EMIES/p-TsOH型低共熔溶剂的合成及其氧化脱硫性能的研究

通过1-乙基-3-甲基咪唑硫酸乙酯离子液体（EMIES）和对甲苯磺酸（p-TsOH）的混合物制备EMIES/p-TsOH型低共熔溶剂。其结构特征通过红外光谱、氢谱和热重技术进行了分析。并以EMIES/p-TsOH作为催化剂与萃取剂，H₂O₂作为氧化剂研究了其对模拟油中的硫化物的脱除性能。考察了反应温度、n（H₂O₂）/n（S）比、低共熔溶剂加入量及硫化物类型对脱硫效果的影响。在最佳的条件下，模拟油中二苯并噻吩（DBT）、4，6-二甲基二苯并噻吩（4，6-DMDBT）和苯并噻吩（BT）的脱除率分别为96.2%、92.2%和88.8%。经过五次循环使用后，DBT的脱除率仍达到93.6%。对该脱硫体系进行了动力学分析，其表观活化能为66.4kJ/mol。

Synthesis of EMIES/p-TsOH type deep eutectic solvent and its oxidative desulfurization performance

The deep eutectic solvent (DESs) of EMIES/p-TsOH was synthesized by stirring a mixture of 1-ethyl-3-methylimidazolium ethyl sulfate (EMIES) and p-toluene sulfonic acid (p-TsOH), the structure of catalysts was characterized by infrared analysis (FT-IR), hydrogen spectrum analysis (¹H-NMR) and thermogravimetric analysis(TG), the desulfurization performance of model oil was investigated using EMIES/p-TsOH as a catalyst and extraction agent and using H₂O₂ as the oxidation, and the effects of the temperature, n(H₂O₂)/n(S) molar ratio, and the amount of DESs on the desulfurization activity were investigated in detail. Under the optimal conditions, the removal rate of dibenzothiophene (DBT), 4,6-dimethyldibenzothiophene (4,6-DMDBT) and benzothiophene (BT) can reach up to 96.2%, 92.2% and 88.8%, respectively. After five recycling runs, the removal rate of DBT can still reach 93.6%. The kinetic analysis of the desulfurization system indicates that the apparent activation energy is 66.4 kJ/mol.