铁基离子液体湿法氧化硫化氢的反应性能

以氯化丁基甲基咪唑(BmimCl)和六水合三氯化铁(FeCl3.6H2O)为原料合成了铁基离子液体。分析表明,铁基离子液体具有非定量组成Bmim]Fe0.9Cl4.7,表现出较强的疏水特性,而且具有良好的氧化性和热稳定性。以铁基离子液体为脱硫剂,对其氧化脱除硫化氢及再生工艺进行了初步研究,考察了硫化氢流量、硫化氢浓度、反应温度和氧气流量对脱硫效率的影响。结果表明,铁基离子液体的硫容达到0.31g.L-1,氧化脱硫过程中无须添加辅助试剂和调控pH值,反应温度和硫化氢流量是对脱硫率影响最为显著的两个因素,铁基离子液体脱硫剂可以在氧气中再生并循环使用。因此,铁基离子液体作为脱硫剂可以氧化硫化氢生成硫磺并在氧气中再生并生成水。基于产物水与疏水脱硫剂的不溶性,可以构建基于疏水性铁基离子液体作为脱硫剂的非水相湿法氧化脱硫新工艺,避免了水相湿法氧化脱硫过程中二次污染及操作复杂的难题,对研究发展绿色湿法脱硫工艺具有积极意义。

Wet oxidation desulfurization of hydrogen sulfide with application of Fe-based ionic liquid

A Fe-based ionic liquid (Fe-IL) was synthesized directly by mixing 1∶2 mole ratio of 1-butyl-3-methylimidazolium(BmimCl) and FeCl_3·6H_2O at room temperature.The Fe-IL is of unstoichiometric Bmim]Fe_(0.9)Cl_(4.7),and shows high hydrophobicity,thermostability and oxidation ability.Based on the new Fe-IL a non-aqueous wet oxidation desulfurization for hydrogen sulfide was investigated and developed.It is found that its sulfur capacity is 0.31 g·L~(-1) and the desulfurization efficiency is high,which depends on flow and concentration of hydrogen sulfide,reaction temperature and oxygen flow.Compared with wet oxidation desulfurization process,the new desulfurization process is of several advantages:no secondary pollutants produce,product water separates easy and control of pH value is not necessary.The new non-aqueous desulfurization process is not only of high desulfurization efficiency on the removal of hydrogen sulfide,but also of no secondary pollution.So,it could be expected that a green wet oxidation of desulfurization can be developed based on Fe-IL oxidation desulfurater.