Production of Dissolving-Grade Pulp

  • Pratima Bajpai


Dissolving-grade pulps are commonly used for the production of cellulose derivatives and regenerated cellulose. To obtain products of high quality, these so-called “special” pulps must fulfill certain requirements, such as high cellulose content, low hemicellulose content, a uniform molecular weight distribution, and high cellulose reactivity. Xylan-degrading enzymes have been explored for selective removal of pentosans in preparing dissolving-grade pulp. The complete enzymatic hydrolysis of the hemicellulose in the pulp is difficult to achieve. Even with very high enzyme loadings and prolonged incubation periods, xylan hydrolysis is limited. Nevertheless, xylanase treatment may reduce the chemical loading required during caustic extraction or facilitate xylan extraction from kraft pulps. Xylanase treatment of unbleached pulp appears to be more effective because of the presence of more hemicellulose at this stage is accessible for enzymatic degradation. Alkaline extraction in conjunction with enzyme treatment leads to some improvement of the pulp properties. Enzymatic treatments have been shown to activate cellulose by enhancing cellulose accessibility and reactivity. A monocomponent endoglucanase with a cellulose-binding domain (CBD) has been shown to significantly improve the cellulose reactivity.


Dissolving-grade pulp Enzymes Cellulose reactivity Xylan-degrading enzymes Hemicellulose Xylanase Pentosans Endoglucanase Cellulose-binding domain (CBD) Cellulase Monocomponent endoglucanase 


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© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Pulp and Paper ConsultantKanpurIndia

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