CN-115646137-B - Organic amine desulfurizing agent capable of effectively reducing foaming problem

Abstract

The invention discloses an organic amine desulfurizing agent capable of effectively reducing foaming problems, which consists of 5-60wt% of a main absorbent, 2-40wt% of a matched absorbent, 2-30wt% of an additive and 30-60wt% of water, wherein the main absorbent is more than one of dihydroxyalkyl piperazine organic amine, the matched absorbent is more than one of monoalkyl piperazine organic amine and monohydroxy alkyl piperazine organic amine, the additive comprises 1.8-29.8wt% of acid, 0.1-2wt% of an antioxidant and 0.1-2wt% of a defoaming agent, and the addition amount of the acid is used for adjusting the pH value of the organic amine desulfurizing agent to be 5-6. The invention effectively solves the problem of foaming of the organic amine in the using process by matching the main absorbent and the auxiliary absorbent, and improves the comprehensive performance of absorption and desorption of the desulfurizing agent.

Inventors

• WANG BO
• HUANG YONGFENG
• ZHAO DAN
• DING TENG
• JIANG HUA

Assignees

• 北京北大先锋科技股份有限公司

Dates

Publication Date

20260512

Application Date

20221026

Claims (16)

1. 1. The organic amine desulfurizing agent for effectively reducing foaming problem comprises 30-50 wt% of main absorbent, 5-20 wt% of auxiliary absorbent, 2-30 wt% of additive and 30-60 wt% of water, wherein the main absorbent is more than one of dihydroxyalkyl piperazine organic amine, the auxiliary absorbent is monoalkyl piperazine organic amine or monoalkyl piperazine organic amine and monohydroxy alkyl piperazine organic amine, the auxiliary absorbent is added to increase the surface tension of the solution and reduce the time for defoaming, and the additive comprises 1.8-29.8 wt% of acid, 0.1-2 wt% of antioxidant and 0.1-2 wt% of defoaming agent, wherein the addition amount of the acid is used for adjusting the pH value of the organic amine desulfurizing agent to be 5-6.
2. 2. The organic amine desulfurization agent of claim 1, wherein the primary absorber is selected from one or more of a bis-hydroxyalkyl piperazine and a bis-hydroxyalkyl piperazinone.
3. 3. The organic amine desulfurization agent of claim 2, wherein the primary absorber is selected from one or more of N, N-dimethylol piperazine, N-dihydroxyethyl piperazine, N-dihydroxypropyl piperazine, N-dimethylol piperazinone, N-dihydroxyethyl piperazinone, and N, N-dihydroxypropyl piperazinone.
4. 4. The organic amine desulfurization agent of claim 1, wherein the complexing agent is selected from one or more of the group consisting of monoalkylpiperazine, monohydroxypiperazine, monoalkylpiperazinone, and monohydroxypiperazinone.
5. 5. The organic amine desulfurization agent of claim 4, wherein the complexing agent is selected from one or more of the group consisting of N-methylpiperazine, N-ethylpiperazine, N-propylpiperazine, N-hydroxymethylpiperazine, N-hydroxyethylpiperazine, N-hydroxypropylpiperazine, N-methylpiperazinone, N-ethylpiperazinone, N-propylpiperazinone, N-hydroxymethylpiperazinone, N-hydroxyethylpiperazinone, N-hydroxypropylpiperazinone.
6. 6. The organic amine desulfurization agent of claim 1, wherein the acid is one or more of phosphoric acid, boric acid, citric acid, nitric acid, sulfuric acid, and hydrochloric acid.
7. 7. The organic amine desulfurization agent of claim 1, wherein the antioxidant is selected from one or more of sodium sulfite, copper acetate, tertiary butyl hydroquinone, dodecyl hydroquinone, anthraquinone disulfonic acid, and sodium anthraquinone disulfonate.
8. 8. The organic amine desulfurization agent of claim 1, wherein the defoamer is selected from one or more of polydimethylsiloxane, ethylene glycol siloxane, polyoxypropylene ethylene oxide glycerol ether.
9. 9. A method for effectively reducing foaming problems of an organic amine desulfurizing agent is characterized in that a matched absorbent is added into an organic amine desulfurizing agent taking dihydroxyalkyl piperazine organic amine as a main absorbent to increase the surface tension of a solution and reduce the time for defoaming, the matched absorbent is monoalkyl piperazine organic amine or monoalkyl piperazine organic amine and monohydroxy piperazine organic amine, the organic amine desulfurizing agent consists of 30-50 wt% of the main absorbent, 5-20 wt% of the matched absorbent, 2-30 wt% of an additive and 30-60 wt% of water, wherein the additive comprises 1.8-29.8 wt% of an acid, 0.1-2 wt% of an antioxidant and 0.1-2 wt% of a defoaming agent, the addition amount of the acid is based on the adjustment of the pH value of the organic amine desulfurizing agent to 5-6, the main absorbent, the matched absorbent, the antioxidant and the defoaming agent are added into water to be stirred and dissolved, then the pH value is adjusted to 5-6 by using an acid, and the organic amine desulfurizing agent is obtained after the water is added.
10. 10. The method of claim 9, wherein the primary absorber is selected from one or more of a bis-hydroxyalkyl piperazine and a bis-hydroxyalkyl piperazinone.
11. 11. The method of claim 10, wherein the primary absorbent is selected from one or more of N, N-dihydroxymethylpiperazine, N-dihydroxyethylpiperazine, N-dihydroxypropylpiperazine, N-dimethylolpiperazinone, N-dihydroxyethylpiperazinone, and N, N-dihydroxypropylpiperazinone.
12. 12. The method of claim 9, wherein the complexing agent is selected from one or more of a monoalkylpiperazine, a monohydroxypiperazine, a monoalkylpiperazinone, and a monohydroxypiperazinone.
13. 13. The method of claim 12, wherein the complexing agent is selected from one or more of N-methylpiperazine, N-ethylpiperazine, N-propylpiperazine, N-hydroxymethylpiperazine, N-hydroxyethylpiperazine, N-hydroxypropylpiperazine, N-methylpiperazinone, N-ethylpiperazinone, N-propylpiperazinone, N-hydroxymethylpiperazinone, N-hydroxyethylpiperazinone, N-hydroxypropylpiperazinone.
14. 14. The method of claim 9, wherein the acid is one or more of phosphoric acid, boric acid, citric acid, nitric acid, sulfuric acid, and hydrochloric acid.
15. 15. The method of claim 9, wherein the antioxidant is selected from one or more of sodium sulfite, copper acetate, tertiary butyl hydroquinone, dodecyl hydroquinone, anthraquinone disulfonic acid, and sodium anthraquinone disulfonate.
16. 16. The method of claim 9, wherein the defoamer is selected from one or more of polydimethyl siloxane, ethylene glycol siloxane, polyoxypropylene ethylene oxide glycerol ether.

Description

Organic amine desulfurizing agent capable of effectively reducing foaming problem Technical Field The invention relates to the technical field of desulfurization treatment, in particular to a compound organic amine desulfurizing agent for circularly removing gas SO2 in flue gas (tail gas) to be treated. Background The existing industrial sulfuric acid tail gas treatment methods mainly comprise a wet method, a semi-dry method and the like, and the methods generally have the defects of low byproduct utilization value, secondary pollution, complex operation procedures and difficult tail gas reaching lower level. The renewable circulating desulfurization method becomes a hot point of research at home and abroad, and the organic amine desulfurization technology adopts amine liquid as an SO 2 absorbent, and completes the desulfurization task through the absorption and desorption processes. The technology has good absorption selectivity to SO 2, wide application range to the sulfur content of flue gas, the absorbent can be regenerated and recycled, the product is high-purity SO 2 with the purity of 99 percent, and the technology can prepare liquid SO 2 or sulfur and has stable market and market prospect. The flue gas desulfurization technology by the organic amine method has good development prospect. The CANSOLV flue gas desulfurization technology of Kang Shifu is successful compared with the renewable wet flue gas desulfurization technology, and the technology adopts diamine as an absorbent, uses strong acid to neutralize one of the strong alkaline amine groups, and uses the other weak amine group as a main functional group for sulfur dioxide absorption. The researches show that the piperazine organic amine has the advantages of high boiling point, less solvent volatilization loss, less corrosion to equipment and the like compared with ethylenediamine and alcohol amine. In the practical application process of organic amine desulfurization, the phenomena of amine liquid foaming and liquid blocking generally exist, so that entrainment is formed in an absorption tower, a large amount of desulfurizing agent is taken away by airflow, and the amine liquid is lost. And when severe, the absorption tower is flooded, so that the tower pressure fluctuates, the tower plate efficiency is reduced, and the separation effect is poor. The problem of reducing foaming of amine solutions is now critical to the widespread use of this technology. The Chinese patent of the invention, a renewable flue gas desulfurizing agent and application thereof (CN 201210449283.9), discloses that 1, 4-bis (2-hydroxypropyl) piperazine is taken as the main component of the desulfurizing agent, and the preparation process is simple, and has the advantages of high desorption rate, low energy consumption in the circulating process and the like. The Chinese patent of the invention discloses a renewable organic amine flue gas desulfurizing agent and a preparation method thereof (CN 201310673132.6), wherein 1- (2-hydroxyethyl) -4- (2-hydroxypropyl) piperazine is the main component of the flue gas (tail gas) desulfurizing agent to be treated, and the synthetic separation process is simple and is not easy to crystallize. However, the above flue gas desulfurization agents have problems of easy foaming and difficult defoaming. Disclosure of Invention In order to solve the problem of foaming of organic amine in the using process and improve the comprehensive performance of absorption and desorption of the desulfurizing agent, the invention provides the organic amine desulfurizing agent which effectively reduces the problem of foaming. The invention provides an organic amine desulfurizing agent for effectively reducing foaming problem, which consists of 5-60 wt% of main absorbent, 2-40 wt% of auxiliary absorbent, 2-30 wt% of additive and 30-60 wt% of water, wherein: the main absorbent is more than one of dihydroxyalkyl piperazine organic amine, and the content of the main absorbent in the organic amine desulfurizing agent is preferably 30-50 wt%, and most preferably 30-40 wt%. The auxiliary absorbent is more than one of monoalkyl piperazine organic amine and monohydroxy alkyl piperazine organic amine, and the content of the auxiliary absorbent in the organic amine desulfurizing agent is preferably 5-20 wt%, and most preferably 5-15 wt%. The additive comprises 1.8-29.8 wt% of acid, 0.1-2 wt% of antioxidant and 0.1-2 wt% of defoamer (based on the total weight of the organic amine desulfurizer), wherein the addition amount of the acid is based on the adjustment of the pH value of the organic amine desulfurizer to 5-6. And mixing and stirring the main absorbent, the auxiliary absorbent, the additive and the water uniformly to obtain the organic amine desulfurizing agent capable of effectively reducing the foaming problem. The organic amine desulfurizing agent provided by the invention has the advantages of low foaming height, high defoaming speed and high desorption