A method for removing nitrogen from heavy oil

Abstract

The invention relates to a method for denitrification of heavy oil products; a compound denitrification agent reacts with heavy oil, and after the reaction is completed, the denitrification agent and denitrification oil are separated; the reaction temperature is 20°C-150°C, and the dosage of the denitrification agent Accounting for 5-150% of the volume of heavy oil, the denitrification agent consists of three components A, B and C: A is a complexing agent TiCl 4 、TiSO 4 , CuCl 2 , FeCl 3 B is one and several kinds of oxalic acid, citric acid, phthalic acid; C is a solvent whose solubility parameter of Hildebrand is between 4.7 and 6, and is cyclopentane, cyclohexane, One or several kinds of methylcyclohexane, ethylcyclohexane, decahydronaphthalene, and tetrahydronaphthalene; the mass ratio is 10-30% for A, 10-30% for B; 40-80% for C; After the reaction is completed, denitrification oil and denitrification agent are separated through sedimentation and separation; the denitrification rate of this method can reach more than 70%, and the yield can reach 65%.

Description

technical field [0001] The invention relates to a denitrification method for 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-containing 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 it is concentrated in the heavy oil above 400℃. Nitride in petroleum can be roughly divided into two categories: basic nitride and non-basic nitride. 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 total nitrogen. Among the petroleu...

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