Wood pulp washing 2. Displacement washing of aqueous lignin from model beds with cationic polymer solutions

Cationic poly(diallyldimethylammonium chloride), polyDADMAC, increased the efficiency of the displacement of aqueous kraft lignin from a bed of glass beads. The bed consisted of a cylindrical bed, 5 cm in diameter, of fine (97 μm) glass beads surrounding a center channel, 1.5 cm in diameter, filled with coarse (1200 μm) glass beads. The bed was designed to model the displacement washing characteristics of pulp fiber pads on kraft brownstock …