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| Pure Terephthalic Acid |
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| Short Name ▶ |
PTA |
| CAS No. ▶ |
100-21-0 |
| UN No. ▶ |
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| Chemical Formula ▶ |
C8h6o4 |
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Item
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Top grades
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First grade
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Appearance
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White powder
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White powder
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Acid value /(mgKOH/g)
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675±2
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675±2
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P-Carboxybenzaldehyde/(mg/Kg)
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≤25
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≤25
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p-methylbenzaldehyde /(mg/Kg)
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≤150
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≤180
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Ignition residue/(mg/Kg)
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≤6
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≤10
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Total heavy metal (Mo,Cr, Ni, Co, Mn,Fe )/(mg/Kg)
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≤3
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≤5
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Fe/(mg/Kg)
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≤1
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≤2
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moisture W/%
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≤0.2
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≤0.2
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DMF tinct(5g/100ml)/Hazen unit
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≤10
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≤10
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(Platinum cobalt color number)
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b*value
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≤1.4
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≤1.5
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Particle size distribution
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250μm W/%
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7.9
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7.9
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45μm W/%
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10.2
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10.2
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average grain diameter/μm(sieve method)
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128
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128
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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.
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