Abstraction-catalytic oxidation desulfurization method using FeCl3

Abstract

The invention relates to a method for reducing sulfur content in fuel oil by extraction-catalysis hydrogen peroxide oxidation of FeCl3 ionic liquid, and the FeCl3 ionic liquid is extracting agent of sulfide in fuel oil and is also catalyst of sulfide for hydrogen peroxide oxidation. In the invention, on the conditions that the mass ratio of ionic liquid and fuel oil is in the range of 1:1 to 1: 5, the concentration of aqueous hydrogen peroxide solution is 5% to 30%, the reaction temperature is 30 to 60 DEG C and the reaction time is 5 to 30 minutes, the content of organic sulfur dibenzothiophene in analog oil product is reduced to be about 10 ppm in extraction coupling catalytic oxidation method. Compared with the traditional method, the method has the advantages of high desulfuration efficiency, short reaction time, simple reaction system, mild reaction conditions, no requirement for pressurized equipment, convenient separation, cycle use of ionic liquid, and the like.

Description

technical field [0001] The present invention relates to FeCl 3 Ionic liquid extraction-catalyzed hydrogen peroxide oxidation method to remove sulfide in fuel oil. Background technique [0002] During the combustion process of sulfur compounds in gasoline and diesel, a large amount of SO will be produced x , these harmful gases not only corrode the engine, but also cause irreversible poisoning of precious metal catalysts in exhaust gas treatment devices; sulfur dioxide and the like are the main causes of acid rain, which will cause large-scale environmental pollution and seriously threaten human health and the ecological balance of the earth . At present, the catalytic hydrodesulfurization method (HDS) commonly used in industry uses Co / Mo and Ni / Mo as catalysts to decompose oil by hydrogenation under high temperature (570K~620K) and high pressure (50~100atm) conditions. The sulfur compounds in the product are converted into H 2 S removed. Although HDS can effectively rem...

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Problems solved by technology

[0003] In 2001, ionic liquids were applied to extractive desulfurization research (Chem.Commun., 2001, 2494~2495), mainly reported in the literature (C 4 mimCl) / AlCl 3 The ionic liquid is mixed with the fuel oil, and then phase-separated with the fuel oil, which can remove organic sulfur such as dialkyl dibenzothiophene in the fuel oil, and the removal rate of sulfur is 50%, but (C 4 mimCl) / AlCl 3 Ionic liquids are unstable to water, and the literature also examines [C 4 mim]PF 6 , [C 4 mim] BF 4 , [C 4 mim][CF 3 SO 3 ] and [C 8 mim][OcSO 4 ] The removal effect of plasma liquid on fuel oil, the results show that the single extraction desulfurization rate is relatively low, about 30%

However, these desulfurization systems all belong to chemical oxidation, which consumes acidic substances during the reaction process and takes a long time to respond.

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