Method to reduce carboxybenzaldehyde isomers in terephthalic aci

Details Method to reduce carboxybenzaldehyde isomers in terephthalic aci Method to reduce carboxybenzaldehyde isomers in terephthalic aci

1998-06-16

1999-07-27

Barts, Samuel

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C07C 51487

Patent

active

059292741

ABSTRACT:
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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