Process for the preparation of hydroxyarylglyoxylic acids and their alkali salts, and their use in the preparation of sodium-para-hydroxyphenyl glyoxylate

摘要

the invention relates to a process for the manufacture of hydroxyarylglycoxyliques acids from hydroxyarylglycoliques acid by catalytic oxidation in aqueous alkali.at a ph of greater than or equal to 1