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[Chemical Knowledge]：Production and manufacturing method and process flow of disodium dihydrogen pyrophosphate

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Disodium dihydrogen pyrophosphate (Disodium Pyrophosphate, DSPP) is a common raw material for chemical production, which is widely used in food, medicine, daily chemical industry and other fields. This article will detail the manufacturing method of disodium dihydrogen pyrophosphate.

1. Manufacturing Principle

Disodium dihydrogen pyrophosphate is prepared by reacting phosphoric acid with sodium hydroxide. During the reaction, phosphoric acid reacts with sodium hydroxide to form sodium hydrogen phosphate, and sodium hydrogen phosphate reacts with sodium hydroxide to form disodium dihydrogen pyrophosphate.

2. Manufacturing Steps

1. Preparation of Raw Materials
The production of disodium dihydrogen pyrophosphate
requires the preparation of the following raw materials: phosphoric acid (H3PO4), sodium hydroxide (NaOH), and water (H2O).

2. The ratio of raw materials to

According to the reaction equation, the molar ratio of phosphoric acid to sodium hydroxide is 1:2. In the actual production process, the ratio can be adjusted appropriately according to the production equipment and process conditions.

3. mixing reaction

add phosphoric acid and sodium hydroxide into the reaction kettle according to the proportion, add appropriate amount of water, and stir well. During the stirring process, the reaction will generate a large amount of heat, and the reaction temperature needs to be controlled to avoid too high or too low temperature affecting the reaction process.

4. Neutralization and adjustment

After the reaction is over, it is necessary to adjust the pH value to neutral or slightly acidic with acidic substances such as hydrochloric acid or sulfuric acid to prevent product deterioration.

5. crystallization separation

cooling the reaction liquid to a certain temperature, disodium dihydrogen pyrophosphate will crystallize out. The crystals are separated from the mother liquor by equipment such as a centrifuge or a filter.

6. Drying packaging

The crystallized disodium dihydrogen pyrophosphate is dried to remove water. The dried product is packaged to obtain the finished disodium dihydrogen pyrophosphate.
Precautions for
3.

1. In the production process, the quality and proportion of raw materials must be strictly controlled to ensure stable product quality.
2. During the reaction, the temperature should be controlled to avoid too high or too low temperature affecting the reaction process.
3. In the crystallization separation process, the cooling rate and temperature should be controlled to obtain high-quality crystalline products.
4. During the drying process, attention should be paid to controlling the drying temperature and time to avoid product deterioration or damage.

4. application field

disodium dihydrogen pyrophosphate as an important chemical production raw material, widely used in the following fields:

1. food additives: disodium dihydrogen pyrophosphate can be used as food additives, can improve the taste and stability of food and so on.
2. Pharmaceutical raw materials: Disodium dihydrogen pyrophosphate can be used as raw materials in the pharmaceutical field to participate in the preparation of some drugs and medical supplies.
3. Daily chemical industry: disodium dihydrogen pyrophosphate can be used in the preparation of detergents, cosmetics and other products in the field of daily chemical industry.

In short, the manufacturing method of disodium dihydrogen pyrophosphate is not complicated, but it is necessary to pay attention to the control of various process parameters in the production process to ensure product quality and stability. At the same time, disodium dihydrogen pyrophosphate is widely used in various fields, which brings great convenience to people's daily life and industrial production.

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