Method for removing SOx from gas with compound alcohol-amine solution

• US 9,999,852 B2
• Filed: 10/13/2014
• Issued: 06/19/2018
• Est. Priority Date: 10/15/2013
• Status: Active Grant

• Current Assignee: Beijing Boyuan Hengsheng High-Technology Co., Ltd., Peking University, Yongfeng Boyuan Industry Co., Ltd., Jiangxi Province
• Original Assignee: Beijing Boyuan Hengsheng High-Technology Co., Ltd., Peking University, Yongfeng Boyuan Industry Co., Ltd., Jiangxi Province
• Inventors: Wei, Xionghui, Zou, Meihua, Sun, Shaoyang, Sun, Yong, Liu, Jiaxu, Wang, Jun, Xiao, Jianbai, Li, Lifang, Chen, Li, Hu, Chun, Li, Xiangbin, Wan, Mingjin
• Primary Examiner(s): Lawrence, Frank
• Application Number:
  US15/028,260
• Publication Number:
  US 20160243491A1
• Time in Patent Office: 1,345 Days
• Field of Search: 95187, 95235, 4232421, 4232422, 4232423, 4232427
• CPC Class Codes: B01D 2252/2026 Polyethylene glycol, ethers or esters thereof, e.g. Selexol
• CPC Class Codes: B01D 2252/20478 Alkanolamines
• CPC Class Codes: B01D 2252/20494 Amino acids, their salts or derivatives
• CPC Class Codes: B01D 2258/0283 Flue gases
• CPC Class Codes: B01D 53/1425 Regeneration of liquid absorbents
• CPC Class Codes: B01D 53/1481 Removing sulfur dioxide or sulfur trioxide
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

A method for removing SO_x from a gas by using a compound alcohol-amine solution is provided. The compound alcohol-amine solution is made by mixing ethylene glycol and/or polyethylene glycol with hydroxyl and/or carboxyl organic compound having basic group containing nitrogen. The compound alcohol-amine solution is contacted with the gas containing SO_x to absorb the SO_x in the gas, wherein x=2 and/or 3. The compound alcohol-amine solution with absorbed SO_x is regenerated by one or more of heating method, vacuum method, gas stripping method, ultrasonic method, microwave method, and radiation method to release by-products of sulfur dioxide and sulfur trioxide, and the regenerated compound alcohol-amine solution is recycled for use. This method can be used for removing SO_x from flue gas, burning gas, coke-oven gas, synthesis waste gas from dyestuff plants, sewage gas from chemical fiber plants, and other industrial raw material gases or waste gases containing SO_x.

Claims

1. A method for removing SO_x from a gas, which comprises:

making a compound alcohol-amine solution by mixing ethylene glycol and/or polyethylene glycol with hydroxyl/carboxyl organic compound having basic group containing nitrogen, bringing the compound alcohol-amine solution into contact with the gas containing SO_x to absorb the SO_x in the gas, wherein x=2 and/or 3;

the hydroxyl/carboxyl organic compound having basic group containing nitrogen is one or more of hydroxyl organic compound having basic group containing nitrogen, carboxylic acid organic compound having basic group containing nitrogen, and carboxylate organic compound having basic group containing nitrogen, wherein the hydroxyl organic compound having basic group containing nitrogen is alcohol amine compound;

the carboxylic acid organic compound having basic group containing nitrogen is organic compound comprising both carboxylic acid group and amine group in a molecule; and

the carboxylate organic compound having basic group containing nitrogen is carboxylate organic compound comprising both carboxylic acid group and amine group in a molecule.

2. The method for removing SO_x from a gas according to claim 1, characterized in that, the hydroxyl organic compound having basic group containing nitrogen is selected from one or more of monomethanolamine, dimethanolamine, trimethanolamine, monoethanolamine, diethanolamine, triethanolamine, N,N-dimethyl ethanolamine, N,N-diethyl ethanolamine, N,N-diisopropyl ethanolamine, N-methyl diethanolamine, monopropanolamine, dipropanolamine, tripropanolamine, isopropanolamine, diisopropanolamine, triisopropanolamine, monobutanolamine, dibutanolamine, tributanolamine, N-hydroxyethylethylenediamine, N,N′

-dihydroxyethylethylenediamine, N,N-dihydroxyethyl aniline, N-ethyl-N-hydroxyethyl aniline, N-methyl-N-hydroxyethyl aniline, o-aminophenol, m-aminophenol, p-aminophenol, 2,4,6-tri(dimethylaminomethyl)phenol, 3-diethylaminophenol, 2-amino-5-nitrophenol, aminothiaoximoacid, N-methylpyrrolidinyl alcohol, 2,4-diamino-6-hydroxy pyrimidine, cyanuric acid, 2-(2′

-hydroxy-5′

-methylphenyl)benzotriazole, Gamma acid, J acid, phenyl J acid, Chicago acid and its salts, H acid and its salts, di-J acid, scarlet acid and its salts.

3. The method for removing SO_x from a gas according to claim 1, characterized in that, the carboxylic acid organic compound having basic group containing nitrogen is selected from one or more amino acids, EDTA, nitrilotriacetic acid, cyanoacetic acid, hippuric acid, o-aminobenzoic acid, o-aminophenylacetic acid, o-aminophenylpropionic acid, o-aminophenylbutyric acid, o-aminophenylpentoic acid, o-aminophenylhexylic acid, m-aminobenzoic acid, m-aminophenylacetic acid, m-aminophenylpropionic acid, m-aminophenylbutyric acid, m-aminophenylpentoic acid, m-aminophenylhexylic acid, p-aminobenzoic acid, p-aminophenylacetic acid, p-aminophenylpropionic acid, p-aminophenylbutyric acid, p-aminophenylpentoic acid, p-aminophenylhexylic acid, isonicotinic acid, and 2,3-pyrazine dicarboxylic acid.

4. The method for removing SO_x from a gas according to claim 1, characterized in that, the carboxylate organic compound having basic group containing nitrogen is selected from one or more amino acid salts, EDTA salts, nitrilotriacetic acid salts, cyanoacetic acid salts, hippuric acid salts, o-aminobenzoic acid salts, m-aminobenzoic acid salts, p-aminobenzoic acid salts, o-aminophenylacetic acid salts, m-aminophenylacetic acid salts, p-aminophenylacetic acid salts, o-aminophenylpropionic acid salts, m-aminophenylpropionic acid salts, p-aminophenylpropionic acid salts, o-aminophenylbutyric acid salts, m-aminophenylbutyric acid salts, p-aminophenylbutyric acid salts, o-aminophenylpentoic acid salts, m-aminophenylpentoic acid salts, p-aminophenylpentoic acid salts, o-aminophenylhexylic acid salts, m-aminophenylhexylic acid salts, p-aminophenylhexylic acid salts, isonicotinic acid salts, and 2,3-pyrazine dicarboxylic acid salts.

5. The method for removing SO_x from a gas according to claim 1, characterized in that, the mass percent content of the ethylene glycol and/or polyethylene glycol in the compound alcohol-amine solution is more than or equal to 50%, the mass percent content of the hydroxyl/carboxyl organic compound having basic group containing nitrogen is in the range of 0.1% to 30%, and the mass percent content of water is less than 20%.

6. The method for removing SO_x from a gas according to claim 1, characterized in that, the compound alcohol-amine solution contains a certain amount of additives being organic amines, amides, sulfones, sulfoxides, organic acids, organic acid salts, and metallorganic compounds;

the additives can be one or more of these substances; and

the additives are present in the compound alcohol-amine solution in a mass percent content of less than 10%.

7. The method for removing SO_x from a gas according to claim 1, characterized in that, the compound alcohol-amine solution absorbs the SO_x in the gas under a normal or increased pressure at an absorption temperature of −

20 to 80°

C.

8. The method for removing SO_x from a gas according to claim 1, characterized in that, the compound alcohol-amine solution with absorbed SO_x is regenerated by one or more of heating method, vacuum method, gas stripping method, ultrasonic method, microwave method, and radiation method at a regeneration temperature of 0 to 300°

C. to release sulfur dioxide and/or sulfur trioxide, and the regenerated compound alcohol-amine solution is recycled for use.

9. The method for removing SO_x from a gas according to claim 8, further comprising:

removing water from the compound alcohol-amine solution when a mass percent content of water in said solution is more than 20%, and

re-using the compound alcohol-amine solution into contact with the gas containing SO_x to absorb the SO_x in the gas.

10. The method for removing SO_x from a gas according to claim 1, characterized in that, the method is utilized to remove SO_x from flue gas, waste gas containing SO_x and/or industrial raw material gas.

11. The method for removing SO_x from a gas according to claim 9, wherein:

the compound alcohol-amine solution contains at least one additives selected from the group consisting of organic amines, amides, sulfones, sulfoxides, organic acids, organic acid salts, and metallorganic compounds; and

the at least one additives are present in the compound alcohol-amine solution in a mass percent content of less than 10%.

12. The method for removing SO_x from a gas according to claim 11, characterized in that, the hydroxyl organic compound having basic group containing nitrogen is selected from one or more of monomethanolamine, dimethanolamine, trimethanolamine, monoethanolamine, diethanolamine, triethanolamine, N,N-dimethyl ethanolamine, N,N-diethyl ethanolamine, N,N-diisopropyl ethanolamine, N-methyl diethanolamine, monopropanolamine, dipropanolamine, tripropanolamine, isopropanolamine, diisopropanolamine, triisopropanolamine, monobutanolamine, dibutanolamine, tributanolamine, N-hydroxyethylethylenediamine, N,N′

-dihydroxyethylethylenediamine, N,N-dihydroxyethyl aniline, N-ethyl-N-hydroxyethyl aniline, N-methyl-N-hydroxyethyl aniline, o-aminophenol, m-aminophenol, p-aminophenol, 2,4,6-tri(dimethylaminomethyl)phenol, 3-diethylaminophenol, 2-amino-5-nitrophenol, aminothiaoximoacid, N-methylpyrrolidinyl alcohol, 2,4-diamino-6-hydroxy pyrimidine, cyanuric acid, 2-(2′

-hydroxy-5′

-methylphenyl)benzotriazole, Gamma acid, J acid, phenyl J acid, Chicago acid and its salts, H acid and its salts, di-J acid, scarlet acid and its salts.

13. The method for removing SO_x from a gas according to claim 11, characterized in that, the carboxylic acid organic compound having basic group containing nitrogen is selected from one or more amino acids, EDTA, nitrilotriacetic acid, cyanoacetic acid, hippuric acid, o-aminobenzoic acid, o-aminophenylacetic acid, o-aminophenylpropionic acid, o-aminophenylbutyric acid, o-aminophenylpentoic acid, o-aminophenylhexylic acid, m-aminobenzoic acid, m-aminophenylacetic acid, m-aminophenylpropionic acid, m-aminophenylbutyric acid, m-aminophenylpentoic acid, m-aminophenylhexylic acid, p-aminobenzoic acid, p-aminophenylacetic acid, p-aminophenylpropionic acid, p-aminophenylbutyric acid, p-aminophenylpentoic acid, p-aminophenylhexylic acid, isonicotinic acid, and 2,3-pyrazine dicarboxylic acid.

14. The method for removing SO_x from a gas according to claim 11, characterized in that, the carboxylate organic compound having basic group containing nitrogen is selected from one or more amino acid salts, EDTA salts, nitrilotriacetic acid salts, cyanoacetic acid salts, hippuric acid salts, o-aminobenzoic acid salts, m-aminobenzoic acid salts, p-aminobenzoic acid salts, o-aminophenylacetic acid salts, m-aminophenylacetic acid salts, p-aminophenylacetic acid salts, o-aminophenylpropionic acid salts, m-aminophenylpropionic acid salts, p-aminophenylpropionic acid salts, o-aminophenylbutyric acid salts, m-aminophenylbutyric acid salts, p-aminophenylbutyric acid salts, o-aminophenylpentoic acid salts, m-aminophenylpentoic acid salts, p-aminophenylpentoic acid salts, o-aminophenylhexylic acid salts, m-aminophenylhexylic acid salts, p-aminophenylhexylic acid salts, isonicotinic acid salts, and 2,3-pyrazine dicarboxylic acid salts.

15. The method for removing SO_x from a gas according to claim 11, characterized in that, the mass percent content of the ethylene glycol and/or polyethylene glycol in the compound alcohol-amine solution is more than or equal to 50%, the mass percent content of the hydroxyl/carboxyl organic compound having basic group containing nitrogen is in the range of 0.1% to 30%, and the mass percent content of water is less than 20%.

16. The method for removing SO_x from a gas according to claim 11, characterized in that, the compound alcohol-amine solution absorbs the SO_x in the gas under a normal or increased pressure at an absorption temperature of −

20 to 80°

C.

17. The method for removing SO_x from a gas according to claim 11, characterized in that, the method is utilized to remove SO_x from flue gas, waste gas containing SO_x and/or industrial raw material gas.