| 摘要 |
PURPOSE:To obtain the aimed compound in high selectivity and simply in producing glyoxylic acid by oxidizing glyoxal with hydrogen peroxide in the presence of ferrous ion, by using the raw material from which liberated molecular oxygen is removed to suppress side reactions. CONSTITUTION:In producing glyoxylic acid useful as an intermediate for various chemicals such as drug modulator, cosmetic, perfume, agricultural chemicals, etc., by oxidizing glyoxal with hydrogen peroxide as an oxidizing agent in the presence of ferrous ion such as ferrous sulfate, etc., liberated molecular oxygen dissolved in the raw material or in the oxidizing agent is preremoved and the reaction is carried out to suppress formation of formic acid and oxalic acid as by-products and to raise selectivity of the aimed compound. Since the reaction is carried out at a relatively low temperature of about 0-30 deg.C, preferably about 0-15 deg.C, no organic highly coloring component is produced. Consequently, a high-quality aqueous solution containing the aimed compound is simply obtained. |
