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Oxidation sweetening method based on Br*nsted acid ion liquid

An acid ionic liquid, oxidative desulfurization technology, applied in the direction of refining with oxygenated compounds, etc., can solve the problems of fuel oil pollution, catalyst loss, difficult recovery of acid catalysts, etc.

Inactive Publication Date: 2012-05-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has some disadvantages, for example, the commonly used acid catalyst is difficult to recover, and has a certain solubility in oil, which will cause catalyst loss and fuel oil pollution

Method used

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  • Oxidation sweetening method based on Br*nsted acid ion liquid
  • Oxidation sweetening method based on Br*nsted acid ion liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 6g [HSO 3 -bmim][HSO 4 ], 1-methyl-3-(4-sulfonic acid group) butylimidazole hydrogen sulfate, join in 12g simulated diesel oil (wherein sulfide is dibenzothiophene, sulfur content is 500ppm), then add 0.34g h 2 o 2 Aqueous solution (30%), after magnetic stirring at 363K and normal pressure for 1 hour, let stand, separate layers, and detect with high-performance liquid chromatography, the sulfur content in the fuel oil can be reduced to 48ppm, and the desulfurization rate is 90.4%. After the desulfurization is completed, the ionic liquid phase is separated, diluted with water, filtered, and the filtrate is distilled under reduced pressure at 80° C. and dried in vacuum to obtain a regenerated ionic liquid, which can be reused.

Embodiment 2

[0015] 6g [HSO 3 -bmim][HSO 4 ] join in 12g simulated diesel oil (wherein sulfide is dibenzothiophene, sulfur content is 515ppm), then add 0.34g H 2 o 2 Aqueous solution (30%), after magnetic stirring at 348K and normal pressure for 5 hours, let stand, separate layers, and detect with high-performance liquid chromatography, the sulfur content in fuel oil can be reduced to 13ppm, and the desulfurization rate is 97.5%. After the desulfurization is completed, the ionic liquid phase is separated, diluted with water, filtered, and the filtrate is distilled under reduced pressure at 80° C. and dried in vacuum to obtain a regenerated ionic liquid, which can be reused.

Embodiment 3

[0017] 6g [HSO 3 -bmim][HSO 4 ] into 12g simulated diesel oil (wherein the sulfide is dibenzothiophene, and the sulfur content is 497ppm), then add 0.34g H 2 o 2 Aqueous solution (30%), after magnetic stirring at 333K and normal pressure for 9 hours, let stand, separate layers, and detect with high-performance liquid chromatography, the sulfur content in fuel oil can be reduced to 3ppm, and the desulfurization rate is 99.4%. After the desulfurization is completed, the ionic liquid phase is separated, diluted with water, filtered, and the filtrate is distilled under reduced pressure at 80° C. and dried in vacuum to obtain a regenerated ionic liquid, which can be reused.

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Abstract

The invention relates to a method by adopting acid ion liquid as an extraction agent and catalyst and adopting superoxol (H2O2) as oxidant to oxidize and remove sulphocompound in fuel oil. Cation of acid ion liquid is imidazole, pyridine, quaternary ammonium and quaternary phosphonium (the cation contains carboxyl (-COOH) or sulfonic (-SO3H) acid functional groups), and anion is acid bisulfate ion [HSO4]- or dihydrogen phosphate [H2PO4]-. The removal rate of thiophene sulfate in the fuel oil reaches more than 90 percent. Compared with the traditional ion liquid extraction oxidation desulphurization method, the oxidation sweetening method is free from additional catalyst, so the weaknesses that the catalyst is difficult to recycle, the fuel oil is polluted by the catalyst and the like can be overcome, and the method is a novel oxidation desulphurization method and has wide application prospect in the real industry.

Description

technical field [0001] The present invention relates to a Acidic ionic liquid as extractant and catalyst, H 2 o 2 Aqueous solution is used as an oxidizing agent to oxidize and remove sulfur compounds in fuel oil. The fuel oil involved in the present invention includes semi-product oil (such as atmospheric and vacuum distillate oil, FCC gasoline, FCC diesel oil, thermally cracked gasoline, naphtha, fuel oil for boilers, etc.) in the petroleum refining process and commercially available refined oil (such as 93# gasoline, 97# gasoline, 5# diesel, aviation kerosene, etc.). Background technique [0002] Fuel oil usually contains a certain amount of sulfur compounds, which will be converted into SO during the combustion process X , SO X It is an important air pollutant. To give an example, with the rapid increase in the number of automobiles, automobile exhaust has become one of the main causes of air pollution. SO in exhaust X Not only will it cause acid rain, but it will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G27/12
Inventor 于光认赵晶晶陈晓春董婷婷
Owner BEIJING UNIV OF CHEM TECH
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