1. What is purified terephthalic acid? Purified terephthalic acid, the chemical formula is C8H6O4, is a white crystal at room temperature. It is one of the important derivatives of diphenyl ether and unsaturated acid. 2. Properties of purified terephthalic acid: The melting point of purified terephthalic acid is 300°C. It is difficult to dissolve in water and easily soluble in solvents such as ethanol, benzene and acetic acid. It has strong acidity and electrophilicity, and can undergo substitution reactions with some electrophilic reagents.
3. Applications of purified terephthalic acid Purified terephthalic acid is widely used in the manufacturing of high-performance polyester fibers, polyurethane elastomers, high-performance coatings, high-performance plastics and other fields. In addition, purified terephthalic acid can also be used as an intermediate for dyes and pharmaceuticals. 4. Harm of purified terephthalic acid: The vapor and dust of purified terephthalic acid are irritating to the eyes, skin and respiratory tract, and may cause skin allergies, respiratory diseases, etc.
Therefore, protective measures should be taken during use. 5. Safety measures for purified terephthalic acid When using purified terephthalic acid, you must wear appropriate protective equipment, such as protective glasses, gloves, respirators, etc. At the same time, attention should be paid to fire and explosion protection, and keep away from heat and fire sources. If the vapor is accidentally inhaled or enters the eyes or skin, rinse immediately with plenty of water. If you feel unwell, you should seek medical treatment in time.
6. How to store refined terephthalic acid Refined terephthalic acid should be stored in a cool, dry, well-ventilated place, away from direct sunlight and moisture. At the same time, contact with oxidants, weak bases, strong reducing agents and other substances should be avoided. Packaging and containers should be checked regularly for damage and leakage during storage. 7. Substitutes for purified terephthalic acid Since purified terephthalic acid itself has certain hazards, the development and application of substitutes has attracted more and more attention.
Currently, some research institutions are exploring the development of low-toxic, environmentally friendly alternatives, such as phenol-type green acid catalysts. 8. Conclusion Purified terephthalic acid has important applications in industrial production and scientific research, but it also has certain hazards. In order to ensure personal safety and environmental protection, it is very important to store and use purified terephthalic acid correctly.
