Abstract
Abstract Methanolysis, followed by GC analysis, was used to determine the amount and composition of sugar units comprising the carbohydrates present in water samples from unbleached and peroxide bleached thermomechanical pulp (TMP). Circulation experiments were carried out in the laboratory to simulate white water system closure in mechanical pulp mills. Water samples from simulated “closed” water systems were fractionated to determine the composition of the neutral and anionic polysaccharides released from the TMP samples. Decreasing fresh water consumption from 100 to 10 m3/t, for both unbleached and peroxide bleached TMP, had little influence on the overall sugar composition of the carbohydrates in the water samples. Alkaline peroxide bleaching resulted in substantial changes in the sugar composition of the carbohydrates comprising the dissolved and colloidal substances (DCS) in the water samples. The polysaccharides released from unbleached TMP were comprised of neutral (88%) and anionic (12%) polysac...
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