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Absorbent and recovery method for recovering sulfur dioxide from industrial waste gas

A technology for sulfur dioxide and industrial waste gas, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of high regeneration energy consumption, high solvent price, and small absorption capacity, and achieve low regeneration energy consumption and low solvent price. Low, large absorption capacity effect

Active Publication Date: 2015-12-30
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

[0009] 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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  • Absorbent and recovery method for recovering sulfur dioxide from industrial waste gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In the reaction kettle equipped with a thermometer, agitator, feeder, and cooler, add 100mol of piperazine and 250mol of water in sequence, and after stirring evenly, replace the air in the reaction kettle with nitrogen and maintain the nitrogen flow, and drop Add 125 mol of ethylene oxide, drop it in 1 hour, react for another 3 hours, and control the reaction temperature to 80°C, the pressure during the reaction is 0.2MPa, then add 20g of boric acid to the reactant, and react for 0.5 hours to obtain an organic amine salt . The organic amine salt is dissolved in water to make an organic amine salt aqueous solution with a concentration of 20% by mass to obtain an absorbent.

Embodiment 2

[0033] In the reaction kettle equipped with a thermometer, agitator, feeder and cooler, add 100 mol of piperazine and 200 mol of water in sequence. After stirring evenly, replace the air in the reaction kettle with nitrogen and maintain the nitrogen flow. Add 120 mol of ethylene oxide, control the reaction temperature to 60°C, make the reaction pressure 0.1MPa, dropwise add in 1 hour, and then react for 2 hours, then add 18g of boric acid to the reactant, react for 1.5 hours to obtain organic amine salt . The organic amine amine salt is dissolved in water to prepare an organic amine salt aqueous solution with a concentration of 4% by mass to obtain an absorbent.

Embodiment 3

[0035] In the reaction kettle equipped with a thermometer, agitator, feeder, and cooler, add 100mol of piperazine and 400mol of water in sequence, and after stirring evenly, replace the air in the reaction kettle with nitrogen and maintain the nitrogen flow, and drop Add 150 mol of ethylene oxide, control the reaction temperature to 100°C, and make the reaction pressure 0.4 MPa, drop it in 1.5 hours, and then react for 3.5 hours, then add 20 g of boric acid to the reactant, and react for 3 hours to obtain organic amine salt . The organic amine amine salt is dissolved in water to prepare an organic amine salt aqueous solution with a concentration of 35% by mass to obtain an absorbent.

[0036] The specific absorption method is;

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Abstract

The invention particularly relates to an amine salt solution absorbent and a method for recycling sulfur dioxide from industrial waste gas. The absorbent is prepared by virtue of the following steps: firstly, mixing piperazine and water and uniformly agitating, and adding ethylene oxide to react under an agitating state; secondly, taking a reaction product and boric acid to react to obtain an organic amine salt; finally, dissolving the organic amine salt into water to prepare an amine salt water solution to obtain the absorbent. An absorption method comprises the following steps: carrying out countercurrent contact on the absorbent and a gas flow containing sulfur dioxide gas so as to dissolve the sulfur dioxide into the absorbent to remove the sulfur dioxide; meanwhile, contacting an absorption solution absorbing the sulfur dioxide with steam to be regenerated, so as to realize cyclic utilization. The preparation method is simple, the reaction efficiency is high, few reaction by-products are obtained, the yield is high, the price of a solvent is low, the period is short and the production cost is low; the capacity of the prepared absorbent is large and the sulfur dioxide can be completely recycle; the absorbent can be cyclically utilized and the regeneration energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and in particular relates to an amine salt solution absorbent and a method for recovering sulfur dioxide from industrial waste gas. Background technique [0002] Sulfur dioxide is an important way of sulfur emission and one of the main gases of air pollution, which has attracted widespread attention. Flue gas desulfurization is an effective method to reduce sulfur emissions. Countries around the world began to study desulfurization technology in the 1950s. So far, there are more than 200 desulfurization technologies. The main methods are wet desulfurization, semi-dry desulfurization, dry desulfurization, rotary Various desulfurization processes such as spray drying desulfurization and electron beam desulfurization. [0003] Among the flue gas desulfurization technologies currently used in industry, the wet method, especially the limestone / gypsum method, is the most common. Although this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
Inventor 武乔章林敏
Owner 江苏蓝电环保股份有限公司