EMIES/p-TsOH型低共熔溶剂的合成及其氧化脱硫性能的研究

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

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66.4 k J/mol。

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.