Method for decomposing sodium hypochlorite

A technology of sodium hypochlorite and sodium hypochlorite solution, applied in the direction of alkali metal chloride, etc., can solve the problems of accelerated decomposition speed, difficulty in transportation, storage and use, easy decomposition, etc., and achieve the effects of accelerating decomposition, realizing reuse, and reducing costs.

Inactive Publication Date: 2014-10-08
GUIZHOU DALONG MERCURY SILVER STAR IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of this sodium hypochlorite solution are as follows: (1) Poor stability and easy decomposition: sodium hypochlorite solution is very easy to decompose when exposed to light and heat: the decomposition speed is obviously accelerated when the temperature is higher than 30 ° C. If it is exposed to sunlight for about 20 hours, then 90 % of available chlorine is decomposed; even sodium hypochlorite at room temperature is unstable, has strong oxidation and volatility, and brings many difficulties to transportation, storage, use, etc.; (2) low content of available chlorine: due to the use of residual The sodium hypochlorite solution produced by chlorine and dilute sodium hydroxide solution has an effective

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A kind of decomposition method of sodium hypochlorite, comprises the steps:

[0016] (1) The tail gas containing chlorine and mercuric chloride vapor from the mercuric chloride synthesis process is mixed with a sodium hydroxide solution with a weight concentration of 5% for gas-liquid mixing and absorption reaction to generate a sodium hypochlorite solution, and the mercuric chloride vapor is cooled and dissolved In the sodium hypochlorite solution, air escapes from the surface of the solution. When the pH value of the solution is 10.5, add nickel chloride and stir to mix evenly. Add 25kg of nickel chloride to 1 ton of sodium hypochlorite solution. When the pH value is 7, the decomposition is complete;

[0017] (2) Separate the nickel oxyhydroxide in the solution, and the nickel oxyhydroxide is returned to decompose the sodium hypochlorite solution. When the weight concentration of sodium chloride in the solution reaches 10%, add hydrochloric acid to the solution to adju...

Embodiment 2

[0021] A kind of decomposition method of sodium hypochlorite, comprises the steps:

[0022] (1) The tail gas containing chlorine and mercuric chloride vapor from the synthesis process of mercuric chloride is mixed with 8% sodium hydroxide solution for gas and liquid absorption reaction to generate sodium hypochlorite solution, and the mercuric chloride vapor is cooled and dissolved In the sodium hypochlorite solution, the air escapes from the surface of the solution. When the pH value of the solution is 111, add nickel chloride (or nickel oxide, nickel hydroxide) and stir to mix evenly. Add 25kg of nickel chloride (or nickel oxide) to 1.5t sodium hypochlorite solution. , nickel hydroxide), when the pH value is 8, the decomposition is complete;

[0023] (2) Separate the nickel oxyhydroxide in the solution, and the nickel oxyhydroxide is returned to decompose the sodium hypochlorite solution. When the weight concentration of sodium chloride in the solution reaches 15%, add hydro...

Embodiment 3

[0027] A kind of decomposition method of sodium hypochlorite, comprises the steps:

[0028] (1) The tail gas containing chlorine and mercuric chloride vapor from the mercuric chloride synthesis process is mixed with 10% sodium hydroxide solution for gas-liquid absorption reaction to generate sodium hypochlorite solution, and the mercuric chloride vapor is cooled and dissolved In the sodium hypochlorite solution, the air escapes from the surface of the solution. When the pH value of the solution is 11, add nickel oxide and stir to mix evenly. Add 25kg of nickel oxide to the 1-1.5t sodium hypochlorite solution. When the pH value is 7-8, it will decompose Finish;

[0029] (2) Separate the nickel oxyhydroxide in the solution, and the nickel oxyhydroxide is returned to decompose the sodium hypochlorite solution. When the weight concentration of sodium chloride in the solution reaches 12%, add hydrochloric acid to the solution to adjust the pH value to 6 to completely decompose the ...

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PUM

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Abstract

The invention discloses a method for decomposing sodium hypochlorite. The method comprises the following steps: carrying out gas and liquid mixing and absorbing reaction on exhaust gas which contains chlorine and mercuric chloride vapor and comes from a mercuric chloride synthesis working procedure by using a sodium hydroxide solution with the weight concentration of 5-10%, so as to produce a sodium hypochlorite solution, cooling and dissolving the mercuric chloride vapor into the sodium hypochlorite solution, enabling air to escape from the surface of the solution, when the pH value of the solution is 10.5-11, adding nickel chloride (or nickel oxide or nickel hydroxide) according to the ratio that 25kg of nickel chloride (or nickel oxide or nickel hydroxide) is added into every 1-1.5t of sodium hypochlorite solution, stirring and mixing uniformly, and completing decomposition when the pH value is 7-8; separating nickel oxyhydroxide from the solution, thereby obtaining a sodium chloride solution. The method has the advantages that the decomposition of the sodium hypochlorite solution can be accelerated, the recycling of materials can be realized, and the method is safe and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for decomposing sodium hypochlorite. [0002] Background technique [0003] At present, the fire-method mercuric chloride synthesis process is to pass chlorine gas into a quartz glass retort filled with high-temperature mercury liquid, and the chlorine gas and mercury vapor undergo a combustion reaction to generate mercuric chloride vapor, and the generated mercuric chloride vapor is inhaled by negative pressure for cooling. Inside the tower, rise and cool along the tower; when the temperature drops below the boiling point of mercuric chloride (302°C), mercury chloride vapor begins to crystallize and fall to the bottom of the tower; regularly take out the mercuric chloride at the bottom of the tower, pack it The finished mercuric chloride crystals are obtained. The chlorine-containing tail gas enters the absorption reactor; usually, in order to prevent mercur...

Claims

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Application Information

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IPC IPC(8): C01D3/04
Inventor 罗跃辉
Owner GUIZHOU DALONG MERCURY SILVER STAR IND
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