Phthalic Anhydride
- CAS No.85-44-9
- GradeIndustrial / Pharmaceutical
- Availability● In Stock
High-purity phthalic anhydride (CAS 85-44-9) for use as a key intermediate in agrochemical and polymer synthesis.
Request Bulk PricingProduct Technical Details
Product Overview
Phthalic anhydride is a vital aromatic dicarboxylic acid derivative widely employed in the chemical industry as a foundational building block for numerous synthetic pathways. With the molecular formula C8H4O3 and a CAS number of 85-44-9, it appears as a white flake or crystalline powder with excellent thermal stability and reactivity. This compound serves as a critical intermediate in the production of agricultural chemicals, plasticizers, unsaturated polyester resins, and dyes.
Specifications
| Molecular Formula | C8H4O3 |
|---|---|
| Molecular Weight | 148.12 g/mol |
| Melting Point | 129–132 °C |
| Boiling Point | 284 °C |
| Density | 1.4 ± 0.1 g/cm³ |
| Flash Point | 152 °C |
| Assay (GC) | ≥99.5% |
| Free Acid | ≤0.2% |
| Solidification Point | ≥130.5 °C |
| Melting Color (APHA) | ≤20 |
| Heating Color (APHA) | ≤50 |
| Sulphuric Acid Color Index (APHA) | ≤40 |
Industrial Applications
Phthalic anhydride is primarily utilized as a chemical intermediate in the synthesis of several important agrochemicals, including Folpet (CAS 133-07-3), Phosmet (CAS 732-11-6), and Bentazone (CAS 25057-89-0). Beyond crop protection formulations, it plays a central role in manufacturing:
- Unsaturated polyester resins for composites and coatings
- Alkyd resins used in architectural and industrial paints
- Plasticizers such as dioctyl phthalate (DOP) for PVC flexibility
- Dyes and pigments, including anthraquinone derivatives
Its high reactivity toward nucleophiles—particularly alcohols and amines—makes it ideal for esterification and amidation reactions under controlled industrial conditions.
Handling and Storage
Store in a cool, dry, and well-ventilated area away from moisture, heat sources, and incompatible materials such as strong oxidizers or bases. Standard packaging is 25 kg drums, with custom options available upon request to meet global logistics and regulatory requirements.
