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

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Phthalic acid (Phthalic acid, referred to as PA) is an important organic chemical raw materials, widely used in plastics, fibers, coatings, pharmaceuticals, pesticides and other fields. There are many upstream and downstream related products of phthalic acid, and some of the main upstream and downstream products are listed below.

upstream products:

1. phthalic anhydride (Phthalic Anhydride): phthalic anhydride is the main raw material of phthalic acid, prepared by peroxide benzene.
2. Sulfuric acid (Sulfuric Acid): In the production of phthalic acid, sulfuric acid is used as a catalyst.

downstream products:

1. dioctyl phthalate (Dioctyl Phthalate, referred to as DOP):DOP is a commonly used plasticizer, used to improve the flexibility and ductility of plastics, widely used in polyvinyl chloride (PVC) products, wire and cable, artificial leather and other fields.
2. dibutyl phthalate (Dibutyl Phthalate, referred to as DBP):DBP is also a commonly used plasticizer, used in polyvinyl chloride, cellulose resin, ethyl acetate cellulose and other plastics.
3. Diethyl phthalate (Diethyl Phthalate, DEP for short):DEP is used as a solvent, plasticizer and fragrance, and can also be used to produce phthalic anhydride and other phthalate esters.
4. Potassium hydrogen phthalate (Potassium Biphthalate): Potassium hydrogen phthalate is a commonly used chemical reagent used as an acid-base indicator and buffer.

In short, phthalic acid has an important position in the field of chemical production raw materials. Its upstream and downstream related products are extensive, involving many fields, such as plastics, fibers, coatings, medicines, pesticides, etc.

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