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Extractive–oxidative desulfurization of model fuels using imidazole-based dicationic ionic liquids as extractants
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2021-12-03 , DOI: 10.1039/d1re00372k Ruwei Chen 1 , Xinyi Yu 1 , Xuran Ye 1 , Jingwen Li 1 , Bing Hu 1
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2021-12-03 , DOI: 10.1039/d1re00372k Ruwei Chen 1 , Xinyi Yu 1 , Xuran Ye 1 , Jingwen Li 1 , Bing Hu 1
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A series of bis-imidazole ionic liquid extractants [Cn(MIM)2]X2 (n = 2, 4, 6; X = HSO4−, p-CH3C6H4SO3−, CF3COO−) with different acidities were designed, synthesized and applied to the extractive–oxidative desulfurization system with H2O2 as an oxidant. The extractants were characterized by UV-vis spectroscopy and other methods. The effects of different factors on the desulfurization efficiency were investigated. The results showed that the desulfurization efficiency was highest when bis-(1-butyl-3-methylimidazole p-toluenesulfonate) [C4(MIM)2](p-TSA)2 was used as an extractant. Under the optimal reaction conditions, the removal rate of dibenzothiophene (DBT) reached 98.35%, and its good extraction performance depended on the length of the carbon chain in the cation and the acidity of the anion. Increasing the length of the carbon chain in the cation and choosing the anion with strong acidity could improve the extraction efficiency of sulfide. The removal order of different sulfides by [C4(MIM)2](p-TSA)2 was DBT > 4,6-dimethyldibenzothiophene (4,6-DMDBT) > benzothiophene (BT), and the extraction performance of [C4(MIM)2](p-TSA)2 which had been used 6 times was recovered after back-extraction. Under the same reaction conditions, the removal rate of DBT could still reach 92.51%. After the discussion on the reactive oxygen species and desulfurization mechanism, it was found that ˙OH and ˙O2− played a major role in the oxidation of sulfide. At the same time, the interaction between the extractant and sulfide was the key factor for the extractant to show great extraction performance.
中文翻译：
以咪唑基双阳离子离子液体为萃取剂的模型燃料萃取氧化脱硫
一系列双咪唑离子液体萃取剂[C n (MIM) 2 ]X 2 ( n = 2, 4, 6; X = HSO 4 - , p -CH 3 C 6 H 4 SO 3 - , CF 3 COO - )设计、合成了不同酸度的H 2 O 2萃取-氧化脱硫系统作为氧化剂。萃取剂通过紫外-可见光谱和其他方法进行表征。考察了不同因素对脱硫效率的影响。结果表明，双-(1-丁基-3-甲基咪唑对甲苯磺酸盐) [C 4 (MIM) 2 ]( p -TSA) 2脱硫效率最高。用作萃取剂。在最佳反应条件下，二苯并噻吩（DBT）的去除率达到98.35%，其良好的萃取性能取决于阳离子中碳链的长度和阴离子的酸度。增加阳离子中碳链的长度，选择酸性强的阴离子，可以提高硫化物的萃取效率。[C 4 (MIM) 2 ]( p -TSA) 2对不同硫化物的去除顺序为 DBT > 4,6-二甲基二苯并噻吩 (4,6-DMDBT) > 苯并噻吩 (BT), [C 4 (MIM) 2 ]( p -TSA) 2使用6次后反萃取回收。在相同反应条件下，DBT的去除率仍能达到92.51%。经过对活性氧和脱硫机理的讨论，发现˙OH和˙O 2 -在硫化物的氧化中起主要作用。同时，萃取剂与硫化物的相互作用是萃取剂表现出良好萃取性能的关键因素。
更新日期：2022-01-07
中文翻译：
以咪唑基双阳离子离子液体为萃取剂的模型燃料萃取氧化脱硫
一系列双咪唑离子液体萃取剂[C n (MIM) 2 ]X 2 ( n = 2, 4, 6; X = HSO 4 - , p -CH 3 C 6 H 4 SO 3 - , CF 3 COO - )设计、合成了不同酸度的H 2 O 2萃取-氧化脱硫系统作为氧化剂。萃取剂通过紫外-可见光谱和其他方法进行表征。考察了不同因素对脱硫效率的影响。结果表明，双-(1-丁基-3-甲基咪唑对甲苯磺酸盐) [C 4 (MIM) 2 ]( p -TSA) 2脱硫效率最高。用作萃取剂。在最佳反应条件下，二苯并噻吩（DBT）的去除率达到98.35%，其良好的萃取性能取决于阳离子中碳链的长度和阴离子的酸度。增加阳离子中碳链的长度，选择酸性强的阴离子，可以提高硫化物的萃取效率。[C 4 (MIM) 2 ]( p -TSA) 2对不同硫化物的去除顺序为 DBT > 4,6-二甲基二苯并噻吩 (4,6-DMDBT) > 苯并噻吩 (BT), [C 4 (MIM) 2 ]( p -TSA) 2使用6次后反萃取回收。在相同反应条件下，DBT的去除率仍能达到92.51%。经过对活性氧和脱硫机理的讨论，发现˙OH和˙O 2 -在硫化物的氧化中起主要作用。同时，萃取剂与硫化物的相互作用是萃取剂表现出良好萃取性能的关键因素。
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