Production de cellulose pure à partir de bois par un procédé d’épuration et de blanchiment propre à base d’ozone, en vue d’une valorisation textile ou chimique

Abstract : Bleaching of wood pulp is still an environmental issue. A new ozone-based TCF bleaching sequence made it possible to produce a bleached dissolving pulp whose properties were comparable to those of a pulp bleached with a conventional bleaching sequence using chlorine dioxide (ECF). It was noticed that the TCF bleached pulp had better brightness stability. The origin of yellowing is still poorly understood. It was studied here by the implementation of several analytical methods including EPR spectroscopy, UVRaman spectroscopy and also fluorescence spectroscopy for the specific analysis of carbonyl and carboxyl groups. It was shown that the carbonyl groups present on the cellulose are detrimental to the brightness stability, both during accelerated ageing and mercerization. They can be partly eliminated by an alkaline treatment, which improves the brightness stability. Addition of hydrogen peroxide allows for a further increase of the brightness stability, but without any extra carbonyl removal. It would have an effect on some conjugated residual chromophores, mainly quinones, involved in the yellowing mechanism. The TCF pulp would possess less quinones than a ECF pulp.
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Jordan Perrin. Production de cellulose pure à partir de bois par un procédé d’épuration et de blanchiment propre à base d’ozone, en vue d’une valorisation textile ou chimique. Génie des procédés. Université Grenoble Alpes, 2016. Français. ⟨NNT : 2016GREAI088⟩. ⟨tel-01689744⟩

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