PRODUCTION OF CARBOXYLIC ACID OXIDIZED TO TWO OR MORE OXIDATION NUMBER FROM CARBOHYDRATE, CARBOHYDRATE DERIVATIVE OR PRIMARY ALCOHOL AND APPARATUS THEREFOR

摘要

In preparation of di- and higher-oxidised carboxylic acids or carbohydrates, carbohydrate derivatives or prim. alcohols, a 0.1-60% aqueous solution of the carbohydrate (or derivative), prim. alcohol or mono-oxidised derivative of these is oxidised with oxygen or a gas containing oxygen, on a noble metal or mixed metal catalyst, the stream of products is fed to one or more electrodialysis stages in series, and the di- or higher-oxidised carboxylic acids and removed and recovered there.