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method for reduction of carboxybenzaldehydisomeren in terephthal or isophthalsu00e4ure
method for reduction of carboxybenzaldehydisomeren in terephthal or isophthalsu00e4ure
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机译:对苯二酚或间苯二酚中羧基苯甲二醛异构体的还原方法 u00e4ure
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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 is dissolved in N-methyl pyrrolidone and is subsequently contacted with an oxidant, such as substantially anhydrous hydrogen peroxide, to convert the carboxybenzaldehyde isomer (4-CBA or 3-CBA) to TPA or IPA under moderate temperature and pressure conditions.
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