FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing crystalline glyoxalic acid. Method is carried out by concentration of aqueous solution of glyoxalic acid with mass concentration of 50 % on a rotary evaporator at residual pressure of 15 mbar and temperature of 40 °C to weight concentration of glyoxalic acid 80–87 %. Then the solution is diluted with water to mass concentration of glyoxalic acid of 77–80 % and left at room temperature for 5 days.
EFFECT: improved method of producing crystalline glyoxalic acid.
1 cl, 1 ex
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