METHOD OF PRODUCING SULPHATE PULP FROM MIXTURE OF CHIPS FROM DIFFERENT SPECIES OF WOOD Russian patent published in 2013 - IPC D21C1/00 D21C3/00 

FIELD: textiles, paper.

SUBSTANCE: method for producing sulphate pulp from a mixture of chips from different species of wood includes the use of three batch cookers sequentially interconnected by liquid phases, their loading with a mixture of chips from different species of wood, including wood of larch, pine, spruce, birch, aspen, preliminary two-stage treatment of the mixture with water extraction at the first stage and black liquor at the second, removal of the extract from the cooker, supply to the cooker of cooking liquor, recycling the extract to obtain arabinogalactan. Both extraction treatments are carried out in three cookers interconnected by liquid phases by their sequential filling with each of the liquid phases with the removal of the aqueous extract by its replacement from the cookers by black liquor and the removal of the black liquor by its displacement by the cooking liquor.

EFFECT: alignment of the characteristics of chips from all types of wood and increase in the concentration of arabinogalactan in the aqueous extract.

4 cl, 1 tbl, 3 ex