Method to reduce carboxybenzaldehyde isomers in terephthalic acid or isophthalic acid
作者： Wiston Lamshing , Fu-Ming Lee , Randi Wright Wytcherley
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摘要: A method for reducing carboxybenzaldehyde isomers in crude terephthalic and/or isophthalic acids is described. Crude TPA or IPA dissolved N-methyl pyrrolidone and subsequently contacted with an oxidant, such as substantially anhydrous hydrogen peroxide, to convert the isomer (4-CBA 3-CBA) under moderate temperature pressure conditions.
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