Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for recovering sulfur dioxide in flue gas

A sulfur dioxide and carbon monoxide technology, applied in the direction of sulfur preparation/purification, etc., can solve the problems of long process flow, toxicity, and difficulty in industrial application, and achieve the effects of high economic value, simple process, and simple raw materials

Active Publication Date: 2019-08-27
CHENGDU GUOHUA ENVIRONMENTAL TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN103316578A discloses a method of absorbing sulfur dioxide by using calcium-based absorbent and preparing sulfur by carbon reduction. This method consumes a lot of energy, and the temperature required in the carbon roasting stage is between 800-1000°C, which is difficult for industrial application; and The solvent used (carbon disulfide) is highly toxic and poses a potential threat to the health of the operator
Chinese patent ZL200710035059.4 proposes a method of absorbing SO using sodium sulfide 2 The method for producing sulfur has a long process flow, requires high temperature and high pressure equipment, high cost, and there is H in the absorption process. 2 S produced, causing environmental pollution
Chinese patent CN102049257A discloses that CO can be directly reduced to SO at 320-350°C by using a catalyst 2 , but poisonous COS will be produced during the reaction, and the prepared sulfur will adhere to the surface of the catalyst, poisoning the catalyst

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Carbon monoxide simulates flue gas as CO and N 2 The fully mixed gas, the volume fraction of CO is 5%. Sulfur dioxide simulated flue gas as SO 2 and N 2 A well-mixed gas, SO 3 The volume fraction is 3%. Add 40ml of N,N-dimethylformamide, 8ml of deionized water, and 0.05g of Se-La-Ce / Al into a three-necked flask 2 o 3 , into a 90°C water bath. Bubble the above carbon monoxide-containing flue gas into the solution through a bubbling device at a flow rate of 0.4 L / min at 25°C. After about 15 minutes of reaction, pass it in at a rate equivalent to about 80% of the CO simulated flue gas flux. SO 2 To simulate flue gas, control the amount of carbon monoxide to be 1.8 times the amount of sulfur dioxide. On-line measurement of the pH value of the absorption liquid, the exhaust gas is condensed and refluxed and then introduced into the flue gas analyzer to analyze CO, CO 2 , SO 2 concentration. After the above-mentioned carbon monoxide and sulfur dioxide flue gas are ...

Embodiment 2

[0028] Carbon monoxide simulates flue gas as CO and N 2 The fully mixed gas, the volume fraction of CO is 8%. Sulfur dioxide simulated flue gas as SO 2 and N 2 A well-mixed gas, SO 3 The volume fraction is 5%. Add 60m1N,N-dimethylformamide, 8m1 deionized water, 0.05g Se-La-Ce / Al into a three-necked flask 2 o 3 , into a 90°C water bath. Bubble the above carbon monoxide-containing flue gas into the solution through a bubbling device at a flow rate of 0.4 L / min at 25°C. After about 15 minutes of reaction, pass it in at a rate equivalent to about 85% of the CO simulated flue gas flux. SO 2 To simulate flue gas, control the amount of carbon monoxide to be 1.9 times the amount of sulfur dioxide. On-line measurement of the pH value of the absorption liquid, the exhaust gas is condensed and refluxed and then introduced into the flue gas analyzer to analyze CO, CO 2 , SO 2 concentration. After the above-mentioned carbon monoxide and sulfur dioxide flue gas are absorbed, the ...

Embodiment 3

[0031] Carbon monoxide simulates flue gas as CO and N 2 The fully mixed gas, the volume fraction of CO is 7%. Sulfur dioxide simulated flue gas as SO 2 and N 2 A well-mixed gas, SO 3 The volume fraction is 4%. Add 50m1N,N-dimethylformamide, 8m1 deionized water, 0.05g Se-La-Ce / Al into a three-necked flask 2 o 3 , into a 90°C water bath. Bubble the above carbon monoxide-containing flue gas into the solution through a bubbling device at a flow rate of 0.4 L / min at 25°C. After about 15 minutes of reaction, pass it in at a rate equivalent to about 80% of the CO simulated flue gas flux. SO2 simulates flue gas, and the amount of carbon monoxide is controlled to be 1.85 times the amount of sulfur dioxide. On-line measurement of the pH value of the absorption liquid, the exhaust gas is condensed and refluxed and then introduced into the flue gas analyzer to analyze CO, CO 2 , SO 2 concentration. After the above-mentioned carbon monoxide and sulfur dioxide flue gas are absorbe...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for recovering sulfur dioxide from exhaust gas. After an organic solvent containing a catalyst Se-La-Ce / Al2O3 is utilized to absorb sulfur dioxide exhaust gas and carbon monoxide gas for a period of time, filtering and catalyst separation are performed, the organic solvent is recovered from a filtrate, and sulfur is separated out of the filtrate. The liquid phase catalysis reduction method for treating sulfur dioxide is disclosed for the first time, waste is treated by waste, the technological process is short, raw materials are simple, Se-La-Ce / Al2O3 is takenas the catalyst, activity is high, desulfurization rate is higher than 97%, the price is low, and the recovery rate is high; the technological operating temperature is lower than the melting point ofsulfur, granular sulfur is produced, and purity is higher. The sulfur product is easy to store and has high economic value; besides, the technology is simple, clean and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of resource recovery and utilization. More specifically, the present invention relates to a method for recovering sulfur dioxide in flue gas. Background technique [0002] Low-concentration sulfur dioxide comes from steel, electric power, non-ferrous metals, petrochemicals, chemicals, building materials and other industries. It has the characteristics of wide distribution, low concentration, and difficult treatment. It is easy to form acid rain and secondary particle pollutants, which seriously endangers the ecological environment. The concentration of sulfur dioxide in low-concentration sulfur dioxide flue gas cannot meet the requirements of conventional sulfuric acid production processes, so terminal treatment methods are often used for treatment. [0003] my country's sulfur resources are relatively short, and the supply of sulfur has been in short supply for a long time. This makes my country the world...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/04C01B17/05
Inventor 李宁王维江王怀金
Owner CHENGDU GUOHUA ENVIRONMENTAL TECH