CAS: 100-21-0
Terephthalic acid is the organic compound with formula C6H4(COOH)2. This colourless solid is a commodity chemical, used principally as a precursor to the polyester PET, used to make clothing and plastic bottles. Several million tones are produced annually. It is one of three isomeric phthalic acids.
Application
· PTA is mainly used in the production of polyester products, including polyethylene terphthalate (PET), follows reaction with glycol, reagent for alkali in wool and an additive to poultry feeds.
| Item | Top grades | First grade | |
|---|---|---|---|
| Appearance | White powder | White powder | |
| Acid value /(mgKOH/g) | 675±2 | 675±2 | |
| P-Carboxybenzaldehyde/(mg/Kg) | ≤25 | ≤25 | |
| p-methylbenzaldehyde /(mg/Kg) | ≤150 | ≤180 | |
| Ignition residue/(mg/Kg) | ≤6 | ≤10 | |
| Total heavy metal (Mo,Cr, Ni, Co, Mn,Fe )/(mg/Kg) | ≤3 | ≤5 | |
| Fe/(mg/Kg) | ≤1 | ≤2 | |
| moisture W/% | ≤0.2 | ≤0.2 | |
| DMF tinct(5g/100ml)/Hazen unit | ≤10 | ≤10 | |
| (Platinum cobalt color number) | |||
| b*value | ≤1.4 | ≤1.5 | |
| Particle size distribution | 250μm W/% | 7.9 | 7.9 |
| 45μm W/% | 10.2 | 10.2 | |
| average grain diameter/μm(sieve method) | 128 | 128 | |
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