Title: The relation between carbohydrate composition and softwood kraft pulp yield
Abstract: A large number of kraft pulps has been manufactured with or without additives like anthraquinone, polysulfide or H2S impregnation. Carbohydrate analysis of the pulps showed that the main mechanism for yield increase by additives is increased retention of glucomannan. On the other hand, the retention of cellulose was somewhat affected by the use of anthraquinone and higher kappa number. Xylan yield was constant within experimental error for all the investigated pulps. In the region between 43% and 53% bleached yield, kraft pulp yield can be predicted using a simple analysis of the glucomannan content of the pulp and knowledge of the raw material composition. The prediction error for bleached pulp yield was about ±1.5% on o.d. wood for spruce pulp and ±0.7% on o.d. wood for pine pulp. In a comparison with mass balance data from an actual mill, the prediction error was about ±0.5% on o.d. wood.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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Cited By Count: 5
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