低共熔离子液体脱除柴油中氮化物

Removal of nitrogen compounds from diesel oil with eutectic ionic liquid

合成低共熔离子液体氯化胆碱/草酸,采用红外光谱和核磁共振氢谱对其结构进行表征并以模型柴油和焦化柴油为原料考察其脱氮性能。结果表明,在萃取时间30 min,萃取温度30℃,剂油质量比1∶7和沉降时间2 h的条件下,喹啉脱除率近100%,吲哚脱除率为88.05%。进一步研究发现,该离子液体对焦化柴油中的氮化物也表现出较好脱除性能,在实验条件下,碱氮和总氮脱除率分别为96.61%、71.5%,且该低共熔离子液体经回收重复使用四次后,对焦化柴油的碱氮脱除率仍可达到87.2%。

An eutectic ionic liquid(EIL),choline chloride/oxalic acid,was synthesized and its structure was characterized with FT-IR spectroscopy and ~1H-NMR. The denitrogenation performance of the EIL was investigated in detail using model oil and coker diesel oil as feedstock. Experimental results show that the removal efficiencies of quinoline and indole are almost 100% and 88.05%,respectively at 30 ℃ with the EIL to oil ratio of 1 ∶7(mass ratio),extraction time of 30 min and settling time of 2 h. It is also found that the choline chloride/oxalic acid presents a better denitrogenation performance for coker diesel oil,and the basic and total N-extraction efficiency can reach 96.61% and 71.5%,respectively. In addition,the basic N-removal efficiency can still reach 87.2% after four recycles of the EIL.