溶剂效应对络合反应法脱除模拟柴油中氮化物的影响

EFFECT OF SOLVENT ON COMPLEXATION REMOVAL OF NITROGEN COMPOUNDS FROM SIMULATED DIESEL FUEL

考察溶剂对络合反应法脱除石油中氮化物效果的影响。选择一系列具有代表性的金属盐络合剂与模型化合物进行络合反应,结合气相色谱-质谱(GC-MS)分析结果,研究不同金属盐在不同反应溶剂中对氮化物的络合脱除效果。结果表明:溶剂效应会显著影响部分盐络合反应脱除氮化物的效果,乙醇有利于金属盐的溶解和金属离子的解离,因此Fe2(SO4)3,ZnSO4,CuSO4,NiSO4,PdCl2在乙醇体系中能较好地络合脱除碱性氮化物;甲苯和乙醇能促进CuCl2金属离子解离,使得CuCl 2在甲苯和乙醇中比在二氯甲烷中络合脱除碱性氮化物的效果好;溶剂效应对ZnCl2络合脱除碱性氮化物效果的影响不显著;FeCl3在乙醇体系中络合脱除碱性氮化物时伴随有显著的副反应,副产物有氯代芳烃和聚合物。

The effect of solvent on the removal of nitrogen-compounds from petroleum fractions by complexation reaction was investigated.A series of representative metal salt complexing agents and model compounds were selected for complexing reaction.The effects of metal salts on removal of nitrogen compounds by complexing in different solvents were studied by gas chromatography-mass spectrometry(GC-MS).The results showed that the solvent effect was significant on the removal of basic nitrogen compounds by metal complexation for some of the metal salts.The ethanol could promote the dissolution of the salts and dissociation of ions,helpful to remove out the basic nitrogen compounds by Fe2(SO4)3,ZnSO4,CuSO4,NiSO 4 and PdCl2.Toluene and ethanol improved the removal efficiency of basic nitrogen compounds for CuCl2.However,the solvent effect on the removal of basic nitrogen compounds by ZnCl2 was inconspicuous.The side reaction was occurred during the process of denitrogenation by FeCl3 in ethanol,forming by-products including chlorinated aromatics and polymers.