吡咯烷酮类离子液体萃取脱除模拟汽油中的噻吩

Removal of thiophene from simulated gasoline by extraction with pyrrolidone-based ionic liquids

合成了3种N-甲基吡咯烷酮离子液体([HNMP]FeCl4,[HNMP]CuCl2,[HNMP]ZnCl3),并将其用于模拟汽油(噻吩溶于正辛烷,硫含量1381μg/g)中噻吩的萃取脱除。考察了[HNMP]FeCl4的深度脱硫和重复使用性能。实验结果表明:30℃下3种离子液体脱硫能力的强弱顺序为[HNMP]FeCl4>[HNMP]CuCl2>[HNMP]ZnCl3;在[HNMP]FeCl4与模拟汽油的体积比为1∶1、FeCl3与[HNMP]Cl的摩尔比为1、萃取时间为60min的优化条件下,单程脱硫率为70.7%,经4级萃取后模拟汽油中的硫含量降至61μg/g、总脱硫率为95.6%;利用真空加热法对[HNMP]FeCl4进行再生,[HNMP]FeCl4使用5次后脱硫率从70.7%降至59.5%,仍保持较好的脱硫性能。

Three N-methyl pyrrolidone-based ionic liquids,[HNMP]FeCl4,[HNMP]CuCl2 and [HNMP]ZnCl3 were synthesized and used as extractants to remove thiophene from the simulated gasoline with 1 381 μg/g of sulfur content prepared by dissolving thiophene in n-octane. The deep desulfurization effect and reuse performance of [HNMP]FeCl4 were investigated. The experimental results show that：The order of desulfurization capability of ionic liquids at 30 ℃ is [HNMP]FeCl4〉 [HNMP]CuCl2〉 [HNMP]ZnCl3;Under the optimum conditions of volume ratio of [HNMP]FeCl4 to simulated gasoline 1∶1,mole ratio of FeCl3 to [HNMP]Cl 1 and extraction time 60 min,the desulfurization rate in a single pass is 70.7%,the sulfur content of the simulated gasoline is decreased to 61 μg/g and the total desulfurization rate is 95.6% after 4-stage extraction;[HNMP]FeCl4 is regenerated by vacuum heating method,and after 5 times of reuse,its desulfurization capability is still remained with desulfurization rate decreased from 70.7% to 59.5%.