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[Chemical Knowledge]：Production and manufacturing method and process of bleaching powder

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The manufacturing method
of bleaching powder
1. Introduction

bleaching powder is a widely used chemical product, especially in pulp and fabric bleaching, drinking water disinfection, swimming pool treatment and other fields have important applications. Its main component is calcium hypochlorite, which has strong oxidation and can effectively remove color and sterilization. This article will introduce the manufacturing method of bleaching powder in detail, including raw material preparation, chemical reaction, product post-treatment and other processes.

2. raw material preparation

manufacturing bleaching powder main raw materials for lime and chlorine. Limestone is calcined to obtain quicklime, and then reacts with water to obtain hydrated lime. Chlorine gas is obtained by electrolysis of salt water. In order to ensure product quality, it is necessary to control the purity and particle size distribution of raw materials. The production of

3. chemical reaction

bleaching powder is mainly realized by the reaction of chlorine gas and hydrated lime. The reaction is carried out in an alkaline absorption tower. Chlorine gas is introduced into the tower to contact with hydrated lime slurry from top to bottom, and the following chemical reactions occur:
calcium hypochlorite generated by
2Cl2 2Ca(OH)2 → CaCl2 Ca(ClO)2 2 H2O

reaction is the effective component of bleaching powder, while calcium chloride generated is a by-product. The pH value, temperature and chlorine flow rate need to be controlled during the reaction to ensure the stability of the reaction and product quality.

4. product post-treatment
After the end of the
reaction, the product needs to be post-treated. First, the solid bleach powder and the mother liquor are separated by filtration, centrifugation and the like. The bleach powder is then washed, dried and packaged to give the final bleach powder product. The mother liquor contains unreacted raw materials and by-products, which can be further processed and used.
Safety and environmental protection
in the production process of
5.
In the production process of bleaching powder, it is necessary to pay attention to safety and environmental protection issues. Chlorine gas is a toxic gas, and its leakage and discharge need to be strictly controlled. At the same time, the waste water and waste gas generated in the production process also need to be properly treated to avoid the impact on the environment and human health.

6. Conclusion The manufacturing method of

bleaching powder mainly includes raw material preparation, chemical reaction and product post-treatment. By controlling the purity of raw materials and reaction conditions, the bleaching powder product with stable quality can be obtained. At the same time, it is necessary to pay attention to safety and environmental protection issues in the production process to ensure the smooth progress of the production process and minimize the impact on the environment.

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