Description
🔬 Technical Specifications of Phthalic Anhydride
| Property | Specification |
|---|---|
| Product Name | Phthalic Anhydride |
| Chemical Formula | C₈H₄O₃ |
| CAS Number | 85-44-9 |
| Molecular Weight | 148.12 g/mol |
| Appearance | White crystalline flakes or powder |
| Purity | ≥ 99.5% |
| Melting Point | 130 – 132°C |
| Boiling Point | 284°C (decomposes) |
| Acidity (as maleic acid) | Max. 0.25% |
| Freezing Point | Min. 131°C |
| Specific Gravity | ~1.53 at 20°C |
| Packaging | 25 kg bags, 500 kg jumbo bags, or bulk |
| Storage | Cool, dry, and well-ventilated area |
🔧 Applications of Phthalic Anhydride
1. Plasticizers (Phthalates)
The most significant use of Phthalic Anhydride is in the production of phthalate plasticizers, such as Dioctyl Phthalate (DOP) and Diisononyl Phthalate (DINP). These compounds increase flexibility in PVC and other plastic materials.
2. Alkyd and Polyester Resins
Used in alkyd resins, which are vital for paints, varnishes, and coatings, Phthalic Anhydride enhances properties like durability, gloss, and chemical resistance.
3. Unsaturated Polyester Resins (UPR)
It is a key raw material in UPRs, widely used in the automotive, marine, and construction industries for manufacturing fiberglass-reinforced plastics.
4. Dyes and Pigments
Phthalic Anhydride is a core ingredient in the synthesis of phthalocyanine dyes, especially blue and green pigments used in plastics, inks, and coatings.
5. Agrochemicals and Pharmaceuticals
Also used as an intermediate in the production of certain herbicides, fungicides, and bulk drugs, including vitamin B1 derivatives.
✅ Key Benefits
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✔️ High chemical reactivity for flexible manufacturing processes
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✔️ Excellent purity and consistency for industrial-scale production
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✔️ Suitable for multiple downstream chemical applications
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✔️ Enhances the weather resistance and mechanical strength of resins
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✔️ Efficient for large-scale production of plasticizers and pigments
⚠️ Safety and Handling
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Use protective gear: gloves, goggles, and respirators if needed
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Store in sealed containers to prevent moisture absorption
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Avoid inhalation of dust or vapors
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Ensure proper ventilation during processing
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Follow local regulations for disposal and spillage management
📌 Conclusion
Phthalic Anhydride is an essential intermediate chemical with broad applications in the plastics, coatings, dyes, and construction industries. Its high purity, ease of handling, and cost-effectiveness make it a preferred choice for manufacturers seeking performance and versatility. Whether used in plasticizers, resins, or pigments, Phthalic Anhydride is indispensable for producing durable, flexible, and visually appealing products across many sectors.
