YellowРYellowРBP CONFIDENTIALРYellow-Colored Byproducts?in Medium-Purity TAР2,6-Dicarboxyanthraquinone?(DCAQ)Р2,6-Dicarboxyfluorenone?(DCF)РBP CONFIDENTIALРPET Degradation MechanismРReferences:?E. P. Goodings, Soc. Chem. Ind. (London) Monograph No. 13, 211 (1961) ?L. H. Buxbaum, Angew. Chem. Internat. Edit., 7, 182 (1968)РBP CONFIDENTIALРProposed Mechanism for PET?Color FormationРReference: E. P. Goodings, Soc. Chem. Ind. (London) Monograph No. 13, 211 (1961)РBP CONFIDENTIALРReactions of 4-CBA?Formation of PolyenealdehydesРPolyenealdehyde Absorbance MaximumАn = 0 255 nmАn = 1 292 nmАn = 2 317 nmАn = 3 343 nmРBP CONFIDENTIALРBP CONFIDENTIALРBP CONFIDENTIALРConclusions: ?(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
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