Process method for absorbing sulfur dioxide in flue gas by using aqueous carboxylate solution and regenerating absorbent at same temperature

A technology of sulfur dioxide and process methods, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of increasing greenhouse gas carbon dioxide emissions, failing to realize the utilization of sulfur resources, and high cost of ionic liquids, so as to avoid regeneration energy consumption High, avoid equipment corrosion, low price effect

Inactive Publication Date: 2017-10-27
TAIYUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this technology: (1) Since a large amount of low-grade gypsum is produced after desulfurization, it is difficult to use and becomes a de facto secondary pollutant, which restricts the application of this method to a certain extent; (2) every ton of sulfur dioxide treated , will emit 0.7 tons of carbon dioxide. Although the sulfur dioxide pollution in the flue gas is controlled, the emission of greenhouse gas carbon dioxide is increased; (3) the resource utilization of sulfur has not been realized
The main problems of ionic liquid absorption of sulfur dioxide in flue gas are: high cost of ionic liquid, poor stability of long-term use and high regeneration energy consumption, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take by weighing 10.0g mass concentration and be that the sodium lactate aqueous solution of 51wt% is placed in test tube (1# test tube), this test tube is placed in the water bath of temperature 25 ℃ (that is, absorption temperature is 25 ℃); Take by weighing 10.0g water and place in another In a test tube (2# test tube), the test tube is also placed in a water bath with a temperature of 25°C; the simulated flue gas (mixed gas of nitrogen and sulfur dioxide) with a sulfur dioxide concentration of 1970ppm (volume fraction) is first bubbled through 2# The water in the test tube is then bubbled through the absorbent in the 1# test tube to absorb sulfur dioxide. The flow rate of the simulated flue gas is 100mL / min. The reason for using 2 test tubes is that the simulated flue gas first bubbles through the water in the 2# test tube and absorbs water to reach saturation; in this way, when the sulfur dioxide is absorbed through the 1# test tube, the water content remains unchan...

Embodiment 2

[0027]Take by weighing 10.0g mass concentration and be that the sodium lactate aqueous solution of 51wt% is placed in test tube (1# test tube), this test tube is placed in the water bath of temperature 30 ℃ (that is, absorption temperature is 30 ℃); Take 10.0g water and place in another In a test tube (2# test tube), the test tube is also placed in a water bath with a temperature of 30°C; the simulated flue gas (mixed gas of nitrogen and sulfur dioxide) with a sulfur dioxide concentration of 1970ppm (volume fraction) is first bubbled through 2# The water in the test tube is bubbled through the absorbent of 1# test tube, and the flow rate of simulated flue gas is 100mL / min to absorb sulfur dioxide. After the absorption is saturated, adopt the iodometric method to measure the content of sulfur dioxide in the absorption liquid (see Example 1 for the measurement method); the measurement result shows that the absorption of sulfur dioxide in the absorbent is 0.0551g / g absorbent.

[...

Embodiment 3

[0030] Take by weighing 10.0g mass concentration and be that the sodium lactate aqueous solution of 51wt% is placed in test tube (1# test tube), this test tube is placed in the water bath of temperature 40 ℃ (that is, absorption temperature is 40 ℃); Take 10.0g water and place in another In a test tube (2# test tube), the test tube is also placed in a water bath with a temperature of 40°C; the simulated flue gas (mixed gas of nitrogen and sulfur dioxide) with a sulfur dioxide concentration of 1970ppm (volume fraction) is first bubbled through 2# The water in the test tube is bubbled through the absorbent of 1# test tube, and the flow rate of simulated flue gas is 100mL / min to absorb sulfur dioxide. After the absorption is saturated, adopt the iodometric method to measure the content of sulfur dioxide in the absorption liquid (see Example 1 for the measurement method); the measurement result shows that the absorption of sulfur dioxide in the absorbent is 0.0446g / g absorbent.

...

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Abstract

The invention discloses a process method for absorbing sulfur dioxide in flue gas by using an aqueous carboxylate solution and regenerating an absorbent at the same temperature. The process method comprises the following steps: with the aqueous carboxylate solution as the absorbent, under the conditions that the absorbing temperature is 25-60 DEG C and the concentration of the sulfur dioxide in the flue gas is 100-10000ppm, absorbing the sulfur dioxide gas in the flue gas, and then at the temperature equal to the absorbing temperature, under the stirring condition, inflating hydrogen sulfide, reacting with the sulfur dioxide in the absorbent to produce sulfur, recycling the sulfur through filtration or centrifugation to regenerate the absorbent, and reusing the regenerated absorbent. The process method has the advantages as follows: the absorbent is low in cost, pollution-free, good in stability and low in regeneration energy consumption; resource utilization of the sulfur dioxide is achieved.

Description

technical field [0001] The invention relates to a technical method for absorbing sulfur dioxide in flue gas with carboxylate aqueous solution and regenerating the absorbent at the same temperature. technical background [0002] Sulfur dioxide (SO 2 ) is one of the more harmful pollutants in the air pollutants, mainly from the combustion of coal. my country is a big coal-producing and coal-consuming country. Coal accounts for about 70% of primary energy consumption, most of which are used for direct combustion. Since coal contains about 1% sulfur, a large amount of sulfur dioxide is produced during the combustion process, and if the combustion flue gas is discharged directly, it will cause serious environmental problems. On the other hand, sulfur dioxide is a chemical raw material for the production of sulfur and sulfuric acid. my country is relatively short of sulfur resources. Every year, my country needs to import a large amount of sulfur and sulfuric acid for the produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCB01D53/1425B01D53/1481B01D53/1493B01D2252/205B01D2258/0283
Inventor 侯玉翠
Owner TAIYUAN NORMAL UNIV
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