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Composite adsorbent

A composite adsorption and physical adsorbent technology, applied in the direction of silicon compounds, silicates, inorganic chemistry, etc., can solve the problems of cheap and expensive adsorbents, affecting air quality, etc., and achieve the effect of fixing and final removal Effect

Inactive Publication Date: 2016-10-19
SHANGHAI RONGYI INVESTMENT MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the desulfurization and denitrification efficiencies in industrial waste gas treatment are generally low, and considerable capital and equipment are required to further improve these efficiencies, and the precious metal catalysts used in automobile exhaust gas purification are also relatively expensive
Therefore, to achieve SO by existing technology 2 and / or NO 2 The emission reduction is not only costly, but also difficult to achieve the desired effect in a short period of time.
[0007] And, even so, according to the prior art, the SO in industrial waste gas and automobile exhaust 2 and / or NO x It is also difficult to achieve 100% purification rate, therefore, there will always be a certain amount of SO 2 and / or NO x It is emitted into the atmosphere, which will affect the air quality and ultimately affect people's living environment
[0008] For air purification, adsorbents such as activated carbon and molecular sieves can be used to remove SO at room temperature. 2 and / or NO x , but the saturated adsorption capacity of this kind of adsorbent is generally 0.02g (SO 2 and / or NO x ) / g (adsorbent), and the adsorbed SO 2 and / or NO x It needs to be further processed by absorption after desorption by heating up, and the price of this kind of adsorbent is generally not cheap, and it is still relatively expensive when used in large quantities.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0044] Mix activated carbon, calcium oxide and asphalt uniformly in a weight ratio of 1:1:0.3, wherein the porosity of the activated carbon is 0.6, and the resulting mixture is pressed into a ball with a diameter of 30mm at 250°C, and after cooling, a composite adsorption Agent 1 has a porosity of 0.44.

Embodiment 2

[0046] Mix SAPO-34 molecular sieve with calcium oxide and aluminum sol in a weight ratio of 0.4:1:0.1 (aluminum sol is calculated on a dry basis), wherein the porosity of SAPO-34 is 0.5, and a certain amount of water is added to the resulting mixture to form Paste, the obtained paste was dried at 140° C. for 24 hours, and after cooling, it was mechanically crushed into particles with a particle size of about 1 mm to obtain composite adsorbent 2 with a porosity of 0.38.

Embodiment 3

[0048] Mix 4A molecular sieve and SAPO-15 molecular sieve uniformly in a weight ratio of 2:3 as powder I, wherein the porosity of 4A molecular sieve and SAPO-15 molecular sieve are 0.45 and 0.48 respectively; use limestone powder as powder II; use water glass As a binder; use the rolling ball method to spray the binder into the powder II and roll it into a ball, add the prepared ball to the powder I and roll it into a ball while spraying the binder, and then add it to the powder II Repeat rolling into ball operation several times, finally finish rolling into ball process in powder I; Powder I consumed in rolling into ball process: powder II: the weight ratio of binding agent (dry basis) is 0.5:1:0.3, makes A multi-layered sphere with a diameter of 20-50 mm was obtained; dried at 150° C. for 20 h, and calcined at 500° C. for 4 h under a nitrogen atmosphere to obtain a composite adsorbent 3 with a porosity of 0.4.

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Abstract

The invention relates to a composite adsorbent. The composite adsorbent is used for removing acid gas NOx and / or SO2 in a gas mixture through adsorption and conversion. The composite adsorbent comprises a physical adsorbent and a chemical adsorbent, wherein the physical adsorbent is used for adsorption of acid gases as well as water molecules and oxygen contained in the gas mixture, the chemical adsorbent is used for carrying out a reaction for acid substances in the composite adsorbent, the weight ratio between the physical adsorbent and the chemical adsorbent is 0.1-5.0, and the porosity of the composite adsorbent is 0.2-0.85.

Description

technical field [0001] The invention relates to a method for removing acid gases such as NO from gas mixtures such as the atmosphere at normal temperature x and / or SO 2 and other composite adsorbents. Background technique [0002] Atmospheric acidic gases such as nitrogen oxides (NO x ) and sulfur dioxide (SO 2 ) etc. are very harmful. These acidic gases can not only form acid rain, but are also important substances that form photochemical smog in the atmosphere, and will deplete ozone, which will cause chronic and superimposed long-term harm to the human ecological environment. [0003] According to statistics, in 2013, SO in exhaust gas emitted by the whole of China 2 and NO x The content of smog has exceeded 20 million tons, which is at least part of the reason for the occurrence of smog in most parts of China to varying degrees, and the severe air pollution caused by smog has attracted widespread attention from the Chinese government and the international community ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/16B01J20/18B01D53/81B01D53/56B01D53/50B01D53/60
CPCY02A50/20
Inventor 魏小波韩国茹陈伟
Owner SHANGHAI RONGYI INVESTMENT MANAGEMENT
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