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[Chemical Knowledge]：Production and manufacturing method and process flow of sodium hypochlorite

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The manufacturing method
of sodium hypochlorite
1. Introduction

sodium hypochlorite is an important inorganic chemical, widely used in water treatment, bleaching, disinfection and other fields. This article will introduce the manufacturing method of sodium hypochlorite, including raw material selection, reaction principle, production process and equipment.

2. Raw Material Selection

The manufacture of sodium hypochlorite mainly uses sodium chloride and alkaline absorbent as raw materials. Among them, sodium chloride is a common chemical raw material, which has a wide range of sources and low price. Alkaline absorbent can be selected from sodium hydroxide or calcium hydroxide, etc.

3. reaction principle

The manufacture of sodium hypochlorite is obtained by reacting chlorine generated by electrolyzing sodium chloride solution with an alkaline absorbent. The specific reaction equation is as follows:
chlorine and sodium hydroxide are produced
electrolysis of sodium chloride solution: NaCl H2O → NaOH Cl2 ↑

chlorine reacts with alkaline absorbent to produce sodium hypochlorite: Cl2 2NaOH → NaCl NaClO H2O

4. production process

sodium hypochlorite production process mainly includes the following steps:

1. Ingredients: Add sodium chloride and appropriate amount of water into the ingredient tank and stir evenly.

2. electrolysis: the sodium chloride solution in the batching tank is pumped into the electrolytic cell, and the direct current is used for electrolysis to produce chlorine and sodium hydroxide.

3. Absorption: The chlorine gas generated by electrolysis is passed into an alkaline absorbent to react to generate sodium hypochlorite.

4. Crystallization: The sodium hypochlorite solution after the reaction was crystallized to obtain sodium hypochlorite as a solid.

5. Drying: The sodium hypochlorite solid was dried to obtain the final sodium hypochlorite product.

5. Equipment Selection

The production of sodium hypochlorite requires the use of electrolytic cells, batching tanks, crystallization tanks, dryers and other equipment. Among them, the electrolytic cell is the key equipment, and it is necessary to select the appropriate model and specification according to the production scale and production process.
Precautions for operation of
6.

In the production process of sodium hypochlorite, the following operation items need to be paid attention to:

1. Strictly control the temperature and current of the electrolyzer to avoid excessive heat and hydrogen generation, which will affect product quality And production safety.

2. Clean the electrolytic cell and the batching tank regularly to avoid the influence of scale and impurities on the production.

3. Pay attention to the selection and ratio of alkaline absorbent to ensure reaction efficiency and product quality.

4. Strengthen the ventilation and protective measures on the production site to avoid the harm of chlorine and alkaline absorbent to operators.

7. Conclusion The manufacturing method of

sodium hypochlorite mainly includes raw material selection, reaction principle, production process and equipment selection. In the actual production process, it is necessary to strictly control the operating conditions and equipment operating conditions to ensure product quality and production safety. At the same time, it is also necessary to strengthen the environmental protection and protection measures on the production site to reduce the harm to the environment and operators.

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