The Study Of Complex Denitrification In Lubricant By Jioning Furfural And Additives

At present,the lubricant base oil can be taken from various types of crude oil,it has different vulnerabilities in quality,including a common problem:poor oxidation stability.Oxidation stability is one of the important natures in quality indexes of the lubricant base oil,it directly impacts the lifetime of oil and high temperature performances.Numerous studies show that:sulfur compounds in lubricant base oil have inhibiting effect on oxidation,that is positive interaction;while nitrogen compounds,polycyclic aromatic hydrocarbons,especially basic nitrogen compounds can accelerate oxidation,that is negative effect.Selective removal nitrogen compounds in oil can not only effectively improve the oxidation stability of oil,but also can significantly improve the degree of resistance to emulsification. So how to remove the nitride, especially basic nitrogen compounds,can improve the quality of lube base oil,that is improve the oxidation stability,which is extremely important.In this study,complex reaction is used to remove the basic nitrogen quinoline in model compounds.The base lubricant oil from No.2 VGO replaces lubricant,quinoline replaces basic nitrogen,quinoline is added in base oil to prepare nitrogen-containing lubricating model compounds.In this experiment,different transition metal compounds are dissolved in the furfural to form denitrification solution,in a given temperature,according to some oil/solvent ratio,the mixture of denitrification solution and lubrication model compounds are added in the constant temperature oil bath,fully mixing,transition metal compounds with basic nitrogen compounds(quinoline) in oil has complexion reaction.The forming complexes can easily dissolve in the furfural,and then after sedimentation and separation,measure the content of the basic nitrogen in raffinate phase,and calculate the content of basic nitrogen in extraction phase based on the total mass balance and basic nitrogen mass balance,calculate the distribution coefficient,selectivity coefficient and removal rate of basic nitrogen,compare the extraction effect after adding metal additives,the superior additives are chosen.The conclusions are:(1)According to single factor experiments, influences on the selectivity factor and removal rate of the basic nitrogen by temperature and oil/solvent ratio are obtained,finding a more suitable metal additive dosage of 0.5:1~1.333:1,the results can be seen that adding small amount of additive can greatly enhance the effect of furfural refining,its basic nitrogen removal rate significantly increases.(2)Through orthogonal test determining the effects on the complex extraction (removal rate of basic nitrogen),the most influential factor is the metal additive dosage,followed by the oil/solvent ratio,temperature minimum.On the basis of orthogonal test data regression fit is underway,fitting formula of partition coefficient,selectivity coefficient and the basic nitrogen removal rate is obtained. By making optimization on the formula of the selectivity coefficient, optimal operating conditions of extraction reaction and the maximum value of selectivity coefficient are obtained by adding various additives.It can be seen that values of selectivity coefficient by adding ZnBr2 and CrBr3 is superior to FeCl3 and SbCl3.According to the fitting formula of basic nitrogen removal rate,at the same temperature and the same oil/solvent ratio,adding the four additives,the removal rate of basic nitrogen changes with the increasing of metal additives.It can be drawn that after adding metal additives nitrogen removal can significantly improve,but the removal rate of basic nitrogen under the four additives has little difference.According to the comparation of optimization of selectivity coefficient and the removal rate of basic nitrogen,in this study the optimum metal additives selected are zinc bromide and chromium bromide.This study has a great theoretical significance on removing quinoline in model compounds by furfural refining added auxiliaries, through the regression fitting of selectivity coefficient and basic nitrogen removal rate,auxiliary can effectively be chosen. By making optimization on the formula of the selectivity coefficient,optimal operating conditions are obtained,it can guide the actual production process of the furfural plus auxiliaries refining to remove quinoline.