Method for fuel oil extraction desulfurization by polyethyleneimine

Abstract

The invention relates to a method for fuel oil extraction desulfurization by polyethyleneimine. A polyethyleneimine extracting agent with the average molecular weight being 600 to 10000 and fuel oil are mixed and extracted according to a mass ratio being 0.2 to 3; 10 percent to 80 percent of organic sulfur in the fuel oil can be removed; and the oil product recovery rate is high; the selected extracting agent is not dissolved in the fuel oil; the oil pollution cannot be caused; the extracting agent cannot be lost; the regenerated cyclic utilization potential is realized. For the whole desulfurization process, the operation conditions are mild; high-temperature and high-voltages conditions are not needed; the operation is simple; the required equipment is not complicated, so that the desulfurization cost is low; the method is applicable to desulfurization treatment on various kinds of fuel oil such as high-boiling-range gasoline, aviation kerosene, vacuum gas oil and diesel oil.

Description

technical field [0001] The invention relates to the field of petrochemical technology, in particular to a method for using polyethyleneimine for extraction and desulfurization of fuel oil. Background technique [0002] Desulfurization of fuel oil is an important topic in petrochemical industry. For fuel oil, it contains a variety of organic sulfur compounds, such as sulfide, mercaptan, thiophene, methylthiophene, benzothiophene, methylbenzothiophene, dibenzothiophene, and methyldibenzothiophene. The mainstream desulfurization technology in the industry is hydrodesulfurization (HDS), which is widely used in the desulfurization of various oil products. HDS technology uses H 2 As a reactant, under the conditions of high temperature and high pressure and the presence of a catalyst, organic sulfur is converted into hydrocarbons and H 2 S, so as to realize the desulfurization of oil products. In addition, the S-zorb process is also a commonly used gasoline desulfurization tech...

AI Technical Summary

Problems solved by technology

Most of the extractants used in EDS technology are nitrogen-containing molecular solvents, such as N,N-dimethylformamide, N-methylimidazole, N-methylpyrrolidone, ionic liquids, etc. These extractants have some shortcomings that limit their use. For industrial applications, for example, although some extractants are not expensive, they are all soluble in oil, which not only increases the loss of extractants, but also introduces organic nitrogen into the oil, causing oil pollution; although ionic liquids are insoluble in oil, their cost is too high , and most ionic liquids have aromaticity, which leads to the extraction of some aromatics in the oil, thereby reducing the oil recovery rate; moreover, the anions of some ionic liquids contain elements such as Cl and F, which are also easy to cause corrosion of equipment