Preparation method of absorbent used for removing mercury vapor pollutant

A mercury vapor and pollutant technology, applied in the field of adsorbent preparation, can solve the problems of poor selective removal effect, difficult large-scale industrial application, poor thermal stability, etc. The effect of stable performance

Inactive Publication Date: 2012-06-27
JIANGSU SIFANG BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the adsorbents used in dechlorination and mercury removal under relatively high temperature conditions at home and abroad are basically activated carbon adsorption materials, but activated carbon adsorbents have poor selective removal effect on low-level mercury vapor pollutants and poor thermal stability. High cost, difficult for large-scale industrial application
At present, non-carbon adsorbents with good removal effect on mercury vapor pollutants have not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Prepare bentonite, cetyltrimethylammonium bromide, dodecylamine, polyhexenol, and ethyl orthosilicate with a molar ratio of 1:20:20:5:150;

[0021] (2) Mix a bentonite suspension with a mass fraction of 1% and a concentration of 0.2mol / L cetyltrimethylammonium bromide at a temperature of 50°C for 24 hours;

[0022] (3) After mixing evenly, add dodecylamine and polyhexene alcohol and mix for 10 hours;

[0023] (4) Add ethyl orthosilicate until a precipitate forms;

[0024] (5) Dry the precipitate at 80°C for 12 hours;

[0025] (6) Heating at 400°C for 6 hours after drying;

[0026] (7) Prepare a mixed solution of titanium tetrachloride and aluminum trichloride at a molar ratio of 3:5. Soak the powder obtained in step (6) in the mixed solution and let it stand for 24 hours. In the mixed solution, bentonite and The molar ratio of titanium tetrachloride is 5:1;

[0027] (8) Add dilute ammonia water with an excess mass concentration of 5% dropwise for full reaction; ...

Embodiment 2

[0034] (1) Prepare bentonite, cetyltrimethylammonium bromide, dodecylamine, polyhexenol, and ethyl orthosilicate with a molar ratio of 1:30:20:10:180;

[0035] (2) Mix a bentonite suspension with a mass fraction of 2% and a concentration of 0.3mol / L cetyltrimethylammonium bromide at 50°C for 24 hours;

[0036] (3) After confirming that the mixture is uniform, add dodecylamine and polyhexene alcohol and mix for 24 hours;

[0037] (4) Add ethyl orthosilicate until the system has precipitation;

[0038] (5) Dry the mixture at 90°C for 12 hours;

[0039] (6) After drying, heat at 400°C for 6 hours to obtain powder;

[0040] (7) Prepare a mixed solution of titanium tetrachloride and aluminum trichloride at a molar ratio of 1:2. Soak the powder obtained in step (6) in the mixed solution and let it stand for 24 hours. In the mixed solution, bentonite and The molar ratio of titanium tetrachloride is 6:1;

[0041] (8) Add dilute ammonia water with an excess mass concentration of 2%...

Embodiment 3

[0048] (1) Prepare bentonite, cetyltrimethylammonium bromide, dodecylamine, polyhexenol, and ethyl orthosilicate with a molar ratio of 1:50:20:10:200;

[0049] (2) Mix bentonite suspension with a mass fraction of 1% and cetyltrimethylammonium bromide with a concentration of 0.5mol / L at 60°C for 24 hours;

[0050] (3) After confirming that the mixture is uniform, add dodecylamine and polyhexene alcohol and mix for 24 hours;

[0051] (4) Add ethyl orthosilicate until the system has precipitation;

[0052] (5) Dry the mixture at 80°C for 12 hours;

[0053] (6) After drying, heat at 500°C for 6 hours to obtain powder;

[0054] (7) Prepare a mixed solution of titanium tetrachloride and aluminum trichloride at a molar ratio of 1:2, soak the powder obtained in step (6) in the mixed solution and let it stand for 24 hours. In the mixed solution, bentonite and tetrachloride The molar ratio of titanium chloride is 8:1;

[0055] (8) Add dropwise dilute ammonia water with an excess mas...

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PUM

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Abstract

The invention discloses a preparation method of an absorbent used for removing mercury vapor pollutants. The invention belongs to the technical field of chemical engineering. The method comprises steps that: bentonite, cetyl trimethyl ammonium bromide, dodecylamine, polyhexylene alcohol, and tetraethoxysilane are prepared; a bentonite suspension liquid is mixed with cetyl trimethyl ammonium bromide; the mixture is uniformly mixture, dodecylamine and polyhexylene alcohol are added to the mixture, and the obtained mixture is mixed; tetraethoxysilane is added to the mixture, until precipitate is formed; the precipitate is separated and dried, such that powder of the precipitate is obtained; a mixed solution of titanium tetrachloride and dialuminium trichloride is prepared; the prepared powder is soaked in the mixed solution; the mixed solution is stood; excess dilute ammonia water is dropped into the mixed solution, and a reaction is carried out for 12h; the obtained product is subject to drying treatment; the product is annealed, such that the absorbent is prepared. With the method, thermal stability of a system is greatly improved, and the method is environment friendly.

Description

technical field [0001] The invention relates to a preparation method of an adsorbent for removing mercury vapor pollutants, belonging to the technical field of chemical industry. Background technique [0002] Mercury vapor pollutants can cause fatal harm to the ecological environment and human health, and it is a harmful gas emitted in the air. In industry, it is necessary to solve the problem of mercury pollution removal in the process of preparing synthesis gas, high-temperature gas, various industrial incineration gases, and coal combustion power generation, and my country's coal consumption is large, and mercury pollution is particularly harmful to the environment. At present, the adsorbents used in dechlorination and mercury removal under relatively high temperature conditions at home and abroad are basically activated carbon adsorption materials, but activated carbon adsorbents have poor selective removal effect on low-level mercury vapor pollutants and poor thermal st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30B01J21/06B01J21/04B01D53/02B01D53/86B01D53/64
Inventor 李学林段绪强谢传玉常春梅闫海洲豆斌林高猛
Owner JIANGSU SIFANG BOILER
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