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[Chemical Knowledge]：Properties, uses, upstream and downstream raw materials, storage methods, sodium diethyl phosphite

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Properties of diphenyl phosphite

Diphenyl phosphite (Diphenyl phosphite) is an organophosphorus compound with the chemical formula (C6H5O)2P(O)H. It is usually a colorless to pale yellow transparent liquid with a faint aromatic odor. The compound is insoluble in water, but soluble in most organic solvents, such as ethanol, ether and benzene. Its molecular weight is 218.19g/mol, the melting point is between 10-12°C, the boiling point is about 340°C, and it has good chemical stability under normal temperature and pressure.

Use of diphenyl phosphite

As an important organic phosphorus compound, diphenyl phosphite is widely used in many fields. The main uses include:

Antioxidants and stabilizers: In the plastics and rubber industry, diphenyl phosphite is commonly used as an antioxidant and heat stabilizer to effectively prevent material degradation due to high temperature or oxidation during processing and use.
Intermediate: It is an important intermediate for the synthesis of a variety of organophosphorus compounds, especially in the production of pesticides, flame retardants and plastic additives.
Catalyst: In organic synthesis, diphenyl phosphite can also be used as a catalyst to promote the progress of certain chemical reactions and improve the selectivity and efficiency of the reaction.

Phosphoric acid phosphate upstream and downstream raw materials

Upstream raw materials

The production of diphenyl phosphite mainly depends on the following upstream raw materials:

Phenol: Phenol is the most important organic raw material in the synthesis of diphenyl phosphite. Phenol is produced by the reaction of chloroform and caustic soda, and then further reacted with phosphorus trichloride to form diphenyl phosphite.
Phosphorus trichloride: Phosphorus trichloride is another key raw material, obtained by the direct reaction of phosphorus and chlorine gas. In the synthesis process, phosphorus trichloride reacts with phenol to produce an intermediate, which is then reduced by hydrogenation to give diphenyl phosphite.

Downstream Products

The downstream products of diphenyl phosphite mainly include:

Antioxidants and stabilizers: As additives for plastics and rubber, these downstream products have a wide range of applications in improving the heat resistance and oxidation resistance of materials.
Pesticides and flame retardants: Using diphenyl phosphite as an intermediate, a variety of efficient pesticides and flame retardants can be synthesized to improve the performance and stability of these products.

Diphenyl phosphite storage method

Since diphenyl phosphite has a certain chemical activity, the correct storage method is essential for its safety and stability:

Storage environment should be stored in a cool, dry, well-ventilated warehouse, avoid direct sunlight and high temperature environment. Suitable storage temperatures are between 15-25°C.
Container selection: Diphenyl phosphite should be stored in a well-sealed glass or plastic container, avoiding contact with air to prevent oxidative deterioration.
Fire and explosion prevention measures: although the compound is not flammable, it may decompose at high temperature to generate toxic smoke. Therefore, the storage area should be far away from fire and heat sources, to ensure that the fire fighting equipment is complete, and open flames are prohibited in the warehouse.
Moisture-proof and pollution -proof: The mixing of moisture and other chemical substances should be prevented, and the tightness of the storage container should be checked regularly to avoid product contamination or deterioration.

Conclusion

As an important organophosphorus compound, diphenyl phosphite plays an important role in the fields of plastics, rubber, pesticides and flame retardants because of its excellent chemical properties and wide range of uses. Through the rational use of its upstream and downstream raw materials and the correct storage method, the stability of its quality and performance can be effectively guaranteed. In the future development, with the continuous emergence of new technologies and new materials, the application prospects of diphenyl phosphite will be broader, providing greater assistance for the development of related industries.

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