Manufacturing Method of Sodium Nitrite
Sodium Nitrite is an important chemical, widely used in printing and dyeing, medicine, food and other fields. This article will introduce the manufacturing method of sodium nitrite.
I. Raw materials and equipment
1. Raw materials: sodium nitrate, sodium hydroxide, activated carbon.
2. Equipment: reactor, filter, centrifuge, dryer, packaging machine.
II. Manufacturing steps
1. Preparation of sodium nitrate solution: mix sodium nitrate and water according to a certain proportion, stir well, and prepare a certain concentration of sodium nitrate solution.
2. Add sodium hydroxide: Add prepared sodium nitrate solution to the reactor, then slowly add sodium hydroxide while stirring, so that the pH value of the solution reaches a predetermined value.
3. Activated carbon adsorption: Add activated carbon into the reaction solution and stir for a certain period of time to make the activated carbon fully adsorb the impurities in the solution.
4. Filtration and centrifugation: Filter out the activated carbon, and then centrifuge the filtrate to obtain sodium nitrite crystals.
5. Drying and packaging: Dry the sodium nitrite crystals, and then pack them to get the finished product.
3. Precautions
1. Control the ratio of sodium nitrate and sodium hydroxide to ensure the smooth progress of the reaction.
2. The dosage of activated carbon should be appropriate to ensure the removal effect of impurities.
3. Maintain proper speed and time during centrifugation to ensure the purity of the crystals.
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 observe the safety operation regulations to ensure the safety of employees and equipment.
2. Waste water, waste gas and waste residue produced in the production process should be properly treated to meet the environmental requirements.
In short, the manufacture of sodium nitrite requires strict control of the ratio of raw materials, operation process and safety and environmental protection requirements to ensure the quality of the product and the safe and smooth production.
