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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00002767naa a2200433 4500
001oai:DiVA.org:kth-5372
003SwePub
008060214s2004 | |||||||||||000 ||eng|
024a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-53722 URI
024a https://doi.org/10.1016/j.crvi.2004.03.0112 DOI
040 a (SwePub)kth
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
100a Gellerstedt, Göranu KTH,Fiber- och polymerteknologi4 aut0 (Swepub:kth)u1pqzekk
2451 0a Towards a new concept of lignin condensation in kraft pulping. Initial results
264 1b Elsevier BV,c 2004
338 a print2 rdacarrier
500 a QC 20101004
520 a In kraft pulping, a comparatively large amount of lignin remains in the fibres after the cook. Based on various analytical techniques for lignin, such as thioacidolysis, GPC and NMR, it is suggested that lignin condensation reactions take place during the cook. The reaction seems, however, not to involve ionic intermediates as has been suggested previously but rather a one-electron mechanism with elemental sulphur as the initiator. Support for such a reaction has been found through kraft cooks in the presence of an added phenol, 2,6-xylenol, as well as through NMR analysis of kraft lignin. It was found that the added phenol is incorporated in the pulp lignin with linkages indicative of radical coupling. Furthermore, kraft lignin was found to contain substantial amounts of chemically linked fatty acids. By complementary analyses of sulphur and polysulphide in an industrial black liquor, the presence of these compounds throughout a kraft cook was demonstrated.
650 7a TEKNIK OCH TEKNOLOGIERx Materialteknikx Pappers-, massa- och fiberteknik0 (SwePub)205032 hsv//swe
650 7a ENGINEERING AND TECHNOLOGYx Materials Engineeringx Paper, Pulp and Fiber Technology0 (SwePub)205032 hsv//eng
653 a Condensation
653 a Electron transfer reactions
653 a Fatty acids
653 a GPC
653 a Kraft pulping
653 a NMR analysis
653 a Phenols
653 a Thioacidolysis
653 a Cellulose and paper engineering
653 a Cellulosa- och pappersteknik
700a Majtnerová, Andreau KTH,Fiber- och polymerteknologi4 aut0 (Swepub:kth)u1qmwtl6
700a Zhang, Limingu KTH,Fiber- och polymerteknologi4 aut0 (Swepub:kth)u16k1pmb
710a KTHb Fiber- och polymerteknologi4 org
773t Comptes rendus. Biologiesd : Elsevier BVg 327:9-10, s. 817-826q 327:9-10<817-826x 1631-0691x 1768-3238
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-5372
8564 8u https://doi.org/10.1016/j.crvi.2004.03.011

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