Purified terephthalic acid, with the chemical formula C8H6O4, is a white crystal at room temperature. It is one of the important derivatives of diphenyl ether and unsaturated acid.
Properties
The melting point of purified terephthalic acid is 300℃. It is insoluble 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.
Application
Purified terephthalic acid is widely used in the manufacture 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 drugs.
Hazards
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.
Safety measures
When using purified terephthalic acid, appropriate protective equipment such as protective glasses, gloves, respirators, etc. must be worn. At the same time, attention should be paid to fire prevention and explosion prevention, and stay away from heat and fire sources. If the vapor is accidentally inhaled or enters the eyes or skin, rinse with plenty of water in time. If you feel unwell, seek medical treatment in time.
How to store
Pure terephthalic acid should be stored in a cool, dry, well-ventilated place, away from direct sunlight and moisture. At the same time, it should be avoided from contact with oxidants, weak bases, strong reducing agents and other substances. During storage, the packaging and containers should be checked regularly for damage and leakage.
