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Preparation method and application of ionic liquid and metal dual-modified sepiolite

A technology of ionic liquid and metal modification, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as incompleteness, change of sepiolite specific surface area, and sepiolite structure damage, and improve utilization efficiency, good economic benefits, and the effect of reducing desulfurization costs

Active Publication Date: 2015-06-24
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Summarizing domestic and foreign studies, it can be seen that the modification methods of sepiolite mainly include acid modification, ion exchange modification, organic complex modification and mineral modification, etc., but none of them are perfect.
Although acid modification can increase the thermal stability and specific surface area of ​​sepiolite, the structure of sepiolite is easily destroyed; although ion exchange modification overcomes the destruction of sepiolite structure by acid modification, it cannot be used To change the specific surface area of ​​sepiolite, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a. Pretreatment: mix the original sepiolite with 10 times the mass of water into an autoclave, stir at 150°C for 3 hours, filter with suction, dry at 105°C for 4 hours, and pulverize to obtain hydrothermally treated sepiolite; then hydrothermally treat the obtained Sepiolite was reacted with 10 times the mass of 6% hydrochloric acid at 25°C for 6 hours, filtered with suction, washed with water until neutral, and dried at 110°C for 4 hours to obtain hydrothermal-hydrochloric acid treated sepiolite;

[0030] b metal modification: immerse the sepiolite obtained in step a in a copper nitrate solution with a mass fraction of 20% for 4 hours, filter, wash the filter cake with an equal volume of water for 3 times, dry and roast at 550°C for 4 hours under the protection of nitrogen to obtain Copper modified sepiolite;

[0031] c Ionic liquid modification: At room temperature, react with caprolactam and tetrabutylammonium chloride respectively to generate tetrabutylammonium chlo...

Embodiment 2

[0034] a. Pretreatment: mix the original sepiolite with 10 times the mass of water into an autoclave, stir at 150°C for 3 hours, filter with suction, dry at 105°C for 4 hours, and pulverize to obtain hydrothermally treated sepiolite; then hydrothermally treat the obtained Sepiolite was reacted with 10 times the mass of 6% hydrochloric acid at 25°C for 6 hours, filtered with suction, washed with water until neutral, and dried at 110°C for 4 hours to obtain hydrothermal-hydrochloric acid treated sepiolite;

[0035] b metal modification: immerse the sepiolite obtained in step a in a copper nitrate solution with a mass fraction of 20% for 2 hours, filter, wash the filter cake with an equal volume of water for 3 times, dry and roast at 550°C for 4 hours under nitrogen protection, Obtain copper-modified sepiolite;

[0036]c Ionic liquid modification: At room temperature, react with caprolactam and tetrapentyl ammonium bromide respectively to generate caprolactam / tetrapentyl ammonium...

Embodiment 3

[0039] a. Pretreatment: mix the original sepiolite with 10 times the mass of water into an autoclave, stir at 150°C for 3 hours, filter with suction, dry at 105°C for 4 hours, and pulverize to obtain hydrothermally treated sepiolite; then hydrothermally treat the obtained Sepiolite was reacted with 10 times the mass of 6% hydrochloric acid at 25°C for 6 hours, filtered with suction, washed with water until neutral, and dried at 110°C for 4 hours to obtain hydrothermal-hydrochloric acid treated sepiolite;

[0040] b metal modification: soak the sepiolite obtained in step a in a nickel nitrate solution with a mass fraction of 18% for 5 hours, filter, wash the filter cake with an equal volume of water for 3 times, dry and roast at 550°C for 4 hours under nitrogen protection, Obtain nickel-modified sepiolite;

[0041] c Ionic liquid modification: At room temperature, react with caprolactam and tetraethylammonium bromide respectively to generate tetraethylammonium bromide / caprolact...

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Abstract

The invention relates to a preparation method and application of ionic liquid and metal dual-modified sepiolite. The preparation method comprises the following steps of: firstly carrying out hydrothermal-hydrochloric acid method pretreatment on the sepiolite serving as a raw material, then carrying out metal modification on the sepiolite by adopting an impregnation method, and then modifying the metal-loaded sepiolite by utilizing tetraalkyl ammonium halide / caprolactam ionic liquid to obtain the ionic liquid and metal dual-modified sepiolite. When the ionic liquid and the metal dual-modified sepiolite are used in the absorption-catalytic oxidation process of sulfur dioxide, the catalyst can perform high-efficiency absorption and catalytic oxidation on sulfur dioxide, sulfur trioxide is absorbed by 95% sulfuric acid, and sulfur resources are recycled. The preparation method is simple in process, modification cost is low, and application operation is simple and convenient. By utilizing the technology, recycling of the sepiolite and harmlessness and reduction of the sulfur dioxide can be realized.

Description

technical field [0001] The invention belongs to the field of non-metallic minerals and atmospheric environment, and in particular relates to a preparation method and application of ionic liquid and metal double-modified sepiolite. Background technique [0002] my country is a country with coal as the main energy source, and coal accounts for more than 80% of the energy structure. With the rapid growth of my country's economy, the acceleration of urbanization and the continuous growth of population, the demand for energy has also risen sharply, and the ensuing problem of sulfur dioxide pollution has become increasingly prominent. my country is the world's largest coal consumer and the largest sulfur dioxide emitter. At present, my country's air pollution is a typical soot-type pollution. Controlling sulfur dioxide emissions and acid rain hazards has always been an important task of environmental protection. The "National Environmental Protection "Twelfth Five-Year" Plan" pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J31/26B01J31/32B01D53/86B01D53/50
Inventor 段二红宋玉郭斌赵文霞梁伟朝
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY