FIELD: pulp-and-paper industry. SUBSTANCE: method involves pouring black liquor onto raw wood material; treating with liquid comprising active lignin-solving components, with concentration of active components in liquid being successively increased. Raw wood material is preliminarily subjected to hydrolysis. When black liquor is poured, it is neutralized with sulfuric acid. EFFECT: reduced consumption of chemicals, improved ecology and reduced power consumption. 2 cl, 2 dwg, 2 ex
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