Alkaline and alkaline/oxidation pre-treatments of spruce wood (Picea abies)--impact on the quality of kraft pulp.
A comparable series of specimens from spruce wood were pre-treated with sodium hydroxide, sodium hydroxide and hydrogen peroxide, or per-acetic acid sequences. The pre-treatments reduced the yield of pulps and their Kappa number noticeably, diminished the degree of polymerization moderately, and increased their brightness. One-step peroxide bleaching of pulps from the pre-treated spruce wood resulted in their higher brightness compared to bleached pulp from sound wood. From the viewpoint of improved properties of pulp, the most efficient were the sodium hydroxide/per-acetic acid and per-acetic acid/sodium hydroxide sequences. The pre-treatments did not influence mechanical strength of the obtained pulps significantly.
Solár
R
R
Department of Chemistry and Chemical Technologies, Faculty of wood Science and Technology, Technical University in Zvolen.T.G. Masaryka 24, 960 53 Zvolen, Slovak Republic. rsolar@centrum.sk
Dibdiaková
J
J
Mamoň
M
M
Kačík
F
F
Rázgová
Z
Z
Vacek
V
V
Sivák
J
J
Gaff
M
M
D018533:Biomass; D005227:Fatty Acids / Q000032:analysis; D039821:Monoterpenes / Q000032:analysis; D010084:Oxidation-Reduction / Q000187:drug effects; D010209:Paper / Q000592:standards*; D028222:Picea / Q000187:drug effects*; D010936:Plant Extracts; D058105:Polymerization / Q000187:drug effects; D012972:Sodium Hydroxide / Q000494:pharmacology*; D013057:Spectrum Analysis; D013261:Sterols / Q000032:analysis; D014280:Triglycerides / Q000032:analysis; D014867:Water / Q000737:chemistry; D014934:Wood / Q000187:drug effects*
D005227:Fatty Acids; D039821:Monoterpenes; D010936:Plant Extracts; D013261:Sterols; D014280:Triglycerides; D014867:Water; D012972:Sodium Hydroxide