Adipic Acid Green Synthesis Process

With tungsten oxide as catalyst active component, because of its acidity and redox properties and is widely used in the selective oxidation of olefins, alkanes isomerization, the selective reduction and other reactions of nitrogen and oxygen compounds. In addition, as a photocatalyst WO₃ has many potential applications, such as energy conversion, virus inactivation, organic pollutant degradation, and so on.

Adipic acid (AA) is an important organic chemical raw materials, mainly used in plastics, resin, food and other fields, can be used in the manufacture of nylon 6, -6, plasticizer, lubricant, polyurethane foam, a little used as food by acid and tartaric acid to fermentation agent instead of powder, can also be used as intermediates for the manufacture of pesticides and adhesive, and the production of medicine, spice and so on. However, the traditional synthesis technology of adipic acid is mainly nitric acid oxidation. The method uses strong nitric acid as oxidant, and the equipment in production process is seriously corroded, and produces a lot of N₂O pollutants.

Tungsten trioxide-based catalysts are the currently widely available solutions that can be used to replace acid catalysts, the use of a supported tungsten containing catalyst can improve the catalytic activity and recycling of tungsten oxide. Some scholars have found that with SnO₂ as the carrier, tungsten loaded catalysts have been synthesized by impregnation, which can show better catalytic activity than other carriers.

In addition, through the characterization results, we can know that the tungsten oxide species in WO₃/SnO₂ catalyst supported on SnO₂ are low in crystallinity and small in size, and highly dispersed on the catalyst surface, which is the main reason for the high activity of the catalyst. Through stability experiment showed that WO₃/SnO₂ can be reused for 6 times, and the yield of adipic acid remained above 80%, indicating the existence of a strong interaction between the tungsten species and SnO₂ carrier, the catalyst has high stability, and provides a new way for developing new green synthesis process for adipic acid.

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