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A kind of method for preparing sodium hypochlorite

A sodium hypochlorite and chlorine gas technology, applied in hypochlorous acid, hypochlorite, chemical instruments and methods, etc., can solve the problems of increasing production costs and tail gas treatment costs, reducing effective chlorine content, increasing sodium hypochlorite, etc., to reduce tail gas Disposal cost, strong anti-oxidation ability, effect of inhibiting decomposition

Active Publication Date: 2019-01-29
ZHEJIANG OCEANKING DEVELOPMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process only increases the output of sodium hypochlorite from the improvement of production speed, and in the production process of sodium hypochlorite, sodium hypochlorite is easily decomposed to generate sodium chloride and oxygen, resulting in a decrease in available chlorine content
In order to ensure that the available chlorine content of the product meets the standard, the input of raw materials will be increased, thereby increasing the production cost and the cost of tail gas treatment, which needs to be improved

Method used

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  • A kind of method for preparing sodium hypochlorite
  • A kind of method for preparing sodium hypochlorite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step1: According to parts by weight, weigh 3 parts of silicon nitride, 4 parts of sodium silicate and 1000 parts of sodium chloride;

[0036] Step2: Put the weighed silicon nitride, sodium silicate and sodium chloride in a double-helix mixer, mix them evenly, and press them into shape;

[0037] Step3: Under nitrogen protection, control the temperature at 650°C for sintering;

[0038] Step4: Grind after cooling and forming, and pass through a 200-mesh sieve to obtain the product.

Embodiment 2

[0040] Step1: According to parts by weight, weigh 4 parts of silicon nitride, 2 parts of sodium silicate and 1500 parts of sodium chloride;

[0041] Step2: Put the weighed silicon nitride, sodium silicate and sodium chloride in a double-helix mixer, mix them evenly, and press them into shape;

[0042] Step3: Under nitrogen protection, control the temperature at 675°C for sintering;

[0043] Step4: Grind after cooling and forming, and pass through a 200-mesh sieve to obtain the product.

Embodiment 3

[0045] Step1: According to parts by weight, weigh 6 parts of silicon nitride, 3 parts of sodium silicate and 2000 parts of sodium chloride;

[0046] Step2: Put the weighed silicon nitride, sodium silicate and sodium chloride in a double-helix mixer, mix them evenly, and press them into shape;

[0047] Step3: Under nitrogen protection, control the temperature at 700°C for sintering;

[0048] Step4: Grind after cooling and forming, and pass through a 200-mesh sieve to obtain the product.

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PUM

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Abstract

The invention discloses a method for preparing sodium hypochlorite. The method comprises the following steps that step 1, water is added to a sodium hydroxide solution for dilution, a stabilizing agent is added, and the mixture is stirred uniformly; step 2, the diluted sodium hydroxide solution and the stabilizing agent enter a first cooler for cooling and then pass through a falling-film absorption tower, cooled chlorine is fed for reaction, and a reaction endpoint is monitored; step 3, the mixture is cooled by a second cooler, the cooled product is fed to a packing absorption tower, cooled chlorine is fed for reaction, and a reaction endpoint is monitored; step 4, the mixture is cooled by a third cooler and then is fed to a finished product storage tank; the stabilizing agent comprises silicon nitride, sodium silicate and sodium chloride, the adding amount of the silicon nitride is 3-6 mg / L, the adding amount of the sodium silicate is 1-5 mg / L, and the adding amount of the sodium chloride is 1-3.5 mg / L. The method for preparing the sodium hypochlorite has the advantages that the raw material input is reduced by improving the stability of the sodium hypochlorite, the production cost and the tail gas treatment cost are reduced, the economic growth pursuing requirement is met, and the environment protection and green concept is met.

Description

technical field [0001] The invention relates to the field of chlor-alkali industry, in particular to a method for preparing sodium hypochlorite. Background technique [0002] Sodium hypochlorite is a high-efficiency oxidant and chlorine-containing disinfectant. It is used as a bleaching agent, oxidizing agent and water purifier for papermaking, textile, light industry, etc. It has the functions of bleaching, sterilization and disinfection. It has strong oxidation ability, fast action and good effect, and its functions are very extensive. The preparation methods of sodium hypochlorite in the prior art mainly include brine electrolysis, chlorine gas and sodium hydroxide contact reaction. [0003] The Chinese patent with publication number 105197892A discloses a new production process of sodium hypochlorite, which can increase the output of sodium hypochlorite, reduce the intensity of workers' operation, realize stable real-time monitoring, and improve monitoring accuracy. Bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B11/06
CPCC01B11/062
Inventor 孙毅王世周封勇波徐松涛
Owner ZHEJIANG OCEANKING DEVELOPMENT CO LTD
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