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Soda Pulping of Rapeseed Straw
Authors: Potůček František | Gurung Bijay | Hájková Kateřina
Year: 2014
Type of publication: článek v odborném periodiku
Name of source: Cellulose Chemistry and Technology
Publisher name: Editura Academiei Romane
Place: Bukurešť
Page from-to: 683-691
Titles:
Language Name Abstract Keywords
cze Nátronová várka řepkové slámy Cílem práce bylo uskutečnit diskontinuální natronové várky slámy řepky olejky. Stanoveno bylo chemické složení slámy (celulóza, hemicelulózy, lignin, popel a extrahovatelné látky). Vyšetřován byl vliv přítomnosti antrachinonu ve varném louhu na stupeň delignifikace, celkový výtěžek buničiny a zastoupení neprovarů v ní. U vybraných vzorků buničiny byly stanoveny délka vláken stupeň polymerace a pevnostní vlastnosti. Přítomnost antrachinonu ve varném louhu urychlila delignifikaci a vedla ke snížení neprovarů v uvařené buničině. řepková sláma; delignifikace; natronová buničina; výtěžek; antrachinon
eng Soda Pulping of Rapeseed Straw The aim of this work was to conduct batch soda pulping of rapeseed straw (species Brassica napus L. convar. napus) without and with addition of anthraquinone as a catalyst in the cooking liquor. To characterize the chemical composition of rapeseed straw, cellulose, holocellulose, lignin, ash, and extractives were determined. The effect of anthraquinone addition upon the degree of delignification, total yield, and amounts of rejects was investigated. For selected samples of pulp, the fibre length, degree of polymerization, as well as strength properties of soda and soda-AQ pulps were measured as well. The results obtained showed that the content of lignin in rapeseed straw is lower than that in softwoods. The presence of anthraquinone in cooking liquor accelerates delignification, however, for a given H-factor, lower kappa number and total yield were achieved, compared with cooking without anthraquinone. Also, anthraquinone in cooking liquor had a positive effect upon the decrease of rejects, mainly at a lower H-factor. The unbleached soda pulp comprising short fibres, below 1 mm, presented greater tensile strength in comparison with waste paper. rapeseed straw; delignification; soda pulp; yield; anthraquinone

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