FeCl3低温共熔Cl深度萃取模拟油脱硫性能的研究

用 N-甲基咪唑和氯代正辛烷为原料,首先合成出中间体Omim]Cl,然后与几种典型的金属氯化物按不同的物质的量比合成出了一系列的离子液体,采用红外光谱对其进行表征,并考察了离子液体对正辛烷中二苯并噻吩的萃取脱除效果。对几种不同的离子液体的脱硫性能进行了初步比较,并针对Omim]Cl·2FeCl3离子液体详尽考察了剂油体积比、萃取时间、萃取温度、硫化物的种类、重复利用次数等因素对脱硫率的影响。结果表明,萃取温度为25℃,萃取时间为20 min,剂油体积比为1∶20时,Omim]Cl·2FeCl3对 DBT 的脱除率高达99.20%,并且对4种不同含硫组分的脱除能力：DBT>BT>T>3-MT。且离子液体再重复使用5次后,对 DBT 的脱除率还能够达到89.56%,离子液体经回收之后,对 DBT 的脱除率没有明显的下降,表明再生效果良好。实验数据对咪唑离子液体的萃取脱硫性能研究和反应条件的优选提供了重要信息。

Deep Extractive Desulfurization from Model Oil by Ionic Liquid Synthesized with FeCl3 at Low Temperature

We first synthesized intermediates Omim]Cl using N-methyl imidazole and chlorinated octane as raw material,then a series of ionic liquids were prepared by some typical metal chlorides according to different mole ratio.The ionic liquids were characterized using infrared spectroscopy and the extraction performance of ionic liquids during the removal of dibenzothiophene from n-octane was investigated.Desulfurization performance of several diffe-rent ionic liquids were compared,and the effect of oil volume ratio,extraction time,extraction temperature,kinds of sulfide,and reuse times were investigated.Results showed that the removal of dibenzothiophene is as high as 99.20%for volume ratio of 1∶20 in 20 min at 25 ℃ under the mild reaction conditions,and the removal ability of four different compounds containing sulfur is:DBT>BT>T>3-MT.It was also found that the removal of DBT could also reach to 89.56%that the reacted ionic liquid without treatment was used again for 5 times,showed that the regeneration effect is good.Results of this work might offer significant insights in the perceptive use of imidazolium ILs as energy-effi-cient green material for desulfurization of model oil and is helpful for the selection of better reaction conditions.