Study On Synthesis Of Nickel Compound And Demetalization Additives Of Heavy Oil

The metal existing in crude oil does great harm to oil processing and use. Among them Niand V have the highest content and most serious effect. They are toxicant of Catalytic Crackingcatalyst. Also they can make the Hydrocracking catalyst deactivation and easy to block theHydrocracking bed. So the study on removing Ni and V from the crude oil has importantpractical significance.In this paper the demetallization agents were used to remove Ni and V in the oil. Ni andV mainly exist as metal porphyrin complex. Because of the oil components is complex,model compounds were used as the study objects to discuss the mechanism of demetalization.5,10,15,20-tetraphenyl-21H,23H-porphine nickel is synthetized in this paper. It has similarstructure with petroporphyrins. The effects of porphyrin synthesis with Alder acid methodand Cancheng Guo method were compared. It is found that Alder acid method is better thanCancheng Guo method at the aspect of efficiency of the reaction, yield and economiceffectiveness. Elemental analysis, ultraviolet-visible spectroscopy, infrared spectroscopy andatomic absorption spectrum were used to test and verify the structure and composition of5,10,15,20-tetraphenyl-21H,23H-porphine nickel. It turned out that the synthesis result wasclosed to theories.The synthetic5,10,15,20-tetraphenyl-21H,23H-porphine nickel was dissolved in lubebase oil to make a model compound. The content of nickel in the compound is about30μg/g.17species of single component and6species of composite demetallization agents were testedthe effect of Ni deprivation under different conditions. Take the deprivation of Ni, economiceffectiveness and environmental protection into consideration,2species of single componentand4species of composite demetallization agents were choosed among them. The mostsuitable working conditions (the dose, the reaction temperature and the reaction time) of thesedemetallization agents were studied. The results indicated that enlarging the dose, raising the reaction temperature and extensing the reaction time can all make the effect of Ni deprivationbetter. But as the reaction of Ni deprivation is dynamic balanced, when certain conditions arereached, the deprivation of Ni will stop increasing.The selected demetallization agents were used to remove Ni and V in Shandong LijinPetrochemical Company crude oil, Shandong Lijin Petrochemical Company residual oil,Gudao crude oil and Gudao residual oil under certain conditions. The results indicated thatthe deprivation of Ni in oil is much lower than that in model compounds and the deprivationof V is higher than Ni. The effect of removing Ni and V in the Shandong Lijin PetrochemicalCompany crude oil with4species of composite demetallization agents under auxiliaryultrasonic radiation and crude oil electric dehydration apparatus were tested. It showed thatboth the deprivations of Ni and V were enhanced. Petroleum ether, Toluene and hydrogenateddiesel were used as the diluent of Gudao residual oil. The mass ratio of diluent and Gudaoresidual oil is1:1. It turned out that the effects of demetallization agents on removing Ni andV in the blend oils were improved significantly, and hydrogenated diesel as the diluentworked best.