烷基咪唑高氯酸盐离子液体的萃取脱硫研究

以N-甲基咪唑、溴代烷烃、高氯酸钠为原料，合成烷基碳链长度不同的烷基咪唑高氯酸盐离子液体，分别考察不同条件下离子液体对模拟油品和实际油品的脱硫效果。研究结果表明，以[C6mim]ClO4离子液体为萃取剂，在萃取温度60 ℃、萃取时间50 min、离子液体与油品的体积比4:1的条件下，对硫质量分数为1 160 μg/g的模型油的一次萃取脱硫率达到86.90%；当其它条件不变，在离子液体与油品的体积比为1:1时，对硫质量分数为117 μg/g的催化裂化汽油的一次脱硫率为65.24%，对硫质量分数为1 974 μg/g的催化裂化柴油的一次脱硫率为58.05%。反应结束后，通过简单的倾倒即可将油样和离子液体分离，离子液体经减压蒸馏提纯干燥后可重复使用5次以上，其催化活性不降低。

STUDY ON EXTRACTIVE DESULFURIZATION OF ALKYLIMIDAZOLIUM PERCHLORATE IONIC LIQUID

A series of alkylimidazolium perchlorate type of ionic liquids (ILs) with different length of alkyl chains were synthesized using N-methylimidazolum, n-alkyl bromide, sodium perchlorate as raw material. The desulfurization of the model or real oil using ILs was investigated under different conditions. The results show that the best desulfurization rate is obtained after 50 min under the condition of [C6mim]ClO4:oil=4:1(v/v), 60℃, using [C6mim]ClO4 as extracting reagent. The sulfur removal reaches 86.90 % for the model oil ([S]0=1164μg/g). When the volume ratio between IL and fuel oil is 1:1, the sulfur removal is 65.24% for the FCC gasoline ([S]0=117μg/g) and 58.05% for the FCC diesel ([S]0=1974μg/g). After the reaction, the fuel oil and ionic liquid can be separated simply by decantation. The ILs used can be purified by fractional distillation and recycled at least for 5 times without significant loss of activity.