新型磁性离子液体的萃取氧化脱硫研究

Deep desulfurization of fuels by magnetic Lewis ionic liquid

通过两步法合成了新型磁性离子液体[C_(4)DBU]Cl/2FeCl_(3),并利用FT-IR、UV-Vis和VSM对其进行表征。以H_(2)O_(2)为氧化剂,考察了离子液体对模拟油中硫化物的萃取氧化脱硫效果。考察了反应温度、反应时间、离子液体质量、氧硫比和硫化物种类对脱硫率的影响。结果表明,在反应温度为60℃、反应时间为100 min、离子液体质量为1.0 g、氧硫比为5时,离子液体对二苯并噻吩的脱除率达98.38%。[C_(4)DBU]Cl/2FeCl_(3)可在外加磁场作用下实现高效回收,且重复使用6次后活性无明显下降。对不同硫化物的脱除效果为DBT>4,6-DMDBT>BT>TH。

[C_(4)DBU] Cl/2 FeCl_(3),a novel magnetic acidic ionic liquid,is synthesized via two-step method and characterized by FT-IR,UV-Vis and VSM. The extraction oxidation desulfurization performance of the ionic liquids for model oil is investigated with H_(2)O_(2) as oxidant.Effects of reaction temperature,reaction time,ionic liquids amount,molar ratio of O/S and sulfide type on desulfurization efficiency are studied in detail.Results show that the removal of DBT by the ionic liquid can reached 98. 38% under optimum conditions that reaction temperature is at 60℃,reaction performs for 100 min,ionic liquids dosage is 1. 0 g and the ratio of O/S is 5.[C_(4) DBU]Cl/2 FeCl_(3) can achieve efficient separation by applying an external magnetic field and does not show significant decline in activity after it has been recycled for 6 times.It shows the best desulfurization efficiency to DBT,coming next with 4,6-DMDBT,BT and TH.