Hydrocarbon oil sulfur-nitrogen compound remover, preparation method thereof and application thereof

Abstract

The invention relates to a hydrocarbon oil sulfur-nitrogen compound remover for selectively oxidizing and removing sulfide and nitride in hydrocarbon oil by using inorganic oxidant and organic acid, a preparation method thereof and application thereof. The remover consists of the inorganic oxidant and water soluble hydroxy acid according to a molar ratio of 1:1. A desulphurization and denitrification agent formed by the inorganic oxidant and the water soluble hydroxy acid is subjected to oxidation reaction with hydrocarbon oil fractions to convert the sulfide and the nitride in the hydrocarbon oil with weak polarity in the hydrocarbon oil into sulfur oxide and nitrogen oxide with strong polarity; and then the sulfur-nitrogen compounds with strong polarity in the oxidized sulfur oxide, thenitrogen oxide and the hydrocarbon oil are extracted from the hydrocarbon oil by using an organic solvent with strong polarity as an extracting agent so as to realize the separation of the sulfide, the nitride and the hydrocarbon oil. The method can remove the nitride at the same time of removing the sulfide in the hydrocarbon oil so as to improve the quality of the hydrocarbon oil; and the extracting agent can be recycled to reduce environment pollution.

Description

technical field [0001] The invention relates to a hydrocarbon oil sulfur and nitrogen compound remover for selectively oxidizing and removing sulfides and nitrogen compounds in hydrocarbon oil by using inorganic oxidants and organic acids, a preparation method and application thereof. Background technique [0002] Petroleum fractions often contain a certain amount of sulfur and nitrogen compounds at the same time. As we all know, nitrogen-containing compounds in petroleum will adversely affect secondary processing and product performance, easily poison catalysts, affect oil oxidation stability and poor storage stability. etc.; sulfur-containing compounds in petroleum will cause strong corrosion to metal equipment; in addition, light oil products containing sulfur and nitrogen compounds will emit SO 2 , NOx exhaust gas will seriously pollute the environment, destroy the ecological balance, and promote the formation of acid rain. [0003] Acid-base cleaning and refining is a ...

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Problems solved by technology

[0002] Petroleum fractions often contain a certain amount of sulfur and nitrogen compounds at the same time. As we all know, nitrogen-containing compounds in petroleum will adversely affect secondary processing and product performance, easily poison catalysts, affect oil oxidation stability and poor storage stability. etc.; sulfur-containing compounds in petroleum will cause strong corrosion to metal equipment; in addition, light oil products containing sulfur and nitrogen compounds will emit SO 2 , NOx exhaust gas will seriously pollute the environment, destroy the ecological balance, and promote the formation of acid rain

[0003] Acid-base cleaning and refining is a traditional method for removing sulfur compounds and nitrogen-containing compounds in hydrocarbon oil in the petrochemical industry. This method not only produces a large amount of acid-base residue in the process, which is harmful to the environment, but also the sulfur and nitrogen content of the refined oil cannot meet the international standards. Therefore, many researchers at home and abroad have proposed hydrogenation catalytic desulfurization, hydrogenation extraction-denitrification, plasma liquid phase oxidation desulfurization, organic acid extraction desulfurization and denitrification, complex extraction denitrification, ionic liquid extraction desulfurization and denitrification, Supercritical extraction desulfurization and denitrification, activated carbon adsorption desulfurization and denitrification, and microbial desulfurization and denitrification methods, among which the research on hydrogenation catalytic desulfurization and hydrogenation-extraction denitrification technology is relatively mature and has been well applied, but this method The main problems are harsh equipment requirements and high processing costs. In addition, due to steric hindrance effects, the removal rate of benzothiophene and dibenzothiophene is very low or even non-existent.

Although microbial desulfurization and denitrification have relatively mild requirements on process conditions, it is considered to be the most ideal desulfurization and denitrification method for hydrocarbon oil in the 21st century. The problem of biochemical reaction due to sufficient contact with substances and nitrogen compounds; the second is the problem of sufficient separation of microorganisms and hydrocarbon oil after biochemical desulfurization and denitrification

[0004] Organic acid extraction, complex extraction, ionic liquid extraction, supercritical extraction, and activated carbon adsorption have better removal effects on relatively strong polar sulfides and basic nitrogen compounds in hydrocarbon oils, while for weaker polar sulfur compounds The removal effect of nitrogen compounds, basic nitrogen compounds and non-basic nitrogen compounds is basically not, so the overall removal effect of these methods is not satisfactory; question

[0005] Journal of Petroleum University (Natural Science Edition), Vol. 25, No. 3, 2001, Lu Zhifeng, Zhan Fengtao, etc. in "Using H 2 o 2 -Organic Acid Oxidative Removal of Sulfur Compounds in Catalytic Cracking Diesel "disclosed that the sulfur compounds in catalytic cracking diesel were first oxidized with hydrogen peroxide-formic acid system, and then oxidized with acetonitrile, N, N-dimethylformaldehyde The oxidation products of benzothiophene and dibenzothiophene in diesel oil are mainly removed by solvent extraction such as amide and dimethyl sulfoxide. The total sulfur removal rate of catalytic diesel can only reach about 60%, and whether the agent has The denitrification effect is also not mentioned

However, acetic acid has high oil solubility and tends to mix with light hydrocarbons, so it may cause greater corrosion to downstream equipment, making it difficult to realize industrialization

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