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Catalytic oxidation method of desulfurizing liquid

A technology of catalytic oxidation and desulfurization liquid, which is applied in the direction of chemical instruments and methods, separation methods, physical/chemical process catalysts, etc., can solve problems such as human health hazards, high operating costs, and acid rain formation, so as to improve utilization and oxidation rate, effect of slowing deposition

Active Publication Date: 2015-02-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfur dioxide is not only harmful to human health, but also forms acid rain, causing serious pollution to the environment
In this treatment process, a complexing agent is added as an oxidation catalyst, and the operation cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation of the oxidation catalyst used in the embodiment:

[0024] 100 g TiO 2 The carrier is immersed in an aqueous solution of cerium nitrate, stirred and evaporated to dryness, dried at 110°C for 12 hours, and calcined at 600°C for 2 hours to obtain a Ce-loaded catalyst. The catalyst can be expressed as Ce / TiO 2 , the active component Ce content is 10 wt%.

[0025] Desulfurization liquid oxidation:

[0026] The concentration of sodium sulfite in the desulfurization liquid is 2400 mg / L, the COD is 485 mg / L, and the pH value is 7.2. The desulfurization liquid enters the fixed-bed reactor from the top of the reactor, and the air enters the fixed-bed reactor from the bottom of the reactor to contact the desulfurization liquid countercurrently. , on Ce / TiO 2 The reaction was carried out under the catalytic action of a catalyst (catalyst volume 100 mL). The reaction conditions are: the volume space velocity of the desulfurization liquid is 3h -1 , the reaction...

Embodiment 2

[0028] Prepare La / TiO according to the preparation method of Example 1 2 Catalyst, active component La content is 10wt% in the catalyst.

[0029] Desulfurization liquid oxidation:

[0030] The concentration of sodium sulfite in the desulfurization liquid is 2245 mg / L, the COD is 424 mg / L, and the pH value is 7.1. The desulfurization liquid enters the fixed-bed reactor from the top of the reactor, and the air enters the fixed-bed reactor from the bottom of the reactor to contact the desulfurization liquid countercurrently. , in La / TiO 2 The reaction was carried out under the catalytic action of a catalyst (catalyst volume 100 mL). The reaction conditions are: the volume space velocity of the desulfurization liquid is 5h -1 , the reaction temperature is 40°C, and the air / desulfurization liquid volume ratio is 200. After the reaction was stable for 60 minutes, samples were taken to analyze the concentration of sulfite ion and COD.

Embodiment 3

[0032] Prepare Pr / TiO according to the preparation method of Example 1 2 Catalyst, the content of active component Pr in the catalyst is 20wt%.

[0033] Desulfurization liquid oxidation:

[0034] The concentration of sodium sulfite in the desulfurization liquid is 2574 mg / L, the COD is 536 mg / L, and the pH value is 7.3. The desulfurization liquid enters the fixed-bed reactor from the top of the reactor, and the air enters the fixed-bed reactor from the bottom of the reactor to contact the desulfurization liquid countercurrently. , in Pr / TiO 2 The reaction was carried out under the catalytic action of a catalyst (catalyst volume 100 mL). The reaction conditions are: the volume space velocity of the desulfurization liquid is 1h -1 , the reaction temperature is 60°C, and the air / desulfurization liquid volume ratio is 10. After the reaction was stable for 60 minutes, samples were taken to analyze the concentration of sulfite ion and COD.

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PUM

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Abstract

The invention discloses a catalytic oxidation method of a desulfurizing liquid. According to the method, a SO2 absorbed desulfurizing liquid and air continuously pass through a fixed bed reactor filled with a catalyst and react in the presence of the catalyst and under a proper oxidation condition, wherein the catalyst is a supported catalyst; a carrier is titanium dioxide; and an active metal component is rare-earth oxide. By the adoption of the method, oxidation rate and oxygenation efficiency of sulfite are significantly raised. During the application of the catalyst, there is no loss of active components. Therefore, operation cost is reduced, and secondary pollution caused by loss of active components is also effectively avoided. In addition, the solid catalyst used also has advantages of high mechanical strength, wear resistance, long service life and the like. The method provided by the invention provides an effective processing method for the discharge of a wet flue gas desulfurizing liquid to reach the standard.

Description

technical field [0001] The invention relates to the oxidation technology of desulfurization liquid, in particular to the catalytic oxidation technology of sulfite in the desulfurization liquid after wet flue gas desulfurization and the used catalyst. Background technique [0002] When burning sulfur-containing fuels, except for a part of the sulfur contained in the soot, the other part will be emitted into the atmosphere in the form of sulfur dioxide. Sulfur dioxide is not only harmful to human health, but also forms acid rain, causing serious pollution to the environment. Therefore, large-scale combustion devices are generally equipped with flue gas desulfurization devices, most of which are wet flue gas desulfurization devices. [0003] Usually, the desulfurization liquid obtained after wet desulfurization mainly contains sulfite. In order to facilitate the utilization of sulfite and make the discharged wastewater meet the standard, it is necessary to oxidize sulfite into...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/96B01D53/50B01J23/10
Inventor 王学海刘忠生程明珠
Owner CHINA PETROLEUM & CHEM CORP
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