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Activated coal modified material for removing thiophen compounds in gasoline and method for preparing and using the same

A modified material and activated carbon technology, applied in chemical instruments and methods, refined hydrocarbon oil, petroleum industry, etc., can solve the problems of small adsorption capacity and adsorption selectivity of thiophene compounds, low adsorption desulfurization capacity and selectivity, and achieve Convenient adsorption, controllable oxygen content, and high adsorption selectivity

Inactive Publication Date: 2009-06-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing activated carbon materials have low adsorption capacity and selectivity for thiophene compounds, so the adsorption and desulfurization capacity and selectivity are not high when applied to the gasoline adsorption desulfurization process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: take by weighing 50g specific surface area is 1200m 2 / g, the particle size is 60 mesh coconut shell activated carbon, soak in the mixed acid of 250mL38wt% hydrochloric acid and 47wt% hydrofluoric acid, filter out activated carbon after soaking 20h. Wash the activated carbon with deionized water until the pH value of the washing solution reaches 7, immerse in 250 mL of sodium hydroxide solution with a concentration of 4 mol / L, soak for 1 hour, filter out the activated carbon, and wash with deionized water until the pH value of the washing solution is 7. Filter out the activated carbon, put it into a glass tube with an inner diameter of 10mm, a length of 600mm, and a sieve plate at the lower end. The mass concentration of the lower end is 10mg / L, and the flow rate is 0.5m 3 / h ozone-air mixed gas, wash the activated carbon with deionized water until the pH value of the washing solution is 7, filter out the activated carbon and dry it. Take 10 g of the prep...

Embodiment 2

[0031] Embodiment 2: take by weighing 50g specific surface area is 1500m 2 / g, the particle size is 20 mesh coconut shell activated carbon, immersed in the mixed acid of 250mL38wt% hydrochloric acid and 47wt% hydrofluoric acid, filter out the activated carbon after soaking for 30h, wash the activated carbon with deionized water until the pH value of the washing solution reaches 7. Immerse in 250mL sodium hydroxide solution with a concentration of 1mol / L, soak for 2h, filter out the activated carbon, and wash with deionized water until the pH of the washing solution is 7. Filter out the activated carbon, put it into a glass tube with an inner diameter of 10mm, a length of 600mm, and a sieve plate at the lower end. The mass concentration of the lower end is 15mg / L and the flow rate is 0.5m 3 / h ozone-air mixed gas, react for 0.5h, wash the activated carbon with deionized water until the pH value of the washing liquid is 7, filter out the activated carbon and dry it. Take 10 g o...

Embodiment 3

[0032] Embodiment 3: take by weighing 50g specific surface area is 800m 2 / g, the particle size is 160 mesh coconut shell activated carbon, immersed in 250mL of 38wt% hydrochloric acid and 47wt% hydrofluoric acid mixed acid, soaked for 30h and filtered out, and the activated carbon was washed with deionized water until the pH value of the washing liquid was neutral. Immerse in 250mL sodium hydroxide solution with a concentration of 1mol / L, soak for 3h, filter out the activated carbon, and wash with deionized water until the pH of the washing solution is 7. Activated carbon is filtered out, the mass concentration is 5mg / L, and the flow rate is 0.2m 3 / h ozone-air mixed gas, react for 0.5h, wash the activated carbon with deionized water until the pH value of the washing liquid is 7, filter out the activated carbon and dry it. Take 10 g of the prepared spherical activated carbon material, put it into an adsorption column, and at a temperature of 25 ° C, 150 mL of gasoline with a...

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Abstract

The invention relates to a method for modifying active carbon for removing thiophene compounds in gasoline. The technical proposal comprises that: ozone is used as an oxidizing medium to oxidation and modify the active carbon so as to obtain an active carbon adsorbing material with higher sulfur capacity. The method comprises: using a mixed acid of a hydrochloric acid and a hydrofluoric acid to remove ash from the active carbon, using deionized water to wash the active carbon to be neutral, soaking the active carbon in a 1 to 4mol / L sodium hydroxide solution, placing the active carbon in a reaction container after filtering, introducing 5 to 15mg / L ozone-air gas mixture, using the deionized water to wash the active carbon to be neutral, and performing filtering and drying to obtain the active carbon adsorbing material with higher sulfur capacity. Compared with non-modified active carbon, the active carbon modified by the method obviously improves the sulfur capacity of the thiophene compounds in the gasoline, and can be applied to absorption and desulfurization processes of the gasoline; at normal temperature and normal pressure, the active carbon can absorb and remove the thiophene compounds in the gasoline, and the removal rate is more than 80 percent; and in the recycling process, the efficiency of the active carbon is almost kept unchanged.

Description

technical field [0001] The invention relates to a modified activated carbon material and its preparation method and application method, in particular to an ozone oxidation modified activated carbon material used for removing thiophene compounds in gasoline and its preparation method and application method. Background technique [0002] Gasoline contains a variety of sulfur-containing compounds, including mercaptans, sulfides, disulfides, thiophene and benzothiophene derivatives, etc. The sulfur dioxide generated after combustion not only causes corrosion of parts and poisons catalysts for the conversion of motor vehicle exhaust, but also It can cause serious environmental problems such as acid rain. Therefore, research on desulfurization of gasoline as a motor vehicle fuel is of great significance. [0003] Among various gasoline desulfurization methods, adsorption desulfurization is a treatment method with low cost and easy operation. Porous adsorbents with special surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C10G25/00
Inventor 郑经堂于维钊蔡升张玉贞李涛江李石曲险峰赵玉翠刘颖
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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