Elemental Chlorine-Free Bleaching of Soda, Kraft, and Sulphite Pulps

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

Elemental Chlorine-Free Bleaching of Soda, Kraft, and Sulphite Pulps

Popis výsledku v původním jazyce

Soda pulp cooked from rapeseed straw was subjected to a four-stage elemental chlorine-free bleaching under laboratory conditions using chloride dioxide, hydrogen peroxide, and peracetic acid as bleaching agents. The alkali extraction enhanced with hydrogen peroxide addition followed the first chlorine dioxide delignification. For comparison, an oxygen-predelignified kraft softwood and sulphite spruce pulps, as well as once-dried kraft softwood pulp were undergone to the same bleaching sequence DEpPPaa. The brightness, zero-span breaking length, and degree of polymerisation were measured for unbleached and bleached pulps. The preliminary results showed that bleachability of soda rapeseed pulp was lower in comparison with kraft softwood pulps and sulphite spruce pulp. The final brightness of 80.0, 84.1, 83.4, and 88.3 % ISO was achieved for soda, once-dried kraft, oxygen-predelignified kraft and sulphite pulps, respectively. However, an increase in brightness was accompanied by a decrease in strength of soda rapeseed pulp fibres. The zero-span breaking length decreased from 4.2 km to 3.4 km for soda pulp, while, for oxygen-predelignified kraft softwood and sulphite pulps, a noticeable decrease in fibre strength was not found.

Název v anglickém jazyce

Elemental Chlorine-Free Bleaching of Soda, Kraft, and Sulphite Pulps

Popis výsledku anglicky

Soda pulp cooked from rapeseed straw was subjected to a four-stage elemental chlorine-free bleaching under laboratory conditions using chloride dioxide, hydrogen peroxide, and peracetic acid as bleaching agents. The alkali extraction enhanced with hydrogen peroxide addition followed the first chlorine dioxide delignification. For comparison, an oxygen-predelignified kraft softwood and sulphite spruce pulps, as well as once-dried kraft softwood pulp were undergone to the same bleaching sequence DEpPPaa. The brightness, zero-span breaking length, and degree of polymerisation were measured for unbleached and bleached pulps. The preliminary results showed that bleachability of soda rapeseed pulp was lower in comparison with kraft softwood pulps and sulphite spruce pulp. The final brightness of 80.0, 84.1, 83.4, and 88.3 % ISO was achieved for soda, once-dried kraft, oxygen-predelignified kraft and sulphite pulps, respectively. However, an increase in brightness was accompanied by a decrease in strength of soda rapeseed pulp fibres. The zero-span breaking length decreased from 4.2 km to 3.4 km for soda pulp, while, for oxygen-predelignified kraft softwood and sulphite pulps, a noticeable 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

2018

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the 6th International Conference on Chemical Technology

ISBN

978-80-86238-77-7

ISSN

2336-8128

e-ISSN

neuvedeno

Počet stran výsledku

6

Strana od-do

407-412

Název nakladatele

Česká společnost průmyslové chemie

Místo vydání

Praha

Místo konání akce

Mikulov

Datum konání akce

16. 4. 2018

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

000461293800076