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

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The manufacturing method
of sodium salicylate
1. Introduction

Sodium salicylate is an important organic chemical raw material, widely used in medicine, dyes, spices, pesticides and other fields. This article will introduce the manufacturing method of sodium salicylate, including raw material preparation, reaction process, post-treatment and product quality control.

2. raw material preparation

1. Salicylic acid: Salicylic acid is the main raw material for the production of sodium salicylate, and industrial grade salicylic acid with high purity and stable quality should be selected.
2. sodium hydroxide: select high purity industrial grade sodium hydroxide.
3. Solvent: Water or ethanol can be selected as the reaction solvent.

3. reaction process

1. Dissolve: add salicylic acid to the reaction kettle, add an appropriate amount of solvent, stir and heat until dissolved.
2. Alkalization: sodium hydroxide dissolved in the right amount of solvent, slowly added to the reaction kettle, while maintaining stirring and heating, so that salicylic acid and sodium hydroxide fully react.
3. Neutralization: The pH value of the reaction solution is monitored by an acidity meter. When the pH value reaches a predetermined value, the addition of sodium hydroxide solution is stopped, and stirring is continued for a period of time to complete the reaction.
4. Cooling crystallization: The reaction solution is cooled to a certain temperature to precipitate sodium salicylate crystals.
5. Filtration Washing: The sodium salicylate crystals are separated from the mother liquor with a filtration apparatus, and the crystals are washed with water to neutrality.

4. post-treatment

1. Drying: The washed sodium salicylate crystal is placed in a drying device, and a certain temperature and vacuum degree are controlled to dry.
2. Crushing: The dried sodium salicylate crystals are crushed to obtain a product with a certain particle size.
3. Packaging: The crushed sodium salicylate product shall be packaged as required and stored in a dry, cool and ventilated warehouse.

5. product quality control

1. physical and chemical indicators: according to the relevant standards of sodium salicylate, detect the melting point, boiling point, density, refractive index and other physical and chemical indicators of the product.
2. Purity: Use high performance liquid chromatography or other appropriate methods to detect the purity of sodium salicylate in the product.
3. Heavy metal content: use atomic absorption spectrometry or other appropriate methods to detect the heavy metal content in the product to ensure compliance with relevant standards.
4. Microbiological indicators: microbial testing of the product to ensure that the product is sterile or meets the relevant microbial limit requirements.

6. Precautions

1. The operation process should strictly abide by the safety operation procedures, wear protective equipment, avoid contact with skin, eyes, etc.
2. Strictly control the reaction temperature and pH value to ensure the smooth progress of the reaction.
3. Regular inspection and maintenance of equipment to ensure normal operation of equipment and improve production efficiency and product quality.
4. Strengthen the cleanliness and hygiene management of the production site to keep the production environment clean and tidy.

7. Conclusion

Through the manufacturing method introduced in this article, high-quality sodium salicylate products can be produced. In the actual production process, the process parameters should be strictly controlled to ensure stable and reliable product quality. At the same time, strengthen the safety management and environmental protection of the production process to achieve green and efficient production.

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