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Dithionite impregna...
Dithionite impregnation combined with mild steam explosion of spruce wood – an improved version of kraft pulping
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- Wang, Yan (författare)
- KTH,Träkemi och massateknologi,Wallenberg Wood Science Center
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- Jedvert, Kerstin (författare)
- Chalmers University of Technology
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- Lindström, Mikael E. (författare)
- KTH,Träkemi och massateknologi
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visa fler...
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- Theliander, Hans (författare)
- Chalmers University of Technology
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- Henriksson, Gunnar (författare)
- KTH,Träkemi och massateknologi
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visa färre...
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(creator_code:org_t)
- Engelska.
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- Norway spruce (Picea abies) wood chips were impregnated with water or sodium dithionite (Na2S2O4) and were subsequently subjected to a mild steam explosion (STEX) treatment at four or seven bar for ten minutes. In order to evaluate the combined effect of Na2S2O4 and STEX, kraft cooking was performed on samples pre-treated with different combinations of impregnation and STEX. Carbohydrate composition, Klason lignin content, kappa number, intrinsic viscosity, pulp yield, brightness and tensile strength (on pulp sheets) were tested and compared. The results showed that an impregnation with Na2S2O4 combined with mild STEX had a good effect on the delignification during kraft pulping, shown by lower kappa numbers and lower Klason lignin content. The viscosity of the pulp samples of Na2S2O4 plus STEX was lower than the water impregnated and non-STEX pulps. However, the lower viscosity did not influence the strength of the pulp since the tensile index was still high. The Na2S2O4 plus STEX pulp sheets also showed the highest brightness value.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Polymerteknologi (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Polymer Technologies (hsv//eng)
Nyckelord
- sodium dithionite
- mild steam explosion
- kraft pulping
- peeling
- enhanced delignification
- Fiber- och polymervetenskap
- Fibre and Polymer Science
Publikations- och innehållstyp
- pop (ämneskategori)
- ovr (ämneskategori)