5h、VNMP/Vdiesel=1∶1，脱硫率可达到86.7%，柴油硫的质量分数仅为25×10-6左右，反应结束后，可通过简单的倾倒将油样和催化剂分离，重复使用5次，其催化活性变化不大。Abstract: With acidic ionic liquid as a catalyst and hydrogen peroxide as an oxidant, the deep desulfurization of hydrotreated diesel was conducted by oxidizing thiophenic sulfur into sulfone, which was then extracted by NMP. Effects of reaction temperature, reaction time and amount of catalyst on the reaction of oxidative desulfurization were also investigated. The optimal reaction conditions are as follows: 3mL oil sample (200×10-6 sulfur content), 1.5g acidic ionic liquid, 0.3mL hydrogen peroxide, reaction temperature of 25℃, reaction time of 3.5h and VNMP/Vdiesel of 1∶1. Under these conditions, good desulfurization ratio (86.7%) and lower sulfur content in diesel (25×10-6) were obtained. After the reaction, diesel oil and catalyst can be separated by simple decantation, and the activity of catalysts would not change obviously after recycling for 5 times.
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Key words:
- task-specific acidic ionic liquid /
- oxidation /
- desulfurization /
- diesel
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