Chlorine Dioxide Bleaching of Soda Rapeseed Pulp

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Chlorine Dioxide Bleaching of Soda Rapeseed Pulp

Popis výsledku v původním jazyce

Soda pulp cooked from rapeseed straw (Brassica napus L. convar. napus, winter line genotype Labrador) was subjected to a four-stage elemental chlorine-free bleaching under laboratory conditions. The bleaching sequence comprised three chlorine dioxide stages. The alkali extraction enhanced with hydrogen peroxide addition followed the first chlorine dioxide delignification. For comparison, kraft pulp cooked from a blend of spruce and pine was subjected to the same bleaching sequence D0EPD1D2. After each bleaching step, the optical and strength properties were measured. The preliminary results showed that bleachability of soda rapeseed pulp was lower in comparison with kraft softwood pulp for D0EPD1P bleaching sequence. The final brightness of 83.5 % ISO and 87.8 % ISO was achieved for soda and kraft pulps, respectively. However, the bleaching had a negative impact on the strength of soda rapeseed fibres. The zero-span breaking length decreased from 4.0 km to 3.3 km for unbleached and bleached soda pulps, respectively, while, for kraft softwood pulp, a decrease in fibre strength was not found.

Název v anglickém jazyce

Chlorine Dioxide Bleaching of Soda Rapeseed Pulp

Popis výsledku anglicky

Soda pulp cooked from rapeseed straw (Brassica napus L. convar. napus, winter line genotype Labrador) was subjected to a four-stage elemental chlorine-free bleaching under laboratory conditions. The bleaching sequence comprised three chlorine dioxide stages. The alkali extraction enhanced with hydrogen peroxide addition followed the first chlorine dioxide delignification. For comparison, kraft pulp cooked from a blend of spruce and pine was subjected to the same bleaching sequence D0EPD1D2. After each bleaching step, the optical and strength properties were measured. The preliminary results showed that bleachability of soda rapeseed pulp was lower in comparison with kraft softwood pulp for D0EPD1P bleaching sequence. The final brightness of 83.5 % ISO and 87.8 % ISO was achieved for soda and kraft pulps, respectively. However, the bleaching had a negative impact on the strength of soda rapeseed fibres. The zero-span breaking length decreased from 4.0 km to 3.3 km for unbleached and bleached soda pulps, respectively, while, for kraft softwood pulp, a decrease in fibre strength was not found.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20502 - Paper and wood

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 5th International Conference on Chemical Technology

ISBN

978-80-86238-65-4

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

6

Strana od-do

"470 – 475"

Název nakladatele

Česká společnost průmyslové chemie

Místo vydání

Praha

Místo konání akce

Mikulov

Datum konání akce

10. 4. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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