the wood was activated using steam the alkali charge in the cce step could be lowered white liquor was charged so that a concentration of effective alkali was 85 g l at a temperature of 45 u00b0 c for 20 minutes the resulting pulp slurry was dewatered in a press before dilution and treatment in two wash presses and one wash filter in a sequence after washing the properties of the pulp were viscosity 770 ml g brightness 61 9 iso the filtrate after the press was analyzed and the xylan content was 24 3 g l lignin content was 4 6 g l resulting in a xylan lignin ratio of 5 3 1 the weight average molecular weight of xylan was determined to 30 0 kg mol corresponding to a degree of polymerization of 227 since the pulp still contained some hydrosulfide ions after washing chlorine dioxide was charged first and then just after sulfuric acid was charged the da step was performed in a small up flow tower coupled with a larger down flow tower the temperature was 91 u00b0 c chlorine dioxide charge was 21 kg adt and sulfuric acid charge was 24 kg adt about 9 kg of the sulfuric acid charge was used for neutralization and the rest was used as active charge after washing the pulp was treated in an extractions step at 80 u00b0.