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Adsorption and removal of sulfur dioxide in flue gas by double-shell zsm-5 molecular sieve

A ZSM-5, sulfur dioxide technology, applied in the field of air pollution control, can solve the problems of affecting the effect of desulfurization, affecting the diffusion of molecules, narrowing of microporous channels, etc., to achieve the effect of large removal rate, large specific surface area, and many adsorption active centers.

Active Publication Date: 2019-07-05
上海天鸿分子筛有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used ZSM-5 molecular sieve has narrow micropore channels and has a large mass transfer resistance when adsorbing and removing sulfur dioxide, which affects molecular diffusion and thus affects the desulfurization effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The method for double-shell ZSM-5 molecular sieve adsorption and removal of sulfur dioxide in flue gas comprises the following steps:

[0028] (1) First mix and stir tetrapropylammonium hydroxide and deionized water evenly, then add NaAlO2 and citric acid to mix and then add tetraethyl orthosilicate and sodium hydroxide drop by drop at the same time, after the dropwise addition, stir at room temperature 1h, then transferred to a reaction kettle, crystallized, centrifuged after crystallization, dried, and calcined at 500°C for 6h to obtain ZSM-5 molecular sieve; among them, tetrapropylammonium hydroxide, deionized water, citric acid, orthosilicon Acid tetraethyl ester, sodium hydroxide: NaAlO The mass ratio is: 9g: 9.95g: 0.15g: 19.75g: 5.67g: 0.302g;

[0029] (2) Mix and stir the ZSM-5 molecular sieve and alkaline substance aqueous solution evenly, then raise the temperature to 80°C, continue to stir and react for 200h, after the reaction is completed, centrifugally was...

Embodiment 2

[0033] The method for double-shell ZSM-5 molecular sieve adsorption and removal of sulfur dioxide in flue gas comprises the following steps:

[0034] (1) First mix and stir tetrapropylammonium hydroxide and deionized water evenly, then add NaAlO2 and citric acid to mix and then add tetraethyl orthosilicate and sodium hydroxide drop by drop at the same time, after the dropwise addition, stir at room temperature 2h, then transferred to a reaction kettle, crystallized, centrifuged after crystallization, dried, and roasted at 600°C for 3h to obtain ZSM-5 molecular sieve; among them, tetrapropylammonium hydroxide, deionized water, citric acid, orthosilicon Acid tetraethyl ester, sodium hydroxide: NaAlO The mass ratio is: 9.5g: 10.5g: 0.36g: 20.05g: 6.35g: 0.320g;

[0035] (2) Mix and stir ZSM-5 molecular sieve and alkaline substance aqueous solution evenly, then raise the temperature to 200°C, continue to stir and react for 5h, after the reaction is completed, centrifugally wash, d...

Embodiment 3

[0039] The method for double-shell ZSM-5 molecular sieve adsorption and removal of sulfur dioxide in flue gas comprises the following steps:

[0040] (1) First mix and stir tetrapropylammonium hydroxide and deionized water evenly, then add NaAlO2 and citric acid to mix and then add tetraethyl orthosilicate and sodium hydroxide drop by drop at the same time, after the dropwise addition, stir at room temperature 1.2h, then transferred to a reaction kettle, crystallized, centrifuged after crystallization, dried, and roasted at 500°C for 4h to obtain ZSM-5 molecular sieve; among them, tetrapropylammonium hydroxide, deionized water, citric acid, normal Tetraethyl silicate, sodium hydroxide: NaAlO The mass ratio is: 9.1g: 10.0g: 0.2g: 19.95g: 5.85g: 0.308g;

[0041] (2) Mix and stir the ZSM-5 molecular sieve and alkaline substance aqueous solution evenly, then raise the temperature to 100°C, continue to stir and react for 160h, after the reaction is completed, centrifugally wash, dr...

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Abstract

The invention discloses a method for adsorbing and removing sulfur dioxide in flue gas through a double-shell ZSM-5 molecular sieve. The method comprises the following steps: preparing the ZSM-5 molecular sieve by taking tetrapropylammonium hydroxide, citric acid, tetraethyl orthosilicate and sodium hydroxide as raw materials; enabling the prepared ZSM-5 molecular sieve to react with an aqueous solution of alkaline substances so as to obtain the double-shell ZSM-5 molecular sieve; and finally, contacting the prepared ZSM-5 molecular sieve and flue gas for removing sulfur. The method is high in sulfur removing efficiency, and the prepared double-shell ZSM-5 molecular sieve is large in contact area with flue gas, high in adsorption capacity and low in preparation cost.

Description

[0001] Technical field: [0002] The invention relates to the field of air pollution control, in particular to a method for adsorbing and removing sulfur dioxide in flue gas by double-shell ZSM-5 molecular sieves. [0003] Background technique: [0004] The sources of SO2 in the atmosphere fall into two categories: natural sources and anthropogenic sources. Emissions from natural sources account for about 1 / 3 of the total amount of SO2 in the atmosphere, including SO2 emitted during volcanic eruptions, SO2 produced by oxidation of H2S released from swamps, depressions, continental shelves, etc. SO2 etc. produced by decomposition and sulfate aerosols formed in the ocean through a series of changes in the atmosphere. Naturally produced SO2 is distributed globally and is emitted at low concentrations in a wide area. It is easily diluted and purified in the atmosphere. Generally, it does not cause serious air pollution and does not cause acid rain. Man-made emissions account for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/16B01J20/30B01D53/02
CPCB01D53/02B01D2253/106B01D2257/302B01D2258/0283B01J20/16
Inventor 温震烨
Owner 上海天鸿分子筛有限公司
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