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Absorbent for recovering sulfur dioxide in waste gases and recovery method

A sulfur dioxide and absorbent technology, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve the problems of reduced adsorption efficiency of absorbents, corrosion of absorption equipment, increased manufacturing costs, etc. , the effect of less reactive substances

Inactive Publication Date: 2015-02-11
WUXI EPIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When there is oxygen, especially in high temperature environment, the organic amine salt solution is very easy to oxidize and decompose. The oxidatively decomposed organic amine salt solution will, on the one hand, greatly reduce or invalidate the adsorption efficiency of the absorbent; The absorption equipment causes corrosion, which greatly reduces the service life of the equipment and increases the manufacturing cost of the enterprise in disguise.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] An absorbent for reclaiming sulfur dioxide in exhaust gas, the absorbent is an organic amine salt solution added with an oxygen-resistant active agent, the oxygen-resistant active agent is N-hydroxyethylpiperazine, and the absorbent consists of the following Steps to make:

[0032] Step 1: Mix N-hydroxyethylpiperazine with water and stir evenly, add polymetallic hydrogen phosphate complex catalyst, heat, control the temperature at 300-400°C; then, cool down to 105-140°C, and stir Add ethylene oxide to react; the molar ratio of N-hydroxyethylpiperazine, ethylene oxide and water is 1:1:2.5.

[0033] Step 2: reacting the reaction product obtained in Step 1 with silicic acid to obtain an organic amine salt.

[0034] Step 3: Dissolve the organic amine salt obtained in Step 2 in water, then add N-hydroxyethylpiperazine, and stir evenly to prepare an aqueous solution of organic amine salt, and the preparation of the absorbent is completed.

[0035] The re...

Embodiment 2

[0037] An absorbent for reclaiming sulfur dioxide in exhaust gas, the absorbent is an organic amine salt solution added with an oxygen-resistant active agent, the oxygen-resistant active agent is N-hydroxyethylpiperazine, and the absorbent consists of the following Steps to make:

[0038] Step 1: Mix N-hydroxyethylpiperazine with water and stir evenly, add polymetallic hydrogen phosphate complex catalyst, heat, control the temperature at 300-400°C; then, cool down to 105-140°C, and stir Add ethylene oxide to react; the molar ratio of N-hydroxyethylpiperazine, ethylene oxide and water is 1:1.3:3.

[0039] Step 2: reacting the reaction product obtained in Step 1 with silicic acid to obtain an organic amine salt.

[0040] Step 3: Dissolve the organic amine salt obtained in Step 2 in water, then add N-hydroxyethylpiperazine, and stir evenly to prepare an aqueous solution of organic amine salt, and the preparation of the absorbent is completed.

[0041] The rec...

Embodiment 3

[0043] An absorbent for reclaiming sulfur dioxide in exhaust gas, the absorbent is an organic amine salt solution added with an oxygen-resistant active agent, the oxygen-resistant active agent is N-hydroxyethylpiperazine, and the absorbent consists of the following Steps to make:

[0044] Step 1: Mix N-hydroxyethylpiperazine with water and stir evenly, add polymetallic hydrogen phosphate complex catalyst, heat, control the temperature at 300-400°C; then, cool down to 105-140°C, and stir Add ethylene oxide to react; the molar ratio of N-hydroxyethylpiperazine, ethylene oxide and water is 1:1.4:3.5.

[0045] Step 2: reacting the reaction product obtained in Step 1 with silicic acid to obtain an organic amine salt.

[0046] Step 3: Dissolve the organic amine salt obtained in Step 2 in water, then add N-hydroxyethylpiperazine, and stir evenly to prepare an aqueous solution of organic amine salt, and the preparation of the absorbent is completed.

[0047] The rec...

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Abstract

The invention discloses an absorbent for recovering sulfur dioxide in waste gases and a recovery method. The absorbent is an organic amine salt water solution to which an oxygen-resistant activating agent is added, wherein the oxygen-resistant activating agent is N-hydroxyethyl piperazine. The absorbent is prepared by the following steps: I. mixing N-hydroxyethyl piperazine with water, stirring and heating the materials, adding a catalyst, then cooling the materials and adding ethylene oxide in a stirring state to react; II. reacting a reaction product obtained in the step I with silicic acid to obtain an organic amine salt; III. dissolving the organic amine salt obtained in the step II in water, then adding N-hydroxyethyl piperazine and stirring the materials uniformly, thus preparing an organic amine salt water solution. The recovery method is characterized in that the absorbent comes into reverse full contact with the waste gases and carries out absorption in an absorption tower to obtain a saturated absorbent; then the saturated absorbent is distilled or extracted to recover useful components in the absorbent, and the residual liquid obtained after recovery is recycled as an absorption liquid, so that the absorbent can be cyclically regenerated.

Description

technical field [0001] The invention relates to a waste gas recovery agent and a recovery method, in particular to an absorbent for recovering sulfur dioxide in waste gas and a recovery method. Background technique [0002] Sulfur dioxide is an important way of sulfur emission, one of the main gases of air pollution, and the source of acid rain. With the increasing requirements of environmental protection on the emission of air pollutants, in the flue gas desulfurization purification, how to reasonably select the desulfurization process, with low investment and operating costs, to achieve the emission of sulfur dioxide after flue gas desulfurization in line with the national emission standards, It is a key issue for the healthy development of flue gas desulfurization in coal-fired power plants and metallurgical industries. Therefore, the development of various high-performance sulfur dioxide absorbents is one of the research topics in this field. [0003] In flue gas desul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50C01B17/56
Inventor 尤为
Owner WUXI EPIC TECH
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