Summary
High-yield pulps have been obtained by means of steam explosion pulping. This process was carried out as follows: 1) chips soak impregnation (60 °C, 24 h, L/C = 6) in solutions containing 8% Na2SO3 and a variable concentration of either Na2CO3 or NaHCO3, ranging from 0 to 2%; 2) cooking at high temperature (190–200 °C) for short time (2-1 min); 3) rapid pressure release. This work shows that mechanical properties were substantially improved when adding a second chemical to the Na2SO3 impregnation solution. Moreover, refining energy requirement was significantly reduced. However, the higher chemical charge used made the optical properties drop. In this paper, mathematical models have been proposed in order to accurately predict specific refining energy and paper properties from sulfonate content and pulp yield. In addition, the relative importance of these two parameters has been studied.
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Thanks are due to the Natural Science and Engineering Council of Canada (NSERC) and Fonds pour la Formation de chercheurs et l'aide à la recherche of Quebec (FCAR) for their financial support.
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Carrasco, F., Kokta, B.V., Ahmed, A. et al. High-yield pulping of aspen wood: Relation between pulp properties and fibre characteristics by multiple linear regression. Wood Sci.Technol. 28, 409–421 (1994). https://doi.org/10.1007/BF00225460
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DOI: https://doi.org/10.1007/BF00225460