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

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Ortho-xylene (o-xylene) is an important chemical raw material, which is widely used in the production of various chemicals. The following are the upstream and downstream related products of ortho-xylene:

Upstream products:

1. Petroleum: Ortho-xylene is mainly extracted from petroleum and obtained through processes such as catalytic reforming and aromatic extraction.

downstream products:

1. Phthalic anhydride (Phthalic anhydride): o-xylene can be oxidized to generate phthalic anhydride, which is the main raw material for the production of unsaturated polyester resin (UPR) and can also be used to produce plasticizers and dyes.
2. phthalate esters (Phthalate esters): o-xylene can react with anhydride to generate phthalate esters, which are commonly used as plastic plasticizers and can also be used in the production of coatings, adhesives, etc.
3. Dyes: o-xylene can be used to produce a variety of dyes, such as acid dyes, direct dyes, disperse dyes, etc.
4. Pharmaceutical intermediates: o-xylene can be used as pharmaceutical intermediates for the production of antibiotics, antipyretic analgesics and other drugs.

In short, as an important chemical raw material, o-xylene has a wide range of applications in the field of chemical production raw materials, and its upstream and downstream related products cover many fields, such as plastics, coatings, dyes, medicine, etc.

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