Study On Methodology Of Cleanly Removing Naphthenic Acid From Distillate Oil

There is abundant naphthenic crude oil in China National Offshore Oil Corp. (CNOOC), which can be utilized as the optimal stock to produce the lube base oil. Because the distillate oil has high acid number, it brings many negative effects to the production and the performance of the lube oil. Meanwhile, the naphthenic acid is a very important and valuable raw material that can be used in many areas of the industry processes and the daily life. At present, the way to decrease the acid number is alkali washing-electronic field refining, but there some disadvantages such as the emulsification formation of the oil and water, the generation of the sediment of alkali and serious pollution to environment. Due to various disadvantages present in the way of conventional deacidification the"green solvent"-ionic liquid and the way of hyrodeacidification were used as the alternative methods to remove the naphthenic acid from the distillate oil in this study.In this paper, the [bmim]OH was firstly selected as the deacidification agent from [bmim]BF4, [bmim]OH and [emim]OH. At the same time, the alcohol was chosen as the assistant agent by evaluating the assistant deacidification agent. In the experiment, the No. 2 vacuum cut of cnooc was our sample oil. The optimal operation conditions were obtained by the experiment of the factor influencing the deacidification effect. The result indicated that the removal rate is higher than 76% when the concentration of depickling solvents is 0.1g.ml-1. The ration of solvent to oil is 1:1, the depickling temperature is 40℃and the reaction time is 50min.On the basis of the deacidification experiment, the callback research was carried out as well. Mainly study the hydrolyzing callback and the acidification callback. The experiment indicated that acidification callback has the advantages of the high acid number, short reaction time. In hydrodeacidifiction research, RL-1 was the experimental catalyst and the experimental stock were the atmospheric cut 3 and the vacuum cut 3 distillate oil, the influential factors were decided in partial pressure of hydrogen of 3.2MPa and 6.4MPa, The experimental result show that hydrodeacidification has high deacidification rate, high yield and the hetero atoms can be removed by this way...