Modification method of macroporous resin for adsorbing low-concentration sulfur dioxide in air

Abstract

The invention relates to a modification method of macroporous resin for adsorbing low-concentration sulfur dioxide in air. The method comprises the steps that macroporous polystyrene resin is sufficiently swelled in a three-necked flask by using dichloroethane; a methylal solution is added to an another three-necked flask, then a thionyl chloride solution is dropwise added to the flask, chloromethyl ether is generated after the solution reacts, and the mixed solution after the reaction is completely poured into the three-necked flask filled with resin; anhydrous zinc chloride powder is added to the three-necked flask filled with resin and used as a catalyst, a sufficient reaction is conducted, then cooling, filtration and extraction are conducted, and chloromethylation resin is obtained; then the chloromethylation resin is added to an organic solvent and binary organic tertiary amine, a sufficient reaction is conducted under a stirring state, cooling and filtration are conducted, and finally acetone is used for extraction to obtain the required amination resin. According to the modification method, an indirect chloromethylation reaction is adopted, the risk of touching chloromethylmethyl ether by operation personnel is greatly lowered, and the chloromethylation effect on the resin is stable. An amination reagent is organic tertiary amine which can react with sulfur dioxide molecules more sufficiently, and the capacity of adsorbing low-concentration sulfur dioxide by the resin is greatly improved.

Description

technical field [0001] The invention belongs to the field of air purification and environmental protection material development, in particular to a macroporous resin modification method for absorbing low-concentration sulfur dioxide in the air. Background technique [0002] As an acidic gas, sulfur dioxide is one of the main pollutants in the air. It can form acid rain and cause smog, which poses a huge threat to the living environment of humans, animals and plants. At the same time, sulfur dioxide in the air will accelerate the corrosion of metal electronic components such as circuit boards in the presence of water, affecting the normal production and operation of certain industries. Although with the help of the flue gas desulfurization device, the emission of sulfur dioxide in the flue gas can be effectively reduced, but its removal efficiency cannot reach 100%, and a small amount of sulfur dioxide will still be emitted into the atmosphere. Due to the large-scale use of ...

AI Technical Summary

Problems solved by technology

For the adsorption of sulfur dioxide, the commonly used modification method is to introduce primary or secondary amine groups to the pore surface of porous materials, and use the reaction mechanism of acid-base neutralization to improve the adsorption capacity of sulfur dioxide, but in dry or low humidity conditions However, due to the lack of water in the air, the effect of the adsorption mechanism is not ideal. Therefore, the present invention proposes a modification method of grafting tertiary amine groups to the pore surface of the macroporous resin, using tertiary amine groups and sulfur dioxide molecules The reaction mechanism of sharing electron pairs between them can improve the adsorption capacity of sulfur dioxide, so that it also has a better adsorption effect on sulfur dioxide under dry conditions, so as to achieve the purpose of removing low-concentration sulfur dioxide in the air

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