FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to method for preparing D-glucuronic acid by heating 1,2-O-isopropylidene-D-glucuronic acid salts in water-containing solution in the presence of acidic agents. Sulfoacid cation-exchange resins are used as acidic agents with exchange capacity 4 mg-eq/g, not less, taken in the amount 0.5 g per 0.001 mole of 1,2-O-isopropylidene-D-glucuronic acid salts, not less. Heating 1,2-O-isopropylidene-D-glucuronic acid salts is carried out at temperature 40-95 C using ethanol aqueous solution with concentration 50%, not above, as a water-containing solution. Salts with alkaline or alkaline-earth metals or ammonium salts are used as 1,2-O-isopropylidene-D-glucuronic acid salts. Invention provides ecological safety of method and improvement of end product purity. EFFECT: improved preparing method. 5 cl, 6 ex
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