High-efficiency desulfurizing combined solvent

Abstract

The invention relates to a high-efficiency desulfurizing combined solvent which is characterized by having extremely high absorption selectivity on an SO2 gas and higher velocity on the absorption and desorption of the SO2 gas. The high-efficiency desulfurizing combined solvent concretely comprises the following components: a first component, a second component and a third component, wherein the first component is a mixture or any single substance of substances, namely N-methyl pyrrolidone or dimethyl sulfoxide and the like, and the weight percent of the first component accounts for 0.1%-50% of the combined solvent; the second component a mixture or any single substance of polyamine, namely ethylene diamine, propane diamine, diethylenetriamine, triethylenetetramine, and the like which at least contain two amine groups, and piperazine, and the weight percent of the second component accounts for 0.1%-50% of the combined solvent; the third component is the balance of the combined solvent and contains a mixture or any single substance of other acids, namely phosphoric acid, boracic acid, citric acid, and the like, and water; the pH value of the combined solvent is regulated to 5-8. The high-efficiency desulfurizing combined solvent disclosed by the invention is low in volatility without waste gas and waste liquor discharge, can be recycled for multiple times by being desorbed and regenerated, can be used for desorbing the (dry basis) SO2 gas with the purity of 99% and is suitable for being used as an absorbent of the SO2 gas contained in a power plant waste gas.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, in particular to SO 2 Combination solvents for renewable and efficient desulfurization of gases. Background technique [0002] With the development of industrialization and automation in our country, the demand and consumption of energy in our country are obviously on the rise, and the pollution to the environment has also increased. In my country, it is mainly the combustion of sulfur-containing coal that causes SO in the flue gas 2 Gas emissions are also increasing day by day, resulting in an astonishing rate of development of acid rain. The pollution of acid rain not only has a huge impact on construction, agriculture and other industries, but also causes great harm to human health. In order to ensure the sustainable development of economy and environment and protect the healthy existence of human beings, effective measures should be taken to reduce SO in flue gas. 2 Gas em...

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Problems solved by technology

[0004] SO disclosed in Chinese patents 200910116568.9 and 200910116567.4 2 Absorbents use ionic liquids of linear or cyclic amines as renewable SO 2 Absorbent, since the absorbents used in these two patents are all ionic liquids, the absorption rate is low and the cost is high, which is not conducive to industrial application

A kind of SO containing hexamethylenediamine, hexamethylenediamine heavy component and dispersant disclosed in patent 03111216.1 2 Remover, which has the characteristics of low corrosion and low cost, but the absorption efficiency and absorption capacity of the remover are very low

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