Process method for absorbing sulfur dioxide in flue gas by using aqueous carboxylate solution and regenerating absorbent at same temperature

Abstract

The invention discloses a process method for absorbing sulfur dioxide in flue gas by using an aqueous carboxylate solution and regenerating an absorbent at the same temperature. The process method comprises the following steps: with the aqueous carboxylate solution as the absorbent, under the conditions that the absorbing temperature is 25-60 DEG C and the concentration of the sulfur dioxide in the flue gas is 100-10000ppm, absorbing the sulfur dioxide gas in the flue gas, and then at the temperature equal to the absorbing temperature, under the stirring condition, inflating hydrogen sulfide, reacting with the sulfur dioxide in the absorbent to produce sulfur, recycling the sulfur through filtration or centrifugation to regenerate the absorbent, and reusing the regenerated absorbent. The process method has the advantages as follows: the absorbent is low in cost, pollution-free, good in stability and low in regeneration energy consumption; resource utilization of the sulfur dioxide is achieved.

Description

technical field [0001] The invention relates to a technical method for absorbing sulfur dioxide in flue gas with carboxylate aqueous solution and regenerating the absorbent at the same temperature. technical background [0002] Sulfur dioxide (SO 2 ) is one of the more harmful pollutants in the air pollutants, mainly from the combustion of coal. my country is a big coal-producing and coal-consuming country. Coal accounts for about 70% of primary energy consumption, most of which are used for direct combustion. Since coal contains about 1% sulfur, a large amount of sulfur dioxide is produced during the combustion process, and if the combustion flue gas is discharged directly, it will cause serious environmental problems. On the other hand, sulfur dioxide is a chemical raw material for the production of sulfur and sulfuric acid. my country is relatively short of sulfur resources. Every year, my country needs to import a large amount of sulfur and sulfuric acid for the produc...

AI Technical Summary

Problems solved by technology

The main disadvantages of this technology: (1) Since a large amount of low-grade gypsum is produced after desulfurization, it is difficult to use and becomes a de facto secondary pollutant, which restricts the application of this method to a certain extent; (2) every ton of sulfur dioxide treated , will emit 0.7 tons of carbon dioxide. Although the sulfur dioxide pollution in the flue gas is controlled, the emission of greenhouse gas carbon dioxide is increased; (3) the resource utilization of sulfur has not been realized

The main problems of ionic liquid absorption of sulfur dioxide in flue gas are: high cost of ionic liquid, poor stability of long-term use and high regeneration energy consumption, etc.