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[Chemical Knowledge]：What are the upstream raw materials for solvents and what are the downstream products?

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Solvents are widely used in the field of chemical production raw materials, and they can be used as reaction media, extractants, diluents, etc. The upstream and downstream associated products of solvents are also quite abundant, and some of the main associated products will be listed below.

upstream products:

1. Petroleum: Petroleum is the main raw material for many solvents, such as benzene, toluene, xylene, etc. These basic solvent products can be obtained by processes such as distillation and cracking of petroleum.
2. Natural gas: Natural gas can also be used as a raw material for the production of some solvents, such as methanol and ethanol.
3. Coal: Coal can be converted into synthesis gas through gasification, liquefaction and other processes, and then further synthesize some solvent products, such as methanol, ethanol and so on.

downstream products:

1. Coatings: Solvents play an important role in coatings. They can dissolve pigments and resins, adjust the viscosity and construction performance of coatings. Common solvents for coatings include alcohols, esters, ketones, etc.
2. Adhesive: solvent in the adhesive can also play a role in dissolving and adjusting viscosity, commonly used adhesive solvents are benzene, ketones, esters and so on.
3. cleaning agent: solvent in the cleaning agent as the main active ingredient, used to remove oil, stains and so on. Common cleaning agent solvents are hydrocarbons, chlorinated hydrocarbons, alcohols, etc.
4. Flavors and fragrances: Some solvents are also used as carriers of flavors and fragrances or for the preparation of flavors, such as ethanol, propylene glycol, etc.

In short, the upstream and downstream associated products of solvents are quite rich, and the fields involved are also very extensive. When selecting and using solvents, it is necessary to select the appropriate solvent type according to the specific production process and requirements.

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