[Chemical Knowledge]：Production and manufacturing method and process flow of potassium dihydrogen phosphate

The manufacturing method

of potassium dihydrogen phosphate Potassium dihydrogen phosphate is an important chemical product, which is widely used in agriculture, medicine, food and other fields. In the field of chemical production raw materials, the production method of potassium dihydrogen phosphate has attracted much attention. This article will introduce a common method of manufacturing potassium dihydrogen phosphate.

1. Raw material preparation

1. Potassium hydroxide: Select potassium hydroxide with higher purity to ensure the quality of the final product.
2. Phosphoric acid: industrial grade phosphoric acid is generally used, and the content of H3PO4 is above 85%.

2. manufacturing process

1 ingredients: according to a certain proportion of potassium hydroxide and phosphoric acid into the reactor. Generally, the molar ratio of potassium hydroxide to phosphoric acid is 1:1.
2. Reaction: In the reaction kettle, potassium hydroxide and phosphoric acid are neutralized to generate potassium dihydrogen phosphate and water. The reaction temperature is controlled during the reaction, generally in the range of 50-80°C. At the same time, stirring is required to ensure that the reaction proceeds uniformly.
3. Filtration: After the reaction, impurities that may exist in the reaction solution, such as unreacted potassium hydroxide or phosphoric acid, are removed by filtration.
4. Crystallization: The filtered clear liquid is cooled to a certain temperature to crystallize potassium dihydrogen phosphate. During the crystallization process, the cooling speed and stirring speed should be controlled to obtain crystals with suitable particle size.
5. Centrifugation: The crystallized solid is separated from the mother liquor by a centrifuge to obtain a crude product of potassium dihydrogen phosphate.
6. Drying: The crude product is placed in a drying apparatus to remove moisture adhering to the surface. The general use of hot air drying or vacuum drying and other ways.
7. Sieving: The dried product is sieved to remove the part that does not meet the particle size requirements to obtain the final potassium dihydrogen phosphate product.
Precautions for
3.

1. In the batching process, the accuracy and uniformity of raw materials should be ensured to avoid affecting the quality of the final product.
2. During the reaction, the reaction temperature and stirring speed should be strictly controlled to ensure the smooth progress of the reaction and the uniformity of the product.
3. During the crystallization process, the cooling speed and stirring speed should be controlled to obtain the ideal crystal size.
4. In the centrifugal separation process, the appropriate centrifuge model and operating parameters should be selected to improve the separation efficiency.
5. The drying temperature and time should be controlled during the drying process to avoid overheating or excessive drying of the product.
6. In the screening process, the appropriate screen aperture should be selected according to the product requirements to ensure that the particle size distribution of the product meets the requirements.

4. yield and cost

The yield of potassium dihydrogen phosphate is related to the purity of raw materials, reaction conditions, operating skills and other factors. In general, the use of higher purity raw materials, optimization of reaction conditions and operating skills, can improve the yield of the product. At the same time, reducing production costs is also a key factor in improving production efficiency. Therefore, effective measures should be taken to reduce the cost of raw materials, energy and manpower in the production process.

5. Three Wastes Treatment and Environmental Protection

Waste water, waste gas, waste residue and other three wastes produced in the production process of chemical products have a certain impact on the environment. Therefore, in the process of producing potassium dihydrogen phosphate, effective treatment measures should be taken to reduce environmental pollution. For example, waste water can be discharged or recycled after treatment to meet the standard, waste gas can be treated by adsorption or combustion, and waste residue can be used for resource utilization or safe landfill.

6. quality control and testing

In order to ensure the quality of potassium dihydrogen phosphate products, strict quality control and testing are required in the production process. It generally includes the quality inspection of raw materials, on-line monitoring in the production process, and the quality inspection of finished products. At the same time, a complete quality management system should be established to ensure the stability of the production process and the reliability of product quality.

In short, the manufacturing method of potassium dihydrogen phosphate involves multiple links and factors, which require producers to have rich practical experience and operational skills. In the production process, we should pay attention to the optimization and improvement of raw material selection, reaction condition control, crystallization technology, centrifugal separation technology, etc., in order to improve the quality and yield of products. At the same time, strengthening the three waste treatment and environmental protection work is also an important aspect to ensure the sustainable development of production.