A recovery and treatment process of sodium chloride electrolysis industrial tail gas

A technology of electrolysis industry and tail gas recovery, applied in the direction of alkali metal chlorides, chemical instruments and methods, and separation of dispersed particles, can solve problems such as the unavoidable natural decomposition of sodium hypochlorite, secondary pollution, etc., and achieve harmless decomposition, Efficiently absorb and realize the effect of intelligent automatic control

Active Publication Date: 2018-08-31
浙江钛合工程技术有限公司
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Problems solved by technology

Although this recovery process can realize the full recycling of sodium hypochlorite waste liquid, it is difficult to avoid the natural decomposition of sodium hypochlorite in the process of treatment. The chlorine gas released by natural decomposition will cause secondary pollution, and it is difficult to effectively apply it to actual production.
[0005] To sum up, there is no simple, green and environmentally friendly sodium chloride electrolysis industrial tail gas recovery and treatment process that can realize the recycling of sodium chloride solution.

Method used

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  • A recovery and treatment process of sodium chloride electrolysis industrial tail gas

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Embodiment 1

[0029] see figure 1 , adopting capacity is the tank of 20 cubic meters as alkali distribution tank 2, prepares lye as absorption liquid; Dynamic wave absorption device 31 is installed on the side of absorption tower 3, and is connected with lye output pump 21 and circulation pump 32, and 1# mass flow meter 33 and 2# mass flow meter 34 are respectively installed at the liquid inlet and outlet of absorption tower; #Mass flow meter 43, heating device 42 is installed inside; Selecting capacity is the tank of 10 cubic meters as regulating tank 5, and measuring equipment 52 is set inside it, feeding pipe 53 is set at its top and feeds by feeding pump 51 control feeding; Filter The device 6 receives the solution from the regulating tank 5. After the filtration is completed, the filtrate is tested by the online particle detector 61 and then transported to the NaCl electrolytic tank 1 of the NaCl electrolysis process. All testing equipment (including 1# mass flowmeter 33, 2# mass flow...

Embodiment 2

[0032] see figure 1 The steps of the sodium chloride electrolysis industrial tail gas recovery and treatment process in the present embodiment are as follows: the sodium chloride electrolysis industrial tail gas is transported to the dynamic wave absorption device 31 through the pipeline, and the sodium hydroxide solution is transported to the dynamic wave absorption device 31 through the pipeline , under the action of the dynamic wave absorbing device 31, the sodium hydroxide solution is sprayed into foam and fully contacted with the tail gas of the sodium chloride electrolysis industry, so that the chlorine in the tail gas of the sodium chloride electrolysis industry is fully absorbed by the foamy sodium hydroxide solution. Absorb to form the absorption liquid containing sodium hypochlorite, then the absorption liquid enters the absorption tower 3, and detects the concentration of the salt sodium hypochlorite in the absorption liquid in the absorption tower 3 in real time, wh...

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Abstract

The invention relates to a process for recovery of sodium chloride electrolysis industrial exhaust. There is no process for recycling of sodium chloride solution at present. The process for recovery of sodium chloride electrolysis industrial exhaust comprises the steps that sodium hydroxide solution is made into foam by means of a dynamic wave absorption device and makes full contact with sodium chloride electrolysis industrial exhaust to form absorption liquid containing sodium hypochlorite, the absorption liquid enters an absorption tower to absorb sodium chloride electrolysis industrial exhaust in a circulating mode till a set value is obtained when the concentration of sodium hypochlorite in the absorption liquid is smaller than the set value, the absorption liquid is then delivered to a decomposition tower, a catalyst is formed by mixing of copper oxide and manganese dioxide and decomposes sodium hypochlorite in the absorption liquid into oxygen and sodium chloride, and after the absorption liquid enters a regulating tank, Na2SO3 used as a reducing agent, sodium hydroxide used as a pH regulator and BaCl2 used as a precipitator are added in sequence for filtration, so that sodium chloride solution meeting the requirement of the sodium chloride electrolysis process is obtained. Recycling of sodium chloride solution can be achieved through the process.

Description

technical field [0001] The invention relates to a method for harmless treatment of toxic and harmful waste gas, in particular to a recovery and treatment process for sodium chloride electrolysis industrial tail gas. Background technique [0002] In the chlor-alkali industry, especially the sodium chloride electrolysis process, a toxic and harmful chlorine gas will be produced, especially in the process of equipment maintenance, it is inevitable that chlorine gas will overflow with the tail gas. If these toxic chlorine gases are not treated and discharged directly into the atmosphere, it will directly threaten human health and cause great harm to the environment. [0003] At present, the method of lye absorption is mainly used to treat the industrial tail gas of sodium chloride electrolysis. However, in the process of tail gas absorption, it is difficult to ensure the complete absorption of chlorine gas only through simple manual control, and the sodium hypochlorite generated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/68B01D53/73C01D3/04
CPCB01D53/68B01D53/73B01D53/78B01D2251/304C01D3/04
Inventor 潘勇肖鸽顾辉子黄建国胡灯红
Owner 浙江钛合工程技术有限公司
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