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Solvent for recovering SO2 from exhaust gas

A technology of SO2 and solvent, which is applied in the field of gas purification, can solve the problems of small absorption capacity, high regeneration energy consumption, and high solvent price, and achieve the effect of no secondary pollution and high absorption efficiency

Inactive Publication Date: 2018-03-27
江苏蓝电环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the above methods all have disadvantages such as small absorption capacity, high regeneration energy consumption, and high solvent price.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for recovering SO from industrial waste gas 2 The solvent consists of:

[0019] N,N-2-hydroxyethylpiperazine 16%, N-hydroxyethylpiperazine 48%, polyetheramine 24%; boric acid 4% and lactic acid 6%; 2-amino-2-methyl-1-propane 0.01% of alcohol, 0.02% of hydroxyethylidene diphosphonic acid and 0.02% of ethylenediaminetetraacetic acid; the above percentages are mass percentages.

[0020] The above-mentioned absorbent is formulated into a 25% by mass aqueous solution to treat 2 2000mg / Nm 3 gas, SO in the purified gas 2 30mg / Nm 3 .

Embodiment 2

[0022] A method for recovering SO from industrial waste gas 2 The solvent consists of:

[0023] N,N-2-hydroxyethylpiperazine 32.5%, N-hydroxyethylpiperazine 32.5%, polyetheramine 16%; boric acid 10% and lactic acid 10%; 2-amino-2-methyl-1-propane 0.05% of alcohol, 0.2% of hydroxyethylidene diphosphonic acid and 0.2% of ethylenediaminetetraacetic acid; the above percentages are mass percentages.

[0024] Make the above-mentioned absorbent into a 30% by mass aqueous solution to treat 2 16000mg / Nm 3 gas, SO in the purified gas 2 40mg / Nm 3 .

Embodiment 3

[0026] A method for recovering SO from industrial waste gas 2 The solvent consists of:

[0027] N,N-2-hydroxyethylpiperazine 30%, N-hydroxyethylpiperazine 40%, polyetheramine 20%; lactic acid 9.5%; 2-amino-2-methyl-1-propanol 0.1%, 0.2% of hydroxyethylidene diphosphonic acid and 0.2% of ethylenediaminetetraacetic acid; the above percentages are mass percentages.

[0028] The above-mentioned absorbent is formulated into a 15% by mass aqueous solution to treat 2 9000mg / Nm 3 gas, SO in the purified gas 2 25mg / Nm 3 .

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PUM

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Abstract

The invention discloses a solvent for recovering SO2 from exhaust gas. The solvent is prepared from a main absorbent, an auxiliary absorbent and an additive, wherein the main absorbent is prepared from N,N-2-hydroxyethyl piperazine, N-hydroxyethyl piperazine and polyether amine with the mass proportion being (1 to 2): (1 to 3): (0.5 to 1.5); the main absorbent accounts for 70 to 90 percent of themass proportion of a total absorbent; the auxiliary absorbent is one or a mixture of two of boric acid or lactic acid, and accounts for 0.5 to 10 percent of the mass proportion of the total absorbent;the additive is prepared from 2-amido-2-methyl-1-propanol, 1-hydroxyethylidene-1,1-diphosphonic acid and ethylenediamine tetraacetic acid with the mass proportion being (1 to 2): (2 to 4): (1 to 4),and accounts for 0.05 to 0.5 percent of the mass proportion of the total absorbent. The invention relates to a recyclable sulfur dioxide gas absorbent, which is high in absorption efficiency and freeof secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and in particular relates to a solvent for recovering sulfur dioxide from flue gas by using a solution. Background technique [0002] Acid deposition caused by sulfur dioxide and other acid gases has become an environmental problem of worldwide concern. Among them, the tail gas emitted by smelters, sulfuric acid plants, paper mills and other enterprises and the flue gas emitted by coal and oil combustion are important sources of sulfur dioxide in the atmosphere. In order to effectively suppress the increasingly serious pollution of sulfur dioxide and nitrogen oxides to the atmospheric environment, countries around the world, especially developed countries, have made long-term unremitting efforts and developed more than 200 desulfurization and denitrification technologies. SO 2 Control technology can be divided into pre-combustion desulfurization, desulfurization during combustion and po...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCB01D53/1481B01D53/1493B01D2252/504
Inventor 武斌林敏封俊
Owner 江苏蓝电环保股份有限公司
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