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Upgrading of paper grade pulps to dissolving pulps by nitren extraction: yields, molecular and supramolecular structures of nitren extracted pulps

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Abstract

Different paper grade pulps were extracted with nitren in order to produce dissolving pulps and polymeric xylan. The yield and molecular structure of the extracted pulps were investigated by carbohydrate analysis and HPSEC combined with fluorescence labelling in order to additionally monitor the carbonyl and carboxyl group profiles of the pulps. The supramolecular structure of selected pulps were further studied by solid state 13C-CP/MAS-NMR and wide-angle X-ray scattering (WAXS). These supramolecular data of nitren extracted pulps were compared to samples extracted with NaOH and a conventional dissolving pulp in order to classify the properties of nitren extracted pulps. Nitren extraction results in selective xylan removal without noticeable degradation or oxidation of the cellulose fraction. The resulting dissolving pulps have high molar masses, a narrow molar mass distribution and the typical contents of carbonyl and carboxyl groups. The supramolecular structure of cellulose is less affected by nitren compared to strong NaOH, and the resultant dissolving pulps still have the cellulose I structure.

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Acknowledgments

Financial support for this research was provided by AiF (German Federation of Industrial Research Associations “Otto von Guericke” e.V., AIF project 13892N). The support of COST E41 for a short term scientific mission of Ron Janzon to the BOKU is gratefully acknowledged. The authors thank Jürgen Kunze from Fraunhofer IAP Potsdam for the 13C-NMR measurements.

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Authors and Affiliations

  1. vTI, Institute of Wood Technology and Wood Biology, 21031, Hamburg, Germany

    Ron Janzon, Jürgen Puls & Bodo Saake

  2. Fraunhofer Institute for Applied Polymer Science, 14406, Potsdam, Germany

    Andreas Bohn

  3. Department of Chemistry, University of Natural Resources and Applied Life Sciences, 1190, Vienna, Austria

    Antje Potthast

Authors
  1. Ron Janzon
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  2. Jürgen Puls
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  3. Andreas Bohn
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  4. Antje Potthast
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  5. Bodo Saake
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Correspondence to Bodo Saake.

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All laboratories are members of the European polysaccharide network of excellence EPNOE.

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Janzon, R., Puls, J., Bohn, A. et al. Upgrading of paper grade pulps to dissolving pulps by nitren extraction: yields, molecular and supramolecular structures of nitren extracted pulps. Cellulose 15, 739–750 (2008). https://doi.org/10.1007/s10570-008-9224-6

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