1, purified terephthalic acid
This product is white crystal or powder at room temperature, with low toxicity and flammability. If it is mixed with air, it will burn or even explode in case of fire within a certain limit. Its self-ignition point is 680℃, ignition point is 384~42 1℃, sublimation heat is 98.4kJ/mol, and combustion heat is 3225.9kJ/mol. Soluble in alkali solution, slightly soluble in hot ethanol, insoluble in water, ether, glacial acetic acid and chloroform.
2. Ethylene glycol
Ethylene glycol is also called "ethylene glycol" and "1 2- ethylene glycol". Ethylene glycol is a colorless and odorless sweet liquid, which is toxic to animals. The lethal dose to human is about 1.6 g/kg. Ethylene glycol is soluble in water and acetone, but insoluble in ether. Used as solvent, antifreeze and raw material for synthetic polyester.
Extended data
Use of PTA:
PTA is one of the important bulk organic raw materials, which is widely used in chemical fiber, light industry, electronics, construction and other aspects of the national economy. At the same time, the application of PTA is relatively concentrated. More than 90% of PTA in the world is used to produce polyethylene terephthalate (PET).
The production of 1 ton PET requires 0.85-0.86 tons of PTA and 0.33-0.34 tons of MEG. Polyester includes fiber chips, polyester fibers, bottle chips and film chips. In the domestic market, 75% PTA is used to produce polyester fiber; 20% is used to produce bottle-grade polyester, which is mainly used for the packaging of various beverages, especially carbonated beverages; 5% is used in film-grade polyester, mainly used in packaging materials, films and adhesive tapes.
It can be seen that the downstream extension products of PTA are mainly polyester fibers.
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