FIELD: pulp-and-paper industry. SUBSTANCE: aqueous solution containing at least about 30% chloric acid is mixed with non-oxidizable inorganic acid to form gaseous chlorine dioxide containing less than 10 vol.% chlorine. Wood pulp with consistence at least 15% is brought in contact with gaseous chlorine dioxide with chlorine content less than 3% based of chlorine dioxide weight. EFFECT: improved process parameters. 34 cl, 3 tbl
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