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Method for extracting thiophene and benzothiophene simultaneously

A technology of benzothiophene and thiophene, which is applied in the field of simultaneous extraction of thiophene and benzothiophene, can solve the problem of no sulfide selectivity research, etc., and achieves the effects of mild operating conditions, environmental friendliness and high extraction efficiency

Inactive Publication Date: 2015-11-18
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current research results are: the extraction rate of benzothiophene is only 70.44% for the deep eutectic solvent composed of tetrabutylammonium chloride and propionic acid in a molar ratio of 1:2, and the extraction rate of tetrabutylammonium chloride and polyethylene glycol is only 70.44%. The extraction rate of benzothiophene is only 72.15% in the deep eutectic solvent composed of 1:2 molar ratio [10] , but there is no related report on the simultaneous extraction of thiophene and benzothiophene by deep eutectic solvents, and there is no related research on the selectivity of sulfides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 1.0002g of deep eutectic solvent composed of N,N-dimethyl-N-cyanoethylammonium propionate and tetrabutylammonium chloride (mass ratio 1:1), and the concentration is 1600ppm of thiophene, benzo The n-octane solution of thiophene was 1.0006g, stirred at 25°C for 5min, and the stirring rate was 800rpm. After standing for stratification, the concentrations of thiophene and benzothiophene in the n-octane layer were detected by gas chromatography, and p-thiophene, The extraction rates of benzothiophene were 51.29% and 71.54%, respectively.

Embodiment 2

[0031]Weigh 1.0064g of deep eutectic solvent composed of N,N-dimethyl-N-cyanoethylammonium propionate and tetrabutylammonium chloride (mass ratio 1:1), and the concentration is 1600ppm of thiophene, benzo The n-octane solution of thiophene was 1.0064g, stirred at 25°C for 20min, and the stirring rate was 800rpm. After standing for stratification, the concentrations of thiophene and benzothiophene in the n-octane layer were detected by gas chromatography, and p-thiophene, The extraction rates of benzothiophene were 57.01% and 73.91%, respectively.

Embodiment 3

[0033] Weigh 1.0000g of deep eutectic solvent composed of N,N-dimethyl-N-cyanoethylammonium propionate and tetrabutylammonium chloride (mass ratio 1:1), and the concentration is 1600ppm of thiophene, benzo The n-octane solution of thiophene was 0.9996g, stirred at 25°C for 60min, and the stirring rate was 800rpm. After standing for stratification, the concentrations of thiophene and benzothiophene in the n-octane layer were detected by gas chromatography, and p-thiophene, benzothiophene were calculated. The extraction rates of benzothiophene were 59.75% and 76.18%, respectively.

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Abstract

The invention relates to a method for extracting thiophene and benzothiophene simultaneously and belongs to the field of extraction separation. The method for extracting the thiophene and the benzothiophene simultaneously comprises steps as follows: an extracting agent is contacted with a mixture, wherein the extracting agent is a deep eutectic solvent comprising N,N-dimethyl-N-nitrilethyl ammonium propionate and tetrabutylammonium chloride in the mass ratio being 1:1; the mixture comprises the thiophene, the benzothiophene and normal octane. According to the method, the extraction efficiency is high, the selectivity is high, desulfurization rates of the thiophene and the benzothiophene can be up to 96.84% and 99.99%, and operation conditions are mild and environment-friendly.

Description

technical field [0001] The invention relates to a method for simultaneously extracting thiophene and benzothiophene, belonging to the field of extraction and separation. Background technique [0002] Sulfur content is one of the symbolic indicators of whether the fuel is clean. SOx, an important pollutant in motor vehicle exhaust, comes from the combustion of organic sulfur compounds in fuel. [1] , with the increasingly serious problem of air pollution and the continuous improvement of environmental protection awareness, motor vehicle exhaust emission regulations are becoming more and more stringent, reducing the organic sulfur content in fuel has become an important indicator for the improvement of fuel quality in countries all over the world [2] . At present, the sulfur content in fuel oil in our country is relatively high, and there is a lack of production methods for high-octane gasoline components. Therefore, the domestic gasoline octane number will have a downward tre...

Claims

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Application Information

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IPC IPC(8): C10G21/20
Inventor 李长平赵琪
Owner DALIAN UNIV
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