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• W192361172 abstract "Kraft pulping offers a very efficient lignin removal and the production of fibers with high strength properties. Transforming kraft pulping into biorefinery concepts is, however, very challenging because the hemicelluloses and other carbohydrates are degraded into low molecular weight hydroxylcarboxylic acids which are very difficult to recover as pure substances. Quite recently, we have proposed the concept of multifunctional alkaline cooking which allows the selective removal of short-chain carbohydrates by preand post-treatment processes. In this study aqueous pre-hydrolysis and pre-alkaline extraction was applied to Eucalyptus globulus wood followed by kraft and Soda-AQ pulping of the preextracted wood chips. The results showed that alkaline pre-extraction prior to Soda-AQ pulping largely preserves the pulp yield, while a substantial amount of xylan can be extracted in polymeric form during this pre-step. The resulting unbleached pulp revealed characteristics indicating an alternate use as paper and dissolving pulp. Water pre-hydrolysis prior to kraft or Soda-AQ cooking contributed to a yield increase of approximately 20% relative to carbohydrate yield of dissolving pulp production. The removal of hemicelluloses after alkaline pulping by means of cold caustic extraction (CCE) allows the production of high yield dissolving pulps also equally applicable as paper and dissolving pulps. The resulting xylan-containing lye has been recycled to Soda-AQ pulping contributing to a 2-4% yield increase by xylan-reprecipitation. Alternatively, it has been demonstrated that the CCE-lye can be purified efficiently by ultrafiltration while the rather pure and high molecular weight xylan is concentrated in the retentate for further use. The results indicated that biorefinery concepts can be realized for kraft pulping by adopting the proposed multifunctional alkaline pulping concept." @default.
• W192361172 created "2016-06-24" @default.
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• W192361172 date "2009-01-01" @default.
• W192361172 modified "2023-09-27" @default.
• W192361172 title "A new generation kraft process" @default.
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