Discriminating the brightness stability of cellulosic pulp in relation to the final bleaching stage
作者： Pedro EG Loureiro , M Rosário M Domingues , António JS Fernandes , M Graça VS Carvalho , Dmitry V Evtuguin
DOI: 10.1016/J.CARBPOL.2012.01.024
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摘要: Abstract The reasons for the improved brightness stability of pulp bleached in final stage with hydrogen peroxide than chlorine dioxide have been studied. UV–vis Diffuse Reflectance and UV Resonance Raman micro-spectroscopy @ 325 nm were employed to evaluate chromophores formation/degradation fully eucalypt kraft while applying a or bleaching stages. Spectroscopic data coupled wet chemistry mass spectrometry analyses degradation products arisen during hydrothermal ageing pulps. complementary revealed important role partially oxidised carbohydrates residual xylan–lignin complex reactions. leaching from stage, rather specific oxidation patterns polysaccharides agent was suggested be crucial factor predetermining extent reversion pulp.
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