FIELD: cookers for digestion of fibrous materials. SUBSTANCE: vertical cooker has at least one sorting device with at least one sorting member whose principal configuration is angular one, preferably rectangular. The most referable shape of sorting member is square. Total area of face side of sorting member is less than 1 sq.m. Sorting member is connected with cooler wall so as to create sealed space to which and from which liquid is supplied and withdrawn only through face side of sorting member. EFFECT: provision of uniform temperature level in the entire volume of cooker and intensive delignification at comparatively low temperature. 10 cl, 11 dwg
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