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Heteropolyacid ionic liquid and application of heteropolyacid ionic liquid in oxidative desulfurization

An ionic liquid and oxidative desulfurization technology, which is applied in the fields of refining oxygen-containing compounds, organic chemistry, chemical instruments and methods, etc., can solve problems such as difficulty in obtaining diesel oil and difficult removal of sulfur, and achieve short reaction time, high selectivity, The effect of reducing dosage

Inactive Publication Date: 2015-05-06
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sulfur in gasoline is easily oxidized and removed, while the sulfur in diesel is relatively difficult to remove. It is difficult to obtain diesel with a sulfur content that meets the Euro V standard by using this ionic liquid.

Method used

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  • Heteropolyacid ionic liquid and application of heteropolyacid ionic liquid in oxidative desulfurization
  • Heteropolyacid ionic liquid and application of heteropolyacid ionic liquid in oxidative desulfurization

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 0.028g[C 18 h 20 N 4 o 4 ]H 2 PW 12 o 40 , 1,1'-[1,3-phenylenebis(methylene)]bis[3-(carboxymethyl)]-1H-imidazolium phosphotungstic acid, added to 15ml simulated diesel oil (where 4,6 dimethyldibenzothiophene, the sulfur content is 268 μg / g), then add 1.75ml H 2 o 2Aqueous solution (30% by mass), after magnetic stirring at 298K and normal pressure for 25min, take 1ml of oil in the upper layer and add 1ml of extractant N-methylpyrrolidone, shake fully and centrifuge in a centrifuge. After centrifugation, take the upper liquid and measure its sulfur content in a coulometric analyzer to be 48 μg / g, and the desulfurization rate is 82%. After the desulfurization is completed, the ionic liquid phase is separated, the ionic liquid is separated by simply pouring the ionic liquid phase, and it is vacuum-dried at 80° C. to obtain a regenerated ionic liquid, which can be reused.

Embodiment 2

[0027] 0.028g[C 18 h 20 N 4 o 4 ]H 2 PW 12 o 40 , 1,1'-[1,3-phenylenebis(methylene)]bis[3-(carboxymethyl)]-1H-imidazolium phosphotungstic acid, added to 15ml simulated oil (where 4,6 dimethyldibenzothiophene, the sulfur content is 226 μg / g), then add 1.75ml H 2 o 2 Aqueous solution (30%), after magnetic stirring at 303K and normal pressure for 25min, take 1ml of oil from the upper layer, add 1ml of extractant N-methylpyrrolidone, shake fully and centrifuge in a centrifuge. After centrifugation, take the upper layer liquid and measure its sulfur content in a coulometric analyzer to be 27 μg / g, and the desulfurization rate is 88%. After the desulfurization is completed, the ionic liquid phase is separated, the ionic liquid is separated by simply pouring the ionic liquid phase, and it is vacuum-dried at 80° C. to obtain a regenerated ionic liquid, which can be reused.

Embodiment 3

[0029] 0.028g[C 18 h 20 N 4 o 4 ]H 2 PW 12 o 40 , 1,1'-[1,3-phenylenebis(methylene)]bis[3-(carboxymethyl)]-1H-imidazolium phosphotungstic acid, added to 15ml simulated oil (where 4,6 dimethyldibenzothiophene, the sulfur content is 268 μg / g), then add 1.75ml H 2 o 2 Aqueous solution (30%), after magnetic stirring at 308K and normal pressure for 25min, take 1ml of oil from the upper layer and add 1ml of extractant N-methylpyrrolidone, shake fully and centrifuge in a centrifuge. After centrifugation, take the upper layer liquid and measure its sulfur content in a coulometric analyzer to be 17 μg / g, and the desulfurization rate is 93.7%. After the desulfurization is completed, the ionic liquid phase is separated, the ionic liquid is separated by simply pouring the ionic liquid phase, and it is vacuum-dried at 80° C. to obtain a regenerated ionic liquid, which can be reused.

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Abstract

The invention provides a method for preparing a phosphotungstate heteropolyacid ionic liquid and application of phosphotungstate heteropolyacid ionic liquid in diesel oxidative desulfurization. The ions in the ionic liquid comprise phosphotungstic acid anions having a Keggin structure and [C18H20N4O4]<+> organic cations and a catalyst has the general structure of 1,1'-[1,3-phenylenebis(methylene)]bis[3-(carboxymethyl)]-1H-imidazole dihydrogen phosphotungstate. The ionic liquid disclosed by the invention is used as an oil oxidation desulfurization catalyst and has the advantages of being small in usage amount, high in catalytic activity and fast in desulfurization speed and can be recycled and is easy to separate and the like.

Description

technical field [0001] The invention relates to a heteropolyacid ionic liquid and a synthesis method thereof, as well as the application of the heteropolyacid ionic liquid in deep catalytic oxidation desulfurization of oil products. Background technique [0002] With the development of industry and the popularization of automobiles, the demand for gasoline and diesel is increasing rapidly, and the proportion of diesel in fuel is increasing, and the sulfur compounds contained in it will cause serious environmental problems. The sulfide in diesel is one of the main sources of acid rain; the sulfide after combustion will poison the three-way catalyst of the engine exhaust purification system, and accelerate the corrosion and wear of the engine; in order to solve such environmental problems from the source, improve diesel The production of clean fuels has become a huge challenge for the refining industry. This brings great challenges to the deep desulfurization of oil products....

Claims

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Application Information

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IPC IPC(8): C07D233/56B01J31/18C10G27/12
CPCB01J27/188B01J31/0284C07D233/56C10G27/12
Inventor 桂建舟刘丹宁建梅程意如李艺彭坤
Owner TIANJIN POLYTECHNIC UNIV
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