PTA和QTA、MTA的比较.ppt

Comparison of PTA andMedium-Purity TA Feedstocks Properties of Feedstocks Yellow-Colored Byproductsin Medium-Purity TA PET Degradation Mechanism Proposed Mechanism for PETColor Formation Reactions of 4-CBAFormation of Polyenealdehydes Analysis of Korea Polyester Chip Samples Produced from PTA/MTA/QTA Feedstocks Semi-Dull Chip CharacteristicsEffect of Medium-Purity TA Feedstocks Semi-Dull Chip CharacteristicsEffect of Medium-Purity TA Feedstocks Semi-Dull Chip CharacteristicsEffect of Medium-Purity TA Feedstocks How to Make PET From QTA with Low b* Effect of Medium-Purity TA Feedstocks Contributions to Variability Contributions to PET b*-Value Variability Contributions to PET b*-Value Variability (continued) Comparison of PTA andMedium-Purity TA Feedstocks BP CONFIDENTIAL Effects on PET Properties and PET Color Variability Formation of Colored Byproducts During the PTA Hydrogen Treatment Process Intensely Yellow Intensely Yellow Yellow 2,6-Dicarboxyanthraquinone (DCAQ) 2,6-Dicarboxyfluorenone (DCF) References: E. P. Goodings, Soc. Chem. Ind. (London) Monograph No. 13, 211 (1961) ? L. H. Buxbaum, Angew. Chem. Internat. Edit., 7, 182 (1968) Reference: E. P. Goodings, Soc. Chem. Ind. (London) Monograph No. 13, 211 (1961) ? Polyenealdehyde Absorbance Maximum n = 0 255 nm n = 1 292 nm n = 2 317 nm n = 3 343 nm Conclusions: (1) PTA b* has a direct influence on PET b* (2) PTA with a b* of ~1.0 with low variability is the preferred PET feedstock PURPOSE: To develop a better understanding of the effects of medium-purity TA feedstocks, a variety of PET chip samples that were made from PTA, medium-purity TA and blends were collected from Korean polyester producers. These samples were analyzed at Naperville to investigate whether quality limitations in the downstream exist for PET producers who use the medium-purity TA feedstocks. SAMPLE ID: BR = bright chip used for filament and tire cord end-uses; SBR = used in