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

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The manufacturing method
of sodium metabisulfite
1. Introduction

sodium metabisulfite is an important chemical production raw material, widely used in food, medicine, printing and dyeing, papermaking and other fields. Therefore, it is of great significance to study the manufacturing method of sodium metabisulfite for improving product quality, reducing production costs and promoting industrial development. This article will introduce the manufacturing method of sodium metabisulfite in detail, including raw material preparation, reaction process, post-treatment and other processes.

2. Raw Material Preparation

The main raw materials for the manufacture of sodium metabisulfite include sodium hydroxide, sulfur and soda ash. In order to ensure the quality and purity of the product, it is necessary to choose high-quality raw materials and ensure that the ratio of raw materials is reasonable.

3. reaction process

1. alkali absorption method: sodium hydroxide solution and sulfur reaction at a certain temperature, generating a mixture of sodium sulfite and sodium hydrosulfide. The temperature and pH value need to be controlled during the reaction to ensure the smooth progress of the reaction.
2. Acidification crystallization method: the above mixture is reacted with dilute sulfuric acid to generate sodium metabisulfite crystals. In this process, it is necessary to control the acid addition rate and the crystal growth conditions to obtain a product with uniform particle size and high purity.

4. Post-treatment

1. Centrifugation: The solution after crystallization was centrifuged to obtain sodium metabisulfite solid and mother liquor.
2. Washing and drying: The sodium metabisulfite solid was washed with purified water to remove surface impurities, and then dried to obtain the final sodium metabisulfite product.

5. precautions

1. In the entire manufacturing process, it is necessary to strictly control the temperature, pH value, material ratio and other parameters of each process to ensure the quality and purity of the product.
2. It is necessary to carry out regular maintenance and maintenance of production equipment to ensure the normal operation of equipment and improve production efficiency.
3. In the production process, it is necessary to strengthen safety management and environmental protection awareness, comply with relevant laws and regulations, and ensure the safety and environmental protection of the production process.

6. Conclusion The manufacturing method of

sodium metabisulfite includes raw material preparation, reaction process and post-treatment process, and the parameters and conditions of each process need to be strictly controlled to obtain high-quality products. In the production process, it is necessary to strengthen safety management and environmental awareness, abide by relevant laws and regulations, and ensure the safety and environmental protection of the production process. Through the introduction of this paper, we hope to have a deeper understanding of the manufacturing method of sodium metabisulfite, and provide some reference for the production and research in related fields.

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