Method to reduce carboxybenzaldehyde isomers in terephthalic...

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

C - Chemistry, Metallurgy

07

C

C07C 51/43 (2006.01) C07C 51/235 (2006.01) C07C 51/42 (2006.01) C07C 63/24 (2006.01) C07C 63/26 (2006.01)

Patent

CA 2335231

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.

L'invention concerne un procédé permettant de réduire les isomères de carboxybenzaldéhyde dans l'acide téréphtalique (TPA) et/ou isophtalique (IPA) brut. On dissout du TPA ou de l'IPA brut dans du N-méthyl-pyrrolidone puis est on le met en contact avec un oxydant comme par exemple un peroxyde d'hydrogène sensiblement anhydre afin de convertir l'isomère de carboxybenzaldéhyde (4-CBA ou 3-CBA) en TPA ou en IPA dans des conditions de température et de pression modérées.

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