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Soda cooking of rapeseed straw
Authors: Hájková Kateřina | Gurung Bijay | Potůček František
Year: 2014
Type of publication: článek ve sborníku
Name of source: Proceedings of the 2nd International Conference on Chemical Technology
Publisher name: Česká společnost průmyslové chemie
Place: Praha
Page from-to: 409-413
Titles:
Language Name Abstract Keywords
cze Nátronová várka řepkové slámy Konvenčním natronovým varným postupem byla připravena natronová buničina ze slámy řepky olejky (ozimá liniová odrůda Labrador). Na základě předběžných experimentů byly vybrány varné podmínky dané hydromodulem 5, zanáškou aktivních alkálií 19 %, dávkou antrachinonu 0,1 % a varnou teplotou 160 °C. Jak pro stonky slámy, tak i pro směs stonků a šešulí klesal celkový výtěžek várky a kappa číslo buničiny s rostoucím H-faktorem. Přídavek antrachinonu do varného louhu se projevil zrychlením delignifikace a snížením množství neprovarů v buničině, zejména v oblasti nižších hodnot H-faktoru. řepková sláma; delignifikace; natronová buničina; antrachinon
eng Soda cooking of rapeseed straw In this paper, the suitability of rapeseed straw for cellulosic fibre production under convectional soda pulping process was examined. Rapeseed straw (Brassica napus L. convar. napus, in our case linie genotype Labrador) was used for the pulping. On the basis of trial pulping experiments, the cooking conditions, when rejects amount was acceptable, were selected. Hence, the batch cooks giving pulps to produce handsheets were performed at a liquor-to-straw ratio of 5:1, an alkali charge of 19 %, an anthraquinone charge of 0.1 %, and a cooking temperature of 160 °C. The pulping results were obtained for stalks of rapeseed straw and for rapeseed straw comprising stalks and valves of siliques. As would be expected, both the total yield and kappa number of pulp drop with increasing H-factor which is directly proportional to cooking time. The addition of anthraquinone to cooking liquor led to a significant decreasing in total yield and kappa number characterizing a degree of delignification of pulp. It is worth mentioning that the presence of anthraquinone had a positive effect on decreasing in amount of rejects, mainly at lower values of H-factor up to 1,500 h. rapeseed straw; delignification; soda pulp; anthraquinone

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