N -Methylpyrrolidone (NMP)used as solvent for lube oil refining has strong dissolving ability , perfect selectivity , and good environmental protection function.But the rate of denitride is low , and the corrosion of the equipments is also a problem .The No .1 refinery' s vacuum gas oil w as use as feedstocks in the experiment , and it was refined by NM P solvent and additive to increase the rate of denitride .The maximum denitrification rate reaches to 84 .54%.A series of extractant , with different mass fraction of the denitrifier and different volumicration of solvent and oil, were titrated by the standard titration of potassium hydroxide and ethanol,and their aciditys were computed by the consumption of the standard titration.According to the acidity' s curve , the effect of mass fraction of the denitrifier and volumic ratio of solvent and oil on acidity is investigated, the acidity increases with the increasing of the mass fraction of the denitrifier , and decreases with the increasing of the volumic ratio of solvent and oil .The denitrifier has no effect on oxidization of NMP solvent

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