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

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Maleic acid, also known as maleic acid, is a dicarboxylic acid with unsaturated double bonds, which is widely used in the field of chemical production raw materials. There are many upstream and downstream related products of maleic acid, and the main upstream and downstream products of maleic acid will be introduced below.

upstream products:

1. petrochemical raw materials: maleic acid production is mainly based on petrochemical raw materials, such as benzene, propylene and so on. These raw materials undergo oxidation, hydrolysis and other reaction processes to generate maleic acid.

downstream products:

1. Unsaturated polyester resin (UPR): Maleic acid can be used as a crosslinking agent for unsaturated polyester resins to improve the heat resistance, chemical resistance and mechanical properties of the resin.
2. coatings: maleic acid can be used to prepare high-performance coatings to improve the weather resistance, light retention and chemical resistance of coatings.
3. Food additives: Maleic acid can be used as a food additive to adjust the taste and acidity of food, as well as as a preservative.
4. Pharmaceutical intermediates: Maleic acid can be used as pharmaceutical intermediates for the production of antibiotics, antipyretic analgesics and other drugs.

There are some important derivatives in the upstream and downstream related products of maleic acid, such as:

1. Maleic anhydride: Maleic anhydride is an important derivative of maleic acid, which is widely used in the preparation of unsaturated polyester resins, coatings, pharmaceutical intermediates, etc.
2. Fumaric acid: Fumaric acid is an isomer of maleic acid, which also has unsaturated double bonds and carboxyl groups. It can be used in the production of food additives and pharmaceutical intermediates.

In summary, there are many upstream and downstream related products of maleic acid, which are widely used in various fields. With the continuous development of science and technology, the application field of maleic acid and its related products will continue to expand.

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