Purified Terephthalic Acid CAS 100-21-0

Refined terephthalic acid (PTA) is a low-toxicity and flammable white crystal or powder with a chemical formula of C₈H₆O₄ and a density of 1.55g/cm³, which is slightly soluble in hot ethanol and insoluble in water. This substance is made of paraxylene as raw material, through liquid phase oxidation to produce crude terephthalic acid, and then hydrorefining, crystallization and other processes, mainly used in the production of polyester fibers, polyester plastics and dye intermediates.

PTA is stable at room temperature, with a burning heat of 3225.9kJ/mol, and should avoid contact with oxidants and acids and alkalis. The transportation is in the form of anti-static stainless steel tank trucks or bags, and the storage needs to be placed in a cool and ventilated special warehouse, away from fire sources. As a low-toxicity substance, protective equipment should be worn to avoid skin irritation or respiratory reactions caused by long-term exposure, and the concentration in the working environment should be controlled below 0.1mg/m³.

Production method

in order to Paraxylene As raw materials, liquid phase oxidation is coarse terephthalic acid, re-sutra Hydrorefining, crystallized, separated, dried, and refined terephthalic acid was obtained.

Product performance

This product is white crystal or powder, low toxicity and flammable. If mixed with air, it will burn or even explode within a certain limit. its Spontaneous ignition point680°C, ignition point 384~421°C,Sublimation fever 98.4kJ/mol, heat of combustion 3225.9kJ/mol, density 1.55g/cm3. Soluble in alkali solution, slightly soluble in heatethanol, insoluble in water,ethyl et her、glacial acetic acid and chloroform。

use

This product is manufactured terylene It can be directly related to ethylene glycol esterify Polycondensation Polyester can also be made into engineered polyester plastic, and can also be made plasticizer The raw materials and Dye intermediates。