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Method for deeply desulfurizing oil based on low viscosity ionic liquid

An ionic liquid and deep desulfurization technology, which is applied in the field of removing sulfur-containing compounds in oil products in the petrochemical field, can solve the problems of reducing the mass transfer rate in the extraction process, reducing the extraction amount, and high viscosity, achieving good reusability, The effect of mild desulfurization conditions and fast desulfurization rate

Inactive Publication Date: 2011-11-23
BEIJING UNIV OF CHEM TECH
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  • Summary
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  • Claims
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AI Technical Summary

Problems solved by technology

Although ionic liquids have shown good application prospects in the extraction of heterocyclic sulfides from oil, the viscosity of these ionic liquids is generally high (about 10 2 cp, about 2 orders of magnitude higher than conventional organic solvents), high viscosity will not only affect the handling of ionic liquids (such as transfer, transportation, mixing, etc.), but also reduce the dispersibility of ionic liquids and reduce the mass transfer in the extraction process rate, resulting in a longer extraction equilibrium time, in order to increase the mass transfer rate and reduce the extraction time, it is often necessary to increase the temperature, which in turn leads to high energy consumption and reduced extraction volume
Therefore, high viscosity has become a bottleneck restricting the application of ionic liquids in oil extraction and separation of heterocyclic sulfides

Method used

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  • Method for deeply desulfurizing oil based on low viscosity ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 3g[C 2 mim][dca](1-ethyl-3-methylimidazolium dicyanamide salt), added to 3g of simulated gasoline containing about 500ppm of sulfur (thiophene), stirred at 298K for 20min under normal pressure, and left to stand , layered, and detected by high-performance liquid chromatography, the sulfur content in the oil can be reduced to below 300ppm, and the desulfurization rate of a single extraction is as high as 40%. After the extraction and separation, separate the ionic liquid phase, dilute the ionic liquid phase with water, filter, distill the filtrate under reduced pressure at 80°C, and then vacuum dry at 80°C to obtain a regenerated ionic liquid, which can be reused.

Embodiment 2

[0016] 3g[C 2 mim][dca](1-ethyl-3-methylimidazolium dicyanamide salt), added to 3g simulated diesel oil containing sulfur (dibenzothiophene) about 500ppm, stirred at 298K for 20min under normal pressure , stand still, layered, and detected by high-performance liquid chromatography, the sulfur content in the oil can be reduced to below 230ppm, and the desulfurization rate of a single extraction is as high as 54%. After the extraction and separation, separate the ionic liquid phase, dilute the ionic liquid phase with water, filter, distill the filtrate under reduced pressure at 80°C, and then vacuum dry at 80°C to obtain a regenerated ionic liquid, which can be reused.

Embodiment 3

[0018] 3g[C 4 mim][dca](1-butyl-3-methylimidazolium dicyanamide salt), added to 3g of simulated gasoline containing about 500ppm sulfur (thiophene), stirred at 298K for 20min under normal pressure, and then left to stand , layered, and detected by high-performance liquid chromatography, the sulfur content in the oil can be reduced to below 210ppm, and the desulfurization rate of a single extraction is as high as 58%. After the extraction and separation, separate the ionic liquid phase, dilute the ionic liquid phase with water, filter, distill the filtrate under reduced pressure at 80°C, and then vacuum dry at 80°C to obtain a regenerated ionic liquid, which can be reused.

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Abstract

The invention provides a method for deeply desulfurizing oil based on a low viscosity ionic liquid. According to the invention, the low viscosity imidazole dicyanamide salt ionic liquid is used as an extractant for removing heterocyclic sulfur compounds from the oil. Compared with the traditional desulfurizing methods with ion liquid extraction, the method provided by the invention has mild desulphurization conditions, low desulphurization temperature and quick desulphurization speed, e.g. at normal temperature, the degrees of desulfurization in a single pass of thiophene and dibenzothiophene in 5 min respectively reach about 40% and 50%. The method has not only high desulphurization efficiency, but also the advantages of easiness in recovering and reusing of the ionic liquid, mild desulphurization conditions, environmentally friendly, simple process, convenient operation and easiness in realizing industrialization.

Description

technical field [0001] The invention relates to a method for removing sulfur-containing compounds in oil products in the field of petrochemical industry by using low-viscosity ionic liquid as an extractant. The oil products involved in the present invention include crude oil, semi-product oil (such as FCC gasoline, thermal cracking gasoline, boiler fuel oil, etc.) Wait). Background technique [0002] With the rapid increase of the number of motor vehicles, the combustion of sulfur-containing compounds in vehicle fuel oil (gasoline, diesel) generates SO X It has become one of the main causes of air pollution. For this reason, countries around the world strictly limit the sulfur content in fuel oil. At present, Europe and the United States require that the sulfur content be less than 10ppm (Euro IV), and China requires that the sulfur content is generally about 10 2 ppm (National II to National III, GB17930-1999, GB17930-2006), Beijing requires the sulfur content to be less ...

Claims

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Application Information

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IPC IPC(8): C10G53/06C10G21/20
Inventor 陈晓春李析于光认
Owner BEIJING UNIV OF CHEM TECH
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