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Upgrading Softwood Paper Pulp to Dissolving Pulp quality
Dept of Fiber and Polymer Technology, Div. of Wood Chemistry and Pulp Technology
Upgrading Softwood Paper Pulp to Dissolving
To develop an industrially cost effective post-bleaching treatment sequence for SW paper pulp to reach dissolving pulp quality
Dissolving-grade pulps, which are pulps with high cellulose content, low hemicellulose content, high cellulose reactivity and high homogeneity, are commonly used for the production of cellulose derivatives and regenerated cellulose. These pulps are mainly produced by the sulphite and the prehydrolysis kraft process in order to fulfil these specific requirements. However, the costs of them are higher than those for common paper-kraft pulps.
Enzymatic pretreatment with monocomponent endoglucanase of dissolving pulp for the viscose process has shown improved accessibility and reactivity. Recently, it has been demonstrated that a combination of enzymatic and chemical pretreatments makes suitable the utilization of paper-grade pulps as dissolving-grade pulps. Moreover, a further optimization of these sequences is required. Besides, the viability of obtaining different products, e.g. viscose, from these “modified” pulps must be assayed.
This work, thus, will focus on the feasibility of modifying paper-grade pulps made from spruce, to obtain dissolving-grade pulps with similar characteristics of commercial pulps by optimizing different sequences of treatments, developing new operating condition and testing these pulps for the production of cellulose derivatives and regenerated cellulose.
This thesis work will be performed in close cooperation with an industrial partner
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