合成了离子液体N-甲基吡咯烷酮磷酸二氢盐（[Hnmp]H₂PO₄），并用红外光谱对其结构进行表征。以焦化柴油为原料，考察其对油品中碱性氮化物的脱除性能，结果表明，离子液体[Hnmp]H₂PO₄能够有效脱除焦化柴油中的碱性氮化物，在剂油质量比为1∶7，反应温度为30℃，反应时间为30 min的条件下，焦化柴油中碱性氮化物的脱除率为93.97%，此时精制油中碱氮质量分数为35 μg/g。该离子液体在回收利用4次后，脱氮率仍可达到83%以上。

Acidic ionic liquid N-methyl pyrrolidone dihydrogen phosphate ([Hnmp]H₂PO₄) is synthesized and its structure is characterized with FT-IR spectroscopy.Its performance of removing alkaline nitrogen containing compounds in oil products is investigated by using coking diesel oil as feedstock.Experiment results show that[Hnmp]H₂PO₄ can efficiently remove the alkaline nitrogen containing compounds from coking diesel oil.The efficiency of removing alkaline nitrogen containing compounds achieves 93.97% at 30℃,w(ionic liquid):w(oil)=1:7 and reaction time of 30 min.The content of alkaline nitrogen containing compounds left in refined oil is 35 μg·g^-1.In addition,the removal efficiency by the ionic liquid can still reach 83% after four recycles.