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

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Manufacturing method
of sodium nitrite
Sodium nitrite is an important chemical product, which is widely used in printing and dyeing, medicine, food and other fields. This article will introduce the manufacturing method of sodium nitrite.

1. raw materials and equipment

1 raw materials: sodium nitrate, sodium hydroxide, activated carbon.
2. Equipment: reaction kettle, filter, centrifuge, dryer, packaging machine.

2. manufacturing steps

1. preparation of sodium nitrate solution: sodium nitrate and water in accordance with a certain proportion of mixing, stirring, prepared into a certain concentration of sodium nitrate solution.
2. Add sodium hydroxide: Add the prepared sodium nitrate solution to the reaction kettle, and then slowly add sodium hydroxide while stirring to make the pH value of the solution reach a predetermined value.
3. Activated carbon adsorption: Activated carbon is added to the reaction solution and stirred for a certain period of time to fully adsorb the impurities in the solution.
4. Filtration and Centrifugation: The activated carbon was filtered off, and then the filtrate was centrifuged to obtain sodium nitrite crystals.
5. Drying and packaging: The sodium nitrite crystals are dried and then packaged to obtain the finished product.

3. Precautions

1. Control the proportion of sodium nitrate and sodium hydroxide to ensure the smooth progress of the reaction.
2. the amount of activated carbon should be appropriate to ensure the removal of impurities.
3. During the centrifugation process, the appropriate speed and time should be maintained to ensure the purity of the crystal.
4. The temperature and time should be controlled during the drying process to prevent the product from deteriorating.

4. safety and environmental protection requirements

1. In the production process, strictly abide by the safety operation procedures to ensure the safety of employees and equipment.
2. The waste water, waste gas and waste residue generated in the production process should be properly treated to meet the environmental protection requirements.

In short, the manufacture of sodium nitrite requires strict control of the proportion of raw materials, operation process and safety and environmental protection requirements to ensure product quality and safe and smooth production.

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