pulp refining method cellulosic bleaching or extraction in which the pulp having a consistency of 10-65%, and finely divided is being treated with chemicals at a temperature of 10 to 250 C. The finely divided pulp and products impregnated chemical passes continuously with a consistency of 30 to 65% in a treatment apparatus in which reigns a pressure of 5 400 kPa and that the atmosphere consists substantially of vapor having a lower oxygen content was 1% by volume, has a temperature 100 to 150 C. the paste flows quickly, but without the features of the fiber are corrupt, continuously through the processing apparatus with a substantially turbulent flow and substantially unchanged solids content. The chemicals impregnated in the dough are forced to react in such a manner so full with it during its rapid movement through the treatment apparatus, they are virtually consumed when traffic movement ends. The dough is then discharged from the treatment apparatus and dried, other chemical treatment phases may take place before drying.
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