Bleached Kraft Pulp from Pre-Extracted Beech Wood (original) (raw)
Beech chips were pre-extracted with hot water and green liquor prior to kraft pulping. The total pulp yield of green liquor pre-extracted chips equivalent to 10 % wood weight was approximately the same as that from the original chips, while the pulp yield from hot water pre-extracted chips was lower by 4.2 %. Effective alkali charge was reduced by about 3 % in kraft pulping of green liquor pre-extracted chips, and by about 1 % in kraft pulping of hot water pre-extracted chips when compared with original chips. The pulps from pre-extracted chips demonstrated higher oxygen delignification efficiency and bleachability in the sequence D0(EO)D1D2 as in case of reference pulp from original chips. Consumption of chlorine dioxide in bleaching of pulps from hot water pre-extracted chips was lower by about 17 % at 5 % wood weight loss and 20.5 % at 10 % wood weight loss, while in case of pulp from green liquor preextracted chips it was lower only by about 5 % at the same weight loss compared ...
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