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Extractant and its oil extraction desulfurization method, application of a kind of ionic liquid

A technology of ionic liquid and extractant, which is applied in the application field of ionic liquid, can solve the problems of low desulfurization effect of extractant, high requirements for desulfurization process conditions, inconvenient separation, etc., and achieve good desulfurization ability, good reproducibility, and recycling convenient effect

Active Publication Date: 2019-06-14
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a new type of extraction and desulfurization method for gasoline, diesel and other oil products in the prior art, as well as the low desulfurization effect of the extractant, high requirements for desulfurization process conditions, and inconvenient subsequent separation. Extractant for oil desulfurization, oil extraction desulfurization method, application of an ionic liquid

Method used

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  • Extractant and its oil extraction desulfurization method, application of a kind of ionic liquid
  • Extractant and its oil extraction desulfurization method, application of a kind of ionic liquid
  • Extractant and its oil extraction desulfurization method, application of a kind of ionic liquid

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Effect test

Embodiment 1

[0038] 20g[Emim][H 2 PO 4] and 20g of simulated gasoline containing sulfur (thiophene) 500ppm were added to the flask, heated to 50°C under normal pressure stirring, magnetic stirring for 3hr, stirring speed at 500rpm, standing for 2hr, and layering. The sulfur content and nitrogen content of the upper oil phase are accurately detected with a sulfur and nitrogen analyzer. The sulfur content in the upper oil phase dropped to 327ppm, and the single-stage desulfurization rate was 34.6%. The nitrogen content of the upper oil phase is 1.36ppm (the initial nitrogen content of the model oil is 1.35ppm), indicating that the solubility of the ionic liquid in the oil phase is negligible. After use, the ionic liquid phase is recovered and reused through vacuum distillation.

Embodiment 2

[0040] 20g[Bmim][H 2 PO 4 ] and 20g of simulated gasoline containing sulfur (thiophene) 500ppm were added to the flask, heated to 50°C under normal pressure stirring, magnetic stirring for 3hr, stirring speed at 500rpm, standing for 2hr, and layering. The sulfur content and nitrogen content of the upper oil phase are accurately detected with a sulfur and nitrogen analyzer. The sulfur content of the upper oil phase is reduced to 320ppm, and the single-stage desulfurization rate is 36.0%. The nitrogen content of the upper oil phase is 1.38ppm (the initial nitrogen content of the model oil is 1.35ppm), indicating that the solubility of ionic liquids in the oil phase is negligible. After use, the ionic liquid phase is recovered and reused through vacuum distillation.

Embodiment 3

[0042] 20g[Bmim][H 2 PO 4 ] and 20g of simulated gasoline containing sulfur (benzothiophene) 500ppm were added into the flask, heated to 60°C under normal pressure stirring, magnetic stirring for 3hr, stirring speed at 500rpm, standing for 2hr, and layering. The sulfur content and nitrogen content of the upper oil phase are accurately detected with a sulfur and nitrogen analyzer. The sulfur content in the upper oil phase dropped to 326ppm, and the single-stage desulfurization rate was 34.8%. The nitrogen content of the upper oil phase is 1.39ppm (the initial nitrogen content of the model oil is 1.35ppm), indicating that the solubility of the ionic liquid in the oil phase is negligible. After use, the sulfide in the ionic liquid is eluted by chloroform, and the stripping agent in the ionic liquid phase is separated by vacuum distillation, and the ionic liquid and stripping can be reused.

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Abstract

The invention discloses an extraction agent, an extraction and desulphurization method of oil products by using the extraction agent, and an application of ionic liquid. The extraction agent comprises hydrogen phosphate ionic liquid and / or hydrogen sulfate ionic liquid, wherein cations in the hydrogen phosphate ionic liquid and / or hydrogen sulfate ionic liquid are alkyl imidazoles cations; and the structural formulas of the alkyl imidazoles cations are as shown in the specification, wherein R1 is straight-chain or branched-chain alkyl of which the carbon atom number is 2-10. The extraction and desulphurization method using the extraction agent is good in desulphurization effect, low in requirements on desulfurization process conditions, simple in operational process, suitable for multi-stage extraction and convenient in subsequent separation, and the extraction agent can be recycled.

Description

technical field [0001] The invention relates to an extractant and its oil product extraction desulfurization method, and an application of an ionic liquid. Background technique [0002] The sulfur compounds in gasoline will not only affect the catalyst in the engine and exhaust processor of the car, but also produce SOx after combustion, causing air pollution and threatening human health. Therefore, all countries in the world have strict requirements on the sulfur content of gasoline, which has been gradually reduced to below 10ppm, and there will be a more stringent trend in the future. Although traditional hydrodesulfurization methods can effectively remove fatty sulfides in gasoline, they are less effective in removing aromatic sulfides, such as thiophene, benzothiophene, dibenzothiophene and their derivatives. In addition, the hydrodesulfurization method is prone to side reactions at higher temperatures and hydrogen pressures, resulting in a decrease in the octane numbe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G21/12C10G21/24C10G21/22
Inventor 漆志文宋震陈立芳叶银梅成洪业
Owner EAST CHINA UNIV OF SCI & TECH
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