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Use of chlorine dio...
Use of chlorine dioxide and ozone in combination in prebleaching
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Toven, K. (författare)
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- Gellerstedt, Göran (författare)
- KTH,Pappers- och massateknik
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Kleppe, R. (författare)
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visa fler...
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Moe, S. (författare)
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visa färre...
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(creator_code:org_t)
- 2002
- 2002
- Engelska.
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Ingår i: Journal of Pulp and Paper Science (JPPS). - 0826-6220. ; 28:9, s. 305-310
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- (DZ)Eo prebleaching of oxygen-delignified softwood kraft pulp gave a synergistic delignification effect compared to the effect of chlorine dioxide and ozone Separately, and the (DZ)Eo process was somewhat better than (ZD)Eo prebleaching in terms of delignification. The solubilization of the lignin in chlorine dioxide and ozone bleaching seems to be governed by the large number of carboxyl groups introduced into the lignin structure. The efficient delignification obtained in (DZ)Eo prebleaching may be explained by the ability of chlorine dioxide and ozone to degrade different Apes of lignin structures. Whereas chlorine dioxide mainly degrades phenolic lignin structures, ozone is capable of degrading both phenolic and non-phenolic lignin structures. The (DZ) treatment initially allows chlorine dioxide to degrade the phenolic lignin structures, and leaves the non-phenolic and less reactive lignin structures for the ozone treatment.
Nyckelord
- pretreatment
- kraft pulps
- softwood pulps
- oxygen
- delignification
- bleached pulps
- chlorine dioxide
- ozone
- performance evaluation
- phenolic hydroxyl-groups
- hexeneuronic acid groups
- residual lignin
- bleaching sequence
- structural-changes
- kraft cooking
- wood
- pulp
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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