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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.
Application
Purified terephthalic acid (PTA) is used for manufacturing polyethylene terephthalate (PET), polyester fibres, polyamide fibres, films and plasticizers (DOTP).
Specifications
| Parameter | Unit | Values | Testing method ORLEN Laboratorium |
| Appearance | - | white powder | Method No. 122 |
| Acid value, | mg KOH/g | 673 - 677 |
Method No. 130 |
| Ash residue, max. | ppm (m/m) | 4 | Method No. 132 |
| Metal content (Co, Mn, Fe, Ni, Cr), max. | ppm (m/m) | 0.5 | Method No. 118 |
| Iron content, max. | ppm (m/m) | 0.2 | Method No. 118 |
| 4-Carboxybenzaldehyde (4-CBA) content, max. | ppm (m/m) | 15 | Method No. 119 |
| p-Toluic acid (p-TA) content, max. | ppm (m/m) | 150 | Method No. 131 |
| Alkaline transparency T400, min. | % | 97 | Method No. 117 |
| B colour, max. | - | 1.2 | Method No. 128 |
| Delta y value, max. | - | 5 | Method No. 129 |
| Solid particle-size distribution Dp50 (wet-sieving), | μm | 80 - 110 | Method No. 133 |
| Water content, max. | % (m/m) | 0.2 | Method No. 127 |
| Pt-Co colour, max. | - | 10 | Method No. 126 |
Sales contact
Marta Żbikowska
Telephone:
+48 24 256 66 18
+48 665 650 926
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