O-Phthalic Anhydride (CAS: 85-44-9) is an organic compound with the chemical formula C₆H₄(CO)₂O. It is a colorless, crystalline solid that has a strong, pungent odor and is used primarily in the production of phthalic acid derivatives.
Key Properties:
- Appearance: O-Phthalic anhydride is a colorless or white crystalline solid.
- Punto de fusión: It melts at 131°C (268°F).
- Punto de ebullición: Its boiling point is approximately 337°C (639°F).
- Solubility: It is slightly soluble in water but more readily soluble in organic solvents such as alcohols, ethers, and benzene.
- Odor: It has a strong, olor acre, often described as sharp or acrid.
Usos comunes:
- Production of Phthalic Acid Derivatives: O-Phthalic anhydride is primarily used in the production of phthalic acid and its derivatives, which are key intermediates in manufacturing plastificantes (like di(2-ethylhexyl)phthalate, or DEHP), dyes, y resinas.
- Resinas de poliéster: It is used in the production of unsaturated polyester resins. These resins are crucial for manufacturing fiberglass, piezas de automóviles, y recubrimientos.
- retardantes de llama: O-Phthalic anhydride is involved in producing certain flame retardants, which are added to plastics, textiles, and coatings to improve their resistance to fire.
- Plastificantes: It is also used in producing plasticizers, particularly phthalates, which are added to plastics to increase flexibility, durabilidad, and workability.
- Alkyd Resins: The compound is used in making alkyd resins that are utilized in paints, barnices, and other coatings.
Salud y Seguridad:
- Toxicidad: O-Phthalic anhydride can cause irritación de la piel, problemas respiratorios, y daño ocular al ser expuestos. Inhalation of its fumes or dust should be avoided.
- Impacto ambiental: It should be handled with care, as improper disposal can lead to pollution, particularly in aquatic environments.
Conclusión:
O-Phthalic anhydride is a versatile chemical compound primarily used in the production of phthalic acid derivatives, polyester resins, y plastificantes. It plays a critical role in the manufacture of plásticos, recubrimientos, y fibers. Sin embargo, due to its toxicity and environmental concerns, safe handling and disposal practices are essential.
