PRODUCTION METHOD OF SULPHITE PULP OF MIXTURE OF DIFFERENT WOOD SPECIES CHIPS Russian patent published in 2013 - IPC D21C3/06 

FIELD: woodworking industry.

SUBSTANCE: method includes the use of three batch cookers sequentially interconnected by liquid-phases, loading them with a mixture of chips of different species of wood, including wood of larch, pine, spruce, birch, aspen, preliminary two-stage treatment of the mixture of chips with the aqueous medium at elevated temperature at the first stage to produce an extract and with the hot solution of lignosulphonates at the second stage by successive filling the cookers with the aqueous medium, the solution of lignosulphonates and cooking liquor and discharge from the cookers of the aqueous medium by its displacement with the solution of lignosulphonates, the discharge of this solution by its displacement with the cooking liquor. The aqueous extract discharged from the process is used for production of arabinogalactan and flavonoids. Pulp cooking is carried out by bisulfite method.

EFFECT: improvement of pulp quality, simplification of processing the extract to obtain arabinogalactan and flavonoids due to their increase in the extract.

7 cl, 2 tbl