酸性离子液体脱除柴油中碱性氮化物

Removal of basic nitrogen compounds from diesel oil with acidic ionic liquid

合成离子液体N-甲基吡咯烷酮磷酸二氢盐([Hnmp]H_2PO_4),用吡啶红外探针法测定其酸性。采用500μg/g的喹啉模型油考察其对油品中碱性氮化物的脱除性能。结果表明,在剂油质量比1∶7,反应温度为30℃,反应时间为30 min,静置时间120 min的条件下,模型油中碱性氮化物的脱除率可达到98.64%。在离子液体[Hnmp]H_2PO_4回收利用4次后,碱氮脱除率仍在96%以上。同时该离子液体也能有效脱除碱氮含量高达0.52%(质量分数)的抚顺页岩油柴油馏分中的氮化物,当剂油质量比为1∶1时,柴油馏分的碱氮脱除率可达94.25%。

Acidic ionic liquid( IL) N-methyl pyrrolidone dihydrogen phosphate( [Hnmp]H_2PO_4) was synthesized and its acidity was determined by using pyridine as IR spectroscopic probes. The denitrogenation performance of the acidic ionic liquid was investigated by using the model oil containing quinoline. Results showed that the acidic ionic liquid exhibited good denitrogenation performance achieving 98. 64% basic Nextraction efficiency under the operation conditions with temperature of 30 ℃,1∶ 7( w/w) IL∶ oil,reaction time of 30 min and settling time of 120 min. In addition,the basic N-removal efficiency can still reach 96% during four recycles of the ionic liquid. Furthermore,the acidic ionic liquid also can effectively remove the basic nitrogen compounds from Fushun shale diesel fraction that included 0. 52% basic nitrogen,and basic N-extraction efficiency can reach 94. 25% when mass ratio of IL to oil was 1∶ 1.