FIELD: chemical technology, wood treatment. SUBSTANCE: invention relates to delignification of lignocellulose mass with oxygen taken at mean concentration. Prolonged delignification is carried out by maintenance of temperature at the first stage below 90 C and at temperature difference between stages less 20 C. Pressure at the first stage is 4-10 bars, at the second stage - 2-5 bars. Amount of oxygen added at the first stage is 25-50 kg/t of cellulose. Alkali is added at the first stage only to obtain high alkalinity in cellulose mass (25-50 kg of alkali/t of cellulose). Treatment time at the first stage is 10-30 min, at the second stage - 45-180 min. EFFECT: increased yield of cellulose. 4 cl, 1 dwg
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