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Purified terephthalic acid PTA

Crude terephthalic acid (CTA) is obtained by catalytic oxidation of paraxylene with oxygen contained in compressed air. In the next step, purified terephthalic acid PTA is obtained by catalytic hydrogenation of impurities contained in CTA.


Purified terephthalic acid (PTA) is used for manufacturing polyethylene terephthalate (PET), polyester fibres, polyamide fibres, films and plasticizers (DOTP).


Parameter Unit Values Testing method ORLEN Laboratorium
Appearance - white powder Method nr 122
Acid value, mg KOH/g od 673 do 677 Method nr 130
Ash residue, max. ppm (m/m) 4 Method nr 132
Metal content (Co, Mn, Fe, Ni, Cr), max. ppm (m/m) 0.5 Method nr 118
Iron content, max. ppm (m/m) 0.2 Method nr 118
4-Carboxybenzaldehyde (4-CBA) content, max. ppm (m/m) 15 Method nr 119
p-Toluic acid (p-TA) content, max. ppm (m/m) 150 Method nr 131
Alkaline transparency T400, min. % 97 Method nr 117
B colour, max. - 1.2 Method nr 128
Delta y value, max. - 5 Method nr 129
Solid particle-size distribution Dp50 (wet-sieving), μm 95 ± 15 Method nr 133
Water content, max. % (m/m) 0.2 Method nr 127
Pt-Co colour, max. APHA 10 Method nr 126

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