Poly (tetramethylguandium acrylate) aqueous solution desulfurization agent and preparation method thereof

Abstract

The invention relates to a preparation method and an application method of poly (tetramethylguandium acrylate) desulfurization agent. The poly (tetramethylguandium acrylate) desulfurization agent can be used for flue gas desulfurization of a thermal power plant and a metallurgic plant, and has excellent selective absorption for sulfur dioxide as well as good lasting absorption property and multi-time cycle absorption and desorption stability. The desulfurization agent is characterized by comprising the components: poly (tetramethylguandium acrylate), water, antioxidant, corrosion inhibitor and defoaming agent. The preparation method comprises the steps of: adding solvent into a polymerizing pot, then adding initiator into the solvent, slowly heating to 120-140 DEG C when stirring, and dripping acrylic acid within 2-4h at the temperature of 120-140 DEG C; then removing the solvent under pressure reduction, and grinding to obtain polyacrylic acid; adding polyacrylic acid and water into a reaction flask and stirring; controlling the temperature to be 0-5 DEG C by ice-water bath, dripping 1,1,3,3-tetramethyl guanidine, reacting for 1h and then stopping the reaction; and adding right amount of antioxidant, corrosion inhibitor and defoaming agent, and evenly stirring to obtain poly (tetramethylguandium acrylate) aqueous solution, wherein the aqueous solution is the target desulfurization agent product.

Description

Technical field [0001] The invention relates to a polymer aqueous solution desulfurizer and an application method thereof, in particular to a desulfurizer with polyacrylic acid tetramethylguanidine as an absorbing component and an application method for absorbing sulfur dioxide in the form of its aqueous solution. technical background [0002] SO emissions in my country 2 90% comes from burning coal. A large amount of coal burning and other economic activities together lead to my country’s SO 2 Pollution and the resulting acid deposition pollution have caused a large area of ​​acid rain in my country, which has caused great harm to agriculture, industry and human ecology. The flue gas desulfurization technology is effective in controlling SO 2 One of the important measures of pollution. [0003] There are various flue gas desulfurization technologies, which are roughly divided into three types: wet flue gas desulfurization, semi-dry flue gas desulfurization and dry flue gas desulf...

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Problems solved by technology

Chinese patent CN101979128A prepares tetramethylguanidine by mixing and stirring 1,1,3,3-tetramethylguanidine and α-hydroxy acid, and then sequentially adding free radical inhibitors, metal ion complexing agents, viscosity reducers, etc. to the main species The small-molecule composite desulfurizer of guanidine hydroxy acid salt has the advantages of high desulfurization efficiency, high recovery value of by-products, minimal secondary pollution, regenerable and recyclable absorption liquid, etc., but its absorbent is a solvent-free absorbent. The cost is high, and the economic pressure on the owners of flue gas desulfurization in thermal power plants is great

Chinese patent CN1884315A neutralizes carboxyl-containing vinyl monomers and 1,1,3,3-tetramethylguanidine in a molar ratio of 1:1 to 1:2 to obtain 1,1,3,3-tetramethylguanidine guanidine-based cationic vinyl monomer, and then the cationic polymer of 1,1,3,,3-tetramethylguanidine can be obtained through free radical polymerization, which can be used as a solid desulfurizer to absorb sulfur dioxide and absorb High selectivity, large absorption capacity and fast speed, and the polymer desulfurizer can be recycled for many times, but the solid desulfurizer can only be used in the form of dry desulfurization in the application of desulfurization, and the utilization rate of the absorbent is unavoidable. shortcoming

Considering the disadvantage of low absorbent utilization rate of solid desulfurizers in industrial applications, there is no patent report on the use of tetramethylguanidine polyacrylate to remove sulfur dioxide from flue gas by wet desulfurization, which saves costs and makes up for dry Disadvantages of Desulfurization

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