The yield and composition of cellulosic products obtained from birch wood by peroxide catalytic delignification, integrated with an acidic prehydrolysis of wood and alkali treatment of cellulosic product were compared. Catalysts H₂SO₄ and TiO₂ were used in peroxide delignification of birch wood.

The maximum yield of cellulosic product (66% mass.) was obtained by wood delignification in the medium "hydrogen peroxide – acetic acid – water – catalyst TiO₂" at 100°C. This cellulosic product contains 72.3% mass. of cellulose, 20.2% mass. of hemicelluloses and 2.9% mass. of lignin. Cellulosic products, containing 93,1–95,5 % mass. of cellulose,  1.7-2.5 % mass. of hemicelluloses and less than 1% mass. of lignin are obtained in two ways. One of them includes the additional treatment of cellulosic product with 18% NaOH at 100°C, and the other – prehydrolysis of wood with 3% H₂SO₄ at 100°C and alkali treatment of the cellulosic product. From cellulosic products with the low content of lignin and hemicelluloses the glucose hydrolysates with a low concentration of impurities, inhibiting the enzymatic synthesis of bioethanol can be obtained.