Denitrification method for heavy oil

Abstract

The invention relates to a denitrification method for heavy oil. The method includes: reacting a composite denitrification agent with heavy oil, and at the end of the reaction, separating the denitrification agent and denitrified oil. The reaction temperature is 20DEG C-150DEG C, the dosage of the denitrification agent accounts for 5-150% of the heavy oil volume. The denitrogenation agent is composed of component A, component B and component C. A is one or more of the complexing agent TiCl4, TiSO4, CuCl2, and FeCl3, B is one or more of oxalic acid, citric acid, and phthalic acid, and C is a solvent with a Hildebrand solubility parameter ranging from 4.7 to 6 and is one or more of cyclopentane, cyclohexane, methylcyclohexane, ethylcyclohexane, decahydronaphthalene, and tetrahydronaphthalene. In terms of mass ratio, A accounts for 10-30%, B accounts for 10-30%, and C accounts for 40-80%. At the end of the reaction, the denitrified oil and the denitrification agent can be separated by settlement separation. The method can reach a denitrogenation rate up to over 70% and a yield up to 65%.

Description

technical field [0001] The invention relates to a method for denitrification of heavy oil products with high nitrogen content, and relates to the removal of nitrogen compounds in atmospheric residual oil, vacuum residual oil, heavy gas oil, coal tar, shale oil and the like. Background technique [0002] The content of nitrogen compounds in petroleum is generally 0.05%-0.5%. The nitrogen content in petroleum increases sharply with the increase of the boiling point of the distillate, and most of them are concentrated in the heavy oil above 400 °C. The nitrides in petroleum can be roughly divided into two categories: basic nitrides and non-basic nitrides. Basic nitrogen compounds mainly include pyridine series, quinoline series, isoquinoline series and aniline; non-basic nitrogen compounds mainly include pyrrole series, indole series, carbazole series and amides. Generally speaking, basic nitrogen compounds in petroleum account for about 30% of the total nitrogen. Among the ...

AI Technical Summary

Problems solved by technology

Heavy oil products, especially atmospheric residual oil, vacuum residual oil and coal tar, usually have high density and viscosity. It is difficult to dissolve oil products by the above methods, and thus cannot achieve efficient denitrification. It can be considered that these methods are more important High-quality oil products are not easy to implement