Pyromellitic dianhydride CAS 89-32-7 Overview
- Pyromellitic dianhydride (PMDA, CAS 89-32-7) is a high-performance aromatic dianhydride widely used as a key intermediate in the synthesis of polyimide resins, electronic materials, and advanced high-temperature polymers.
- Due to its rigid benzene structure and high thermal stability, PMDA plays a critical role in applications requiring excellent heat resistance and dimensional stability.
Typical Industrial Uses of PMDA
- Polyimide (PI) resins for electronic materials
- High-temperature insulating coatings
- Specialty epoxy and advanced polymer systems
Reaction Background of Pyromellitic Dianhydride Production
The industrial production of pyromellitic dianhydride typically involves the gas-phase oxidation of durene over vanadium-based catalysts.
Two main oxidation mechanisms are commonly discussed:
- Lattice oxygen abstraction
- Oxidation via adsorbed oxygen species
Reaction Network and By-Product Formation
- Trimethylbenzaldehydes
- Dimethyl terephthalaldehydes
- Methyl trimellitate
- Pyromellitic acid and diphthalide
- Minor methylphthalide and phthalic derivatives
- Carbon dioxide (CO₂) from deep oxidation
Due to the complexity of the oxidation network, process control and catalyst optimization are critical to ensure consistent PMDA quality in industrial applications.
Industrial Availability of Pyromellitic Dianhydride (CAS 89-32-7)
- Pyromellitic dianhydride (CAS 89-32-7) is commercially available for industrial use, particularly in the manufacture of electronic materials and polyimide resins.
- For detailed product specifications, grades and application-specific availability information, please contact our sales team for professional support.
FAQ
Q: What is the CAS number of pyromellitic dianhydride?
A: The CAS number of pyromellitic dianhydride is 89-32-7, commonly referred to as PMDA.
Q: Why is process control important in PMDA production?
A:Controlled oxidation helps reduce by-products and ensures consistent PMDA quality, which is essential for advanced polymer and electronic material applications.
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