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[Chemical Knowledge]：What are the upstream raw materials for terephthalic ether? What are the downstream products?

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Terephthalic ether is an important organic chemical raw material, which is widely used in medicine, pesticides, dyes, spices and other fields. In the field of raw materials for chemical production, the upstream and downstream related products of terephthalic ether mainly include the following aspects:

upstream products:

1. phenol: phenol is one of the main raw materials of terephthalic ether. terephthalic ether can be obtained through esterification reaction of phenol and methanol under the action of acidic catalyst, and then through dehydration, refining and other processes.
2. Methanol: Methanol is another important raw material in the production of terephthalic ether, which reacts with phenol to form terephthalic ether.

downstream products:

1. Terephthalic acid: Terephthalic ether can be converted into terephthalic acid through oxidation reaction. Terephthalic acid is the raw material for the production of polyester fiber, polyester resin, plastic and other important chemical products.
2. p-nitroanisole: p-nitroanisole can be obtained by the reaction of terephthalic ether and nitric acid. p-nitroanisole is an important intermediate of medicine and pesticide.
3. p-aminoanisole: p-nitroanisole can be obtained by reduction reaction, which is also an important intermediate of medicine and pesticide.

In summary, the upstream and downstream related products of terephthalic ether mainly involve phenol, methanol, terephthalic acid, p-nitroanisole, p-aminophenyl ether and other chemical products, which are widely used in medicine, pesticides, dyes, spices and other fields.

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