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Electrochemical desulphurization method and application of intermediate product

An electrochemical, sulfur dioxide technology, applied in chemical instruments and methods, applications, inorganic chemistry, etc., can solve problems such as secondary pollution

Inactive Publication Date: 2014-03-19
常州和方环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, these two methods will produce a large amount of solid waste of calcium sulfite and calcium sulfate during the desulfurization process, which will cause secondary pollution

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  • Electrochemical desulphurization method and application of intermediate product

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Embodiment 1

[0028] Such as figure 1 Shown is the process flow diagram of the electrochemical desulfurization method of the present invention, and the method steps of the present invention are as follows:

[0029] 1. Prepare a saturated solution of sodium iodide;

[0030] 2. Feed the saturated solution of sodium iodide into the electrolytic cell, perform electrolysis under the effect of a direct current electric field, and prepare by electrolysis a sodium hydroxide alkaline solution containing 10% elemental iodine, i.e. an absorption solution;

[0031] 3. Spray the absorption solution after electrolysis into the sulfur dioxide absorption tower, control the molar ratio of sodium hydroxide in the absorption solution to sulfur dioxide in the absorption tower to 1:1, the sulfur dioxide in the absorption tower is absorbed and oxidized to form a sodium sulfate solution ;

[0032] 4. Control the pH value of the absorption solution after absorption to be 6.5, pass the absorption solution after t...

Embodiment 2

[0035] 1. Prepare a saturated solution of potassium bromide;

[0036] 2. Pass potassium bromide saturated solution in the electrolyzer, carry out electrolysis under the effect of DC electric field, electrolysis is prepared into the potassium hydroxide alkaline solution containing 5% elemental bromine, i.e. absorption solution;

[0037] 3. Spray the electrolyzed absorption solution into the sulfur dioxide absorption tower, control the molar ratio of potassium hydroxide in the absorption solution to sulfur dioxide in the absorption tower to 1:1.1, and the sulfur dioxide in the absorption tower is absorbed and oxidized to form potassium sulfate solution ;

[0038] 4. Control the pH value of the absorption solution after absorption to be 6.8, pass the absorption solution after the absorption into the sedimentation tank, separate the solid dust therein, and pass the supernatant liquid generated into the vacuum dryer, and the potassium sulfate crystallization in the absorption solut...

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Abstract

The invention discloses an electrochemical desulphurization method. The method comprises the following steps: (1) preparing a saturated solution of sodium salt or kali salt of halogen elements; (2) electrolyzing the saturated solution so as to produce an absorbent solution; (3) spraying the absorbent solution into a sulfur dioxide absorption tower so as to be fully contacted with gas containing sulfur dioxide; (4) recycling the absorbent solution. According to the method, the solution of kali salt or sodium salt of the halogen elements is electrolyzed so as to produce the absorbent solution for absorbing sulfur dioxide gas; as the absorbent solution is alkaline, the absorptivity of sulfur dioxide reaches more than 97%, furthermore, the absorbed sulfite is rapidly oxidized into sulfate by chlorine, bromine or iodine in the solution, no solid waste is generated in the whole desulphurization process, and the intermediate product sodium sulphide or potassium sulphide can be widely applied to industrial production or agricultural production.

Description

technical field [0001] The invention relates to a process for removing sulfur dioxide, in particular to an electrochemical desulfurization method and the application of intermediate products thereof. Background technique [0002] SO 2 It is a pollutant that seriously endangers the atmospheric environment, SO 2 It reacts with water vapor to form sulfuric acid, which falls to the ground with rainwater as acid rain. When coal is heated to 400°C, it first decomposes into H 2 S, then gradually oxidized to SO 2 . [0003] Limestone wet flue gas desulfurization and fluidized bed desulfurization are currently widely used methods. Limestone wet flue gas desulfurization technology, air is blown into the slurry in the absorption tower to force CaSO 3 are oxidized to CaSO 4 (Gypsum), the by-product of desulfurization is gypsum, while blowing air to produce a more uniform slurry, easy to achieve 90% desulfurization rate, and easy to control scaling and blockage. Since limestone i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/96B01D53/50C01D5/00C01B33/32C03C1/00C05D1/02D21C3/02
Inventor 居明张念忠宋蕴丽
Owner 常州和方环保科技有限公司
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