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Imidazolium-based ionic liquids and application thereof

An ionic liquid and imidazole technology, applied in the field of ionic liquid extraction, can solve the problems of desulfurization, high price and sensitivity of phenanthroline, and achieve the effects of high desulfurization rate and high recycling rate.

Active Publication Date: 2013-03-27
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Publication No. CN 101003742A uses imidazole phosphate ionic liquid as an extractant to remove sulfides containing thiophene rings, and uses water to regenerate the extractant. On the one hand, the trace water remaining in the ionic liquid will have a great impact on desulfurization. On the one hand, a small amount of water will affect the quality of the oil
[0005] In 2001, Boesmann et al. (Chem Commun, 2001, 2494-2495) synthesized and utilized AlCl 3 Ionic liquid removes sulfide in diesel oil, and after four-stage extraction, the desulfurization rate is 80%, but this kind of ionic liquid is sensitive to water and air, the desulfurization rate is not high, and it is easy to polymerize olefins in gasoline
However, the phenanthroline used is expensive and has no industrial application prospect
Although the traditional ionic liquid oxidation desulfurization can improve the desulfurization efficiency, it needs to increase the oxidant auxiliary workshop, which makes the desulfurization process more complicated

Method used

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  • Imidazolium-based ionic liquids and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Grind 0.15mol (29.8g) FeCl 2 4H 2 O was added to 0.1mol (19.1g) of brominated methyl ethylimidazole [EMIM]Br, with 38.2g of carbon tetrachloride as the reaction medium, under nitrogen protection, stirred at 50°C for 24h to fully react, after cooling The reactants are divided into three phases, and the intermediate layer is the synthesized ionic liquid. The Raman spectrogram of the ionic liquid prepared in this embodiment is as shown in Figure 1, as can be seen from the figure, there are various forms of the ionic liquid anion synthesized, wherein Fe 2+ It is the main anion form, and the Raman shift in the figure is 267cm -1 The Raman light intensity when FeCl 4 2- produced, FeCl 4 - with Fe 2 Cl 7 - The corresponding Raman shift is 330cm -1 、388cm -1 and 348cm -1 , Raman shift 243cm -1 The generation of Raman light intensity at the time is mainly attributed to the cation [EMIM] + .

[0021] The ionic liquid is used for extraction and desulfurization after...

Embodiment 2

[0023] The extraction time was 2 hours during extraction and desulfurization, and the other conditions were the same as in Example 1. The sulfur content was reduced to 166 μg / g, and the desulfurization rate was 51.9%.

Embodiment 3

[0025] The extraction desulfurization temperature is 30°C, other conditions are the same as in Example 1, the sulfur content is reduced to 175 μg / g, and the desulfurization rate is 49.3%.

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Abstract

The invention relates to imidazolium-based ionic liquids. The imidazolium-based ionic liquids are characterized by being prepared by utilizing the following method, and the method comprises the following steps in sequence: adding inorganic tetrahydrate ferrous chloride based on the mole ratio of imidazole bromide to inorganic tetrahydrate ferrous chloride of 1:(0.5 to 1.5) to the imidazole bromide; adding a reaction medium; and stirring for 10 to 24 hours at constant temperature of 35 to 55 DEG C under nitrogen protection, thus synthesizing into imidazolium-based ionic liquids. The invention provides an application of the imidazolium-based ionic liquids in an oil oxidation-extraction desulfurization technology. Compared with conventional preparation of the complex ion liquids, the preparation of the desulfurization imidazolium-based ionic liquids has the advantages that the cost is greatly reduced, the operation is simple and convenient, the reaction condition is mild, and the phenomena that the liquids are adhered to the wall, and the liquids appear burned black, can be prevented. Compared with conventional ionic liquids oxidation-extraction desulfurization, the oxidation-extraction desulfurization under imidazolium-based ionic liquids is high in desulfurization rate, and the imidazolium-based ionic liquids can be recycled at more than ten times.

Description

technical field [0001] The invention belongs to the technical field of ionic liquid extraction, and relates to an imidazole ionic liquid and its application; in particular, it relates to an imidazole ionic liquid and its application in extraction and desulfurization technology. Background technique [0002] With the development of the automobile industry, the use of gasoline worldwide continues to increase, and the exhaust gas emitted after combustion is also increasingly harmful to the environment. Sulfur oxides (SO X ) is one of the main causes of air pollution, SO in exhaust X Not only will it form acid rain, but it will also inhibit the effectiveness of automobile exhaust gas conversion catalysts, causing some catalysts to be poisoned and deactivated. For this reason, countries around the world have made strict regulations on the sulfur content of fuel oil. [0003] Catalytic hydrogenation is the most commonly used technology to remove sulfides in fuel oil in industry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/58C10G21/20
Inventor 吕效平俞星明陈科韩萍芳范珍龙
Owner NANJING UNIV OF TECH