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Preparation method of adsorbent for removing indoor low-concentration hydrogen sulfide

A low-concentration, hydrogen sulfide technology, applied in chemical instruments and methods, separation methods, alkali metal oxides/hydroxides, etc., can solve the problem that the desorption effect is not very obvious, the adsorption effect changes, and cannot be eliminated well Harmful gases and other problems, to achieve good chemical adsorption effect, increased adsorption effect, and obvious effect of material saving

Active Publication Date: 2015-09-30
烟台汇萃智能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because it mainly relies on physical adsorption, when the environment changes, its adsorption effect will change, and the desorption effect is not very obvious, and it cannot eliminate harmful gases in confined spaces.

Method used

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  • Preparation method of adsorbent for removing indoor low-concentration hydrogen sulfide
  • Preparation method of adsorbent for removing indoor low-concentration hydrogen sulfide

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preparation example Construction

[0020] The preparation method of modified 5A molecular sieve loaded zinc oxide chemical adsorbent comprises the following steps:

[0021] (1) 5A molecular sieve activation treatment: Grind 5A molecular sieve to powder at 25°C, add it to hydrochloric acid solution, and soak for 3 hours with magnetic stirring, then add Na 2 CO 3 The solution makes the mixture neutral.

[0022] More specifically, the activation method includes the following steps: grind 5A molecular sieve (spherical) to powder at room temperature, add it to 2mol / L hydrochloric acid, and mix and stir for 3 hours for activation treatment. 1mol / L Na 2 CO 3 The solution was added to a hydrochloric acid solution containing molecular sieves to neutralize. Then put it into a blast drying oven and dry at 105°C for 24 hours to obtain a dry product, grind it to a powder state and sieve it with a 200-mesh standard sieve to obtain a powder, which is ready for use.

[0023] (2) Modification of 5A molecular sieve: Weigh 2...

Embodiment 1

[0027] Grind the 5A molecular sieve (spherical) to powder at 25°C, add it into 2mol / L hydrochloric acid, and stir with magnetic force for 3h for activation. After adding Na 2 CO 3 solution to neutralize. Then the sample was put into a blast drying oven at 105°C for 12 hours to obtain a dry product, which was ground to a powder and sieved with a 200-mesh standard sieve to obtain a powder for use.

[0028] Preparation of the modified 5A molecular sieve carrier: Weigh 27g of ammonia water and add it to 300-400ml of deionized water, and stir at a constant temperature of 23-27°C for 15min. After that, 5-10 g of CTMAB was weighed and slowly added to the solution, and the stirring was continued for 15 min. Then, the dried 5A molecular sieve (8-12g) was slowly added to the mixture, and kept stirring at constant temperature for 15 minutes. Make the molecular sieve mix well. Weigh 30g of TEOS and add it dropwise to the stirred mixture (20-30min). Then stir at constant temperature ...

Embodiment 2

[0030] The 5A molecular sieve carrier was prepared as described in Example 1. Zinc nitrate was loaded on the prepared carrier according to ZnO10wt%. The modified 5A molecular sieve chemical adsorbent loaded with 10wt% ZnO was obtained by roasting in a muffle furnace (the roasting temperature was 400-450°C).

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Abstract

The invention provides a preparation method of an absorbent for removing indoor low-concentration hydrogen sulfide. 5A molecular sieves are ground into powder at the room temperature, added into a hydrochloric acid solution for soaking and then adjusted to neutral; 27g of ammonia water with the concentration of 25 wt% is added into 300-400 ml of deionized water, 5-10 g of hexadecyl trimethyl ammonium bromide is added, and the mixture is continuously stirred to obtain a mixed liquid; 8-12 g of activated 5A molecular sieves are added into the mixed liquid and stirred for 15 min, 30 g of tetraethyl orthosilicate is dropwise added and stirred for 1 hour at the constant temperature, and a modified 5A molecular sieve carrier is prepared through suction filtration, washing, drying and roasting; and zinc nitrate is loaded on the modified 5A molecular sieve carrier and roasted, and a chemical absorbent of a ZnO loaded modified 5A molecular sieve is obtained. The absorbent obtained by the invention has a larger specific surface area, a developed pore structure and a large absorption quantity, is low in cost, facilitates wide use, is used for removing low-concentration H2S, and is particularly suitable for removing hydrogen sulfide in closed space of the indoor, a cabin and the like.

Description

technical field [0001] The present invention relates to a method for preparing a hydrogen sulfide adsorbent, specifically a method for removing low-concentration H 2 A method for preparing a hydrogen sulfide adsorbent for S gas. Background technique [0002] Hydrogen sulfide is a highly irritating and toxic gas with the smell of rotten eggs, and it is one of the main pollutants in the atmosphere. It not only corrodes metal materials, but also pollutes the environment and endangers human health. Therefore, all countries have strictly controlled the emission standards of hydrogen sulfide, and my country stipulates that the emission concentration of hydrogen sulfide shall not exceed 0.01mg / m 3 , the removal of hydrogen sulfide, especially the removal of low-concentration hydrogen sulfide, is an urgent problem to be solved. In recent years, domestic and foreign scholars have carried out a lot of research work on the removal of low-concentration hydrogen sulfide. Airtight ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/28B01J20/30B01D53/02
Inventor 马福秋付家宽王桂香
Owner 烟台汇萃智能环保科技有限公司
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