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[Chemical Knowledge]：What are the upstream raw materials for white phosphorus? What do the downstream products contain?

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As an important chemical raw material, white phosphorus plays an important role in the chemical industry. Its upstream and downstream related products are numerous, covering a wide range of applications. This article will detail the upstream and downstream associated products of white phosphorus.

1. white phosphorus upstream products

1. phosphate rock: phosphate rock is the main raw material of white phosphorus, which is rich in phosphorus. Phosphate ore can be used to produce white phosphorus after crushing, grinding, acid hydrolysis and other processes.
2. Sulfuric acid: In the process of producing white phosphorus, sulfuric acid plays a key role as a catalyst and dehydrating agent. Sulfuric acid reacts with the phosphate concentrate to produce white phosphorus and calcium hydrogen sulfate.
3. Coke: Coke is used as a reducing agent in the production of white phosphorus and reacts with phosphorus concentrate and sulfuric acid to generate white phosphorus and carbon dioxide.

2. white phosphorus downstream products

1. phosphorus trichloride: phosphorus trichloride reaction with chlorine, phosphorus trichloride can be generated. Phosphorus trichloride is an important chemical raw material, which can be used to produce pesticides, pharmaceutical intermediates, flame retardants and so on.
2. Phosphorus pentachloride: White phosphorus reacts with chlorine at a higher temperature to generate phosphorus pentachloride. Phosphorus pentachloride is used as a chlorinating agent, a catalyst, a dehydrating agent, and the like.
3. organic phosphorus compounds: white phosphorus and alcohol, acid and other organic reaction, can generate a variety of organic phosphorus compounds, such as phosphate, phosphate and so on. These compounds are widely used in the fields of pesticide, medicine, flame retardant and so on.
4. Phosphine: White phosphorus reacts with water to form phosphine gas. Phosphine is used as a dopant for semiconductor materials, optical fibers, and as a raw material for the preparation of other phosphides.

3. the upstream and downstream related products of white phosphorus application

the upstream and downstream related products of white phosphorus are widely used in agriculture, medicine, electronics, building materials, chemical industry and other fields. For example, phosphorus trichloride can be used to produce pesticides such as trichlorfon and methyl parathion; phosphorus pentachloride can be used to produce lithium hexafluorophosphate, an electrolyte for lithium-ion batteries; organophosphorus compounds can be used as plastics, Flame retardants for rubber, fibers, etc., and additives such as hydraulic oil and lubricating oil; phosphine can be used to prepare semiconductor materials such as gallium arsenide and indium phosphide.

4. white phosphorus production process and environmental protection requirements

white phosphorus production process mainly includes acid hydrolysis and electrolysis. The acid hydrolysis method is to react phosphate rock with sulfuric acid to generate white phosphorus and calcium sulfate; the electrolytic method is to produce white phosphorus by electrolytic phosphate solution. Regardless of the method, environmental requirements need to be considered, such as waste residue, waste gas, waste water treatment and discharge. Therefore, in the production process, a series of environmental protection measures need to be taken to ensure that the production process meets environmental protection standards.

In short, white phosphorus as a raw material for chemical production, its upstream and downstream related products are numerous, a wide range of applications. In the production process, it is necessary to pay attention to environmental protection requirements, improve resource utilization, and promote the sustainable development of the chemical industry.

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