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

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Xylene is an important chemical raw material, which is widely used in the production of various chemicals. Its upstream and downstream related products are numerous, and some of the main products are listed below.

upstream products:

1. Petroleum: Xylene is mainly extracted from petroleum, especially catalytic reforming and pyrolysis gasoline.
2. Coal tar: Coal tar also contains xylene, which can be extracted by fractionation.

downstream products:

1. Phthalic anhydride (Phthalic Anhydride): Xylene can be oxidized to produce phthalic anhydride, which is an important organic chemical raw material, mainly used to produce unsaturated polyester resins and plasticizers.
2. Polyester (Polyester): xylene can produce polyester through oxidation, esterification, polycondensation and other steps, which is a common synthetic fiber.
3. Coatings and paints: Xylene can be used as a solvent for the production of coatings and paints, as well as raw materials for the production of coatings and paints, such as acrylic emulsions.
4. Plastics: Xylene can be used as a raw material for the production of certain plastics, such as polystyrene.
5. Pharmaceutical intermediates: Some derivatives of xylene can be used as pharmaceutical intermediates for the production of drugs, such as certain antibiotics and anticancer drugs. The

above only lists a part of the upstream and downstream related products of xylene. In fact, xylene is widely used in the field of raw materials for chemical production, and there are many products involved.

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