FIELD: production of citric acid. SUBSTANCE: purification of solutions of citric acids is carried out by their treatment with ozone-air mixture. Said process is carried out at 40-70 C within 40-60 min, expense of mentioned above mixture being 2-4 m3/m3 h, concentration of ozone being 10-16 mg/l. Said purification is carried out in column apparatus, yield of thus treated citric acid is increased by 8-14 EFFECT: improves quality of citric acid, decreases loss of desired product, simplifies the process. 3 tbl
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