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Method of applying dimethylamino modified pyridine ionic liquid in deep sulfur removal of oil

An ionic liquid, dimethylamine-based technology, applied in the petroleum industry, refined hydrocarbon oil, etc., can solve the problems of increased solubility of fuel oil, harsh conditions, high cost, etc., to improve the distribution coefficient, high distribution coefficient, and broaden the variety Effect

Inactive Publication Date: 2015-04-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the conventional industrial desulfurization process is hydrodesulfurization, and hydrodesulfurization has the following problems: 1) Harsh conditions: special catalyst is required, high temperature and high pressure (hydrogen pressure 2-10MPa); 2) Due to steric hindrance, for aromatics The removal of sulfides (thiophene, benzothiophene, dibenzothiophene and their derivatives) is difficult; 3) high cost
The groups used for cationic modification of arenes are usually alkyl groups (Gao, H.S.; Li, Y.G.; Wu, Y.; Luo, M.F.; Li, Q.; Xing, J.M.; Liu, H. Energy Fuels 2009, 23, 2690 -2694), but due to the non-polarity of the alkyl group, the solubility of the fuel oil in the ionic liquid will increase, and the melting point of the ionic liquid will also increase

Method used

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  • Method of applying dimethylamino modified pyridine ionic liquid in deep sulfur removal of oil
  • Method of applying dimethylamino modified pyridine ionic liquid in deep sulfur removal of oil
  • Method of applying dimethylamino modified pyridine ionic liquid in deep sulfur removal of oil

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 1.0g [C 2 4 DMAPy][N(CN) 2 ] was added to 1.0g simulated gasoline (the simulated gasoline was composed of 25% toluene, 30% hexene, 45% n-octane and thiophene with a sulfur content of 500ppm), at this time the ionic liquid was in the lower layer, the oil product was in the upper layer, and the Stir at room temperature for 30 minutes, stand still for 5 minutes to separate the simulated gasoline, and conduct gas chromatography analysis on the simulated gasoline after extraction and desulfurization. The sulfur content in the simulated gasoline is reduced to 261ppm, and the desulfurization rate of the simulated gasoline is calculated to be 47.8%. The extracted ionic liquid is back-extracted with carbon tetrachloride, the regenerated ionic liquid can be reused, and the extracted carbon tetrachloride is subjected to vacuum distillation at 333K to obtain regenerated carbon tetrachloride. 1.0g [C 2 4 DMAPy][N(CN) 2 ] with 1.0g of 97 # Gasoline was mixed, stirred at room te...

Embodiment 2

[0035] 1.0g [C 2 4 DMAPy][N(CN) 2 ] into 1.0g of simulated gasoline (the composition of simulated gasoline is 40% hexene, 60% n-octane and thiophene with a sulfur content of 500ppm), at this time, the ionic liquid is in the lower layer, and the oil product is in the upper layer, and stirred at room temperature After standing for 5 minutes, the simulated gasoline was separated, and the simulated gasoline after extraction and desulfurization was analyzed by gas chromatography. The sulfur content in the simulated gasoline was reduced to 232ppm, and the desulfurization rate of the simulated gasoline was calculated to be 53.4%. The extracted ionic liquid is back-extracted with carbon tetrachloride, the regenerated ionic liquid can be reused, and the extracted carbon tetrachloride is subjected to vacuum distillation at 333K to obtain regenerated carbon tetrachloride. The filtrate will be 1.0g [C 2 4 DMAPy][N(CN) 2 ] with 1.0g of 97 # Gasoline was mixed, stirred at room tempera...

Embodiment 3

[0037] 1.0g [C 2 4 DMAPy][N(CN) 2 ] was added to 5.0g simulated gasoline (the simulated gasoline was composed of 25% toluene, 30% hexene, 45% n-octane and thiophene with a sulfur content of 500ppm), at this time the ionic liquid was in the lower layer, the oil product was in the upper layer, and the Stir at room temperature for 30 minutes, stand still for 5 minutes to separate the simulated gasoline, and conduct gas chromatography analysis on the simulated gasoline after extraction and desulfurization. The sulfur content in the simulated gasoline is reduced to 408ppm, and the desulfurization rate of the simulated gasoline is calculated to be 18.2%. The extracted ionic liquid is back-extracted with carbon tetrachloride, the regenerated ionic liquid can be reused, and the extracted carbon tetrachloride is subjected to vacuum distillation at 333K to obtain regenerated carbon tetrachloride. 1.0g [C 2 4 DMAPy][N(CN) 2 ] with 1.0g of 97 # Gasoline was mixed, stirred at room te...

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Abstract

The invention discloses a method of applying dimethylamino modified pyridine ionic liquid in deep sulfur removal of oil. The method is characterized in that arene sulfide in separation oil is extracted by using the ionic liquid formed by dimethylamino modified pyridine positive ions and organic or inorganic negative ions as an extracting agent, wherein the mass ratio of the ionic liquid to the oil is (2:1)-(1:20), the extraction temperature is 288K-373K, the sulfur content in the oil is 10-1000ppm, and the content of arene in the oil is 0.01%-30%. According to the method, the pyridine positive ions are modified by adopting polar electron donating dimethylamino, the polarity of the dimethylamino can reduce the solubility of the fuel oil in the ionic liquid, and the electron donating property of the dimethylamino can increase the electron cloud density of arene pi on the pyridine positive ions, thus the distribution coefficient of the ionic liquid for extracting the arene sulfide is increased; therefore, a new thought for synthesizing the ionic liquid with the high distribution coefficient, low intersolubility and high selectivity is supplied.

Description

technical field [0001] The invention relates to the technical field of oil refining, in particular to a method for deep desulfurization of oil with a dimethylamino-modified pyridine ionic liquid. Background technique [0002] SO produced by combustion of sulfur compounds in fuel oil X Not only will it lead to irreversible poisoning of the catalyst for tail gas conversion, but it will also significantly reduce the reaction of the tail gas converter to hydrocarbons, NO X and particulate matter removal efficiency; and its discharge into the atmosphere will form acid rain and promote the formation of suspended particulate matter. Therefore, my country's requirements for the content of sulfide in fuel oil are becoming more and more stringent. At present, the conventional industrial desulfurization process is hydrodesulfurization, and hydrodesulfurization has the following problems: 1) Harsh conditions: special catalyst is required, high temperature and high pressure (hydrogen p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G21/06
Inventor 雷乐成王千里朱京科李中坚杨彬
Owner ZHEJIANG UNIV