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. 2023 Dec 4;28(23):7927.
doi: 10.3390/molecules28237927.

Oxidation Treatments Using Hydrogen Peroxide to Convert Paper-Grade Eucalyptus Kraft Pulp into Dissolving-Grade Pulp

Andrea Vera-Loor  1 , Panagiota Rigou  1 , Gérard Mortha  1 , Nathalie Marlin  1
Affiliations

Oxidation Treatments Using Hydrogen Peroxide to Convert Paper-Grade Eucalyptus Kraft Pulp into Dissolving-Grade Pulp

Andrea Vera-Loor et al. Molecules. .

Abstract

Converting paper-grade bleached Kraft pulp into dissolving pulp using eco-friendly chemicals on-site at the mill is a challenge for the pulp industry. In this study, two oxidation systems are evaluated: the first one is based on the use of hydrogen peroxide at various levels of alkalinity; the second one investigates the use of sodium periodate followed by hydrogen peroxide to convert aldehydes into carboxyls and enhance their hemicelluloses removal. Our results have shown that when using only peroxide, the removal of hemicelluloses was not sufficient to improve the pulp's dissolving ability. Conversely, the periodate-peroxide system proved to be more efficient. Results regarding the pulp purity, solubility, degradation (pulp viscosity and cellulose molecular mass distribution), brightness, and its potential applications were discussed.

Keywords: dissolving pulp; hydrogen peroxide; paper grade pulp; periodate oxidation.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure A1
Figure A1
Intrinsic viscosity (mL/g) measured with and without NaBH4 reduction for 13.5%NaIO4.
Figure A2
Figure A2
Intrinsic viscosity (mL/g) measured with and without NaBH4 reduction for the blank trials.
Figure 1
Figure 1
Periodate oxidation of cellulose.
Figure 2
Figure 2
H2O2 consumption, brightness (%ISO), and intrinsic viscosity (mL/g) after oxidation with 10% NaOH (HW-IVinitial, 496 mL/g and SW-IVinitial, 745 mL/g).
Figure 3
Figure 3
H2O2 consumption, brightness (%ISO), and intrinsic viscosity (mL/g) after oxidation with 2% and 5% NaOH (HW-IVinitial, 496 mL/g and SW-IVinitial, 745 mL/g).
Figure 4
Figure 4
Final pH values after the substrate oxidation using a combination of NaIO4 followed by H2O2 in alkaline medium.
Figure 5
Figure 5
Intrinsic viscosity (mL/g), brightness (%ISO), and H2O2 consumption (%) of CL, SW, and HW after the second oxidation (CL-IVinitial, 695 mL/g; HW-IVinitial, 496 mL/g; and SW-IVinitial, 745 mL/g).
Figure 6
Figure 6
Dissolution during carbanilation of HW and SW treated with E, P, and EP (2% H2O2).
Figure 7
Figure 7
MWD of SW and HW treated with E, P, and EP (2% H2O2).
Figure 8
Figure 8
Dissolution ability during carbanilation monitored with DLS for CL, SW, and HW when using different doses of NaIO4 prior to H2O2 oxidation.
Figure 9
Figure 9
MWD profiles of CL, SW, and HW using different doses of NaIO4 prior to H2O2 oxidation.
Figure 10
Figure 10
Cellulose solubility (%) in the NaOH:urea:water system of the more interesting treatments for SW and HW.
See this image and copyright information in PMC

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