FIELD: cellulose industry. SUBSTANCE: cellulose suspension is treated successively with nitrogen-containing carboxylic acid at pH 3.1-9.0 at 10-100 C, washed with water and treated with peroxide-containing compound followed by treatment with halogen-containing compound, and spent lye from this step is recirculated to the one of preceding stages. Chlorine dioxide is used as a source of halogen-containing compound and diethylenetriaminepentaacetic acid or ethylenediaminetetraacetic acid were used as a source of nitrogen-containing polycarboxylic acid. EFFECT: improved method of cellulose whitening. 5 cl, 7 tbl
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