Terephthalic acid (100-21-0)
Basic Information
Chemical Name: Purified Terephthalic Acid
Chinese Aliases: High-purity Terephthalic Acid; PTA; Refined Terephthalic Acid
English Name: Purified Terephthalic Acid
Molecular Formula: C₈H₆O₄
Molecular Weight: 166.13
CAS Number: 100-21-0
Appearance: White crystalline powder or granular solid, odorless, free-flowing, insoluble in water, slightly soluble in alcohols and ethers.
Technical Parameters
Item | Standard
-------------|----------------
Grade | Superior | First Grade
Appearance | White powder
Acid Value (as KOH)/(mg/g) | 675±2
p-Carboxybenzaldehyde/(mg/kg) | 25
p-Methylbenzoic Acid/(mg/kg) | 150 | 180
Ash Content/(mg/kg) ≤ | 6 | 10
Total Heavy Metals (Mo, Cr, Ni, Co, Mn, Ti, Fe)/(mg/kg) ≤ | 3 | 5
Iron/(mg/kg) ≤ | 1 | 2
Moisture w/% ≤ | 0.2
DMF Color (5 g/100 mL)/Hazen Units (Pt-Co) ≤ | 10
b* Value | As agreed between supplier and buyer
Particle Size Distribution
>250 μm, φ/%
<45 μm, φ/%
Average Particle Size/μm | As agreed between supplier and buyer
or
>250 μm, w/%
<45 μm, w/%
Average Particle Size/μm | As agreed between supplier and buyer
(The above parameters are for reference only; the actual values are subject to the factory inspection report.)
Packaging Specification
Standard packaging is 500 kg or 1000 kg jumbo bags, with 25 kg small bags available on request.