Oil oxidation-extraction desulfurization technique based on ionic liquid composite solvent

Abstract

The invention relates to a new method of desulfurization for oil products and solvent recovery, comprising the following steps of: oxidizing sulfide in the oil products by organic or inorganic peroxide, then compositing imidazole ionic liquid and alcohols or alcamines and alcohols derivate or alcamines derivate according to a definite proportion, which are used as desulfurizer, and extracting and removing the oxide of organic sulfur or inorganic sulfur in the oil products. At the same time, the added ironic liquid has the advantages of designable structure and polarity, so the new method can improve the desulfurization degree above 98 percent, after desulphurizinig heavy oil with higher boiling point, performing the solvent recovery by back-extracting alcohols, alcamines, ethers, nitriles with lower boiling point and the derivates of alcohols, alcamines, ethers and nitriles, while light oil with lower boiling point can perform the solvent recovery by means of reduced pressure distillation.

Description

Technical field: [0001] The present invention relates to oxidizing the sulfide in the oil product under catalytic oxidation conditions, then compounding the ionic liquid and the organic solvent to form an extraction desulfurizer to extract the sulfide in the oil product, and then recovering the extractant for repeated use A new method for oil desulfurization. Background technique: [0002] With the depletion of crude oil resources and the increasingly fierce market competition, the blending ratio of high-sulfur crude oil has increased year by year, and the sulfur content of FCC feedstock oil has also increased, resulting in the continuous increase of sulfur content in subsequent refined oil. Therefore, desulfurization of oil products The problem is increasingly pressing. Therefore, research on low-cost and high-efficiency methods to reduce the sulfur content of oil products has become an urgent task for my country's oil refining industry. [0003] As a green solvent, ionic...

AI Technical Summary

Problems solved by technology

However, this kind of method has the disadvantages of low desulfurization efficiency, large amount of ionic liquid, high viscosity, high residual content of ionic liquid in the oil, which affects the quality of the oil, and high desulfurization cost, so it is difficult to get better application in industry.

However, traditional oxidative desulfurization mostly uses alcohol or alcohol amine organic solvents as extraction agents, which generally have the disadvantages of low desulfurization efficiency, easy volatilization of organic solvents, causing secondary pollution, and large loss of desulfurization agents.