Changes in sulfite liquor composition while re-profiling mill from paper-grade to dissolving pulp production

Magina, Sandra; Mendes, Inês S. F.; Prates, António; Evtuguin, Dmitry V.

doi:10.1080/02773813.2022.2068603

Journal of Wood Chemistry and Technology

2022

DOI: 10.1080/02773813.2022.2068603

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Changes in sulfite liquor composition while re-profiling mill from paper-grade to dissolving pulp production

Sandra Magina

Inês S. F. Mendes

António Prates

et al.

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Cited by 6 publications

References 28 publications

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Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp

Mendes,

Prates,

Evtuguin

2023

Cellulose

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Xylan is the main contaminant of hardwood sulphite dissolving pulp used for the production of regenerated cellulose. The amount of xylan in pulp should not exceed the minimum allowable values and which is not easy to achieve. To control the pulping process, a basic knowledge of xylan removal is essential. In this study, Eucalyptus globulus glucuronoxylan (GX) conversion during acidic Mg-base acid sulphite pulping of dissolving pulp was assessed for the first time in pilot experiments simulating the industrial process. The kinetics of GX degradation and changes in its structure and molecular weight along all pulping steps were evaluated. According to pentosans analysis, more than 60% of wood xylan was removed already in the heating-up step. A pseudo-first-order reaction for xylan degradation at the final pulping temperature of 140–148 °C was obtained with an activation energy of 133.4 kJ/mol. Removal of residual GX from pulp was hampered by its entrapment in cellulose fibril aggregates. The dynamics of xylan deacetylation and depolymerization during pulping in isolated samples was revealed by 2D NMR and SEC techniques, respectively. Overall, the residual xylan structure in pulp is predetermined by its structural heterogeneity in the cell wall, rather than by structural changes occurring during pulping.

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Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp

Mendes,

Prates,

Evtuguin

2023

Cellulose

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New insights into kinetics and mechanisms of acid sulphite delignification of Eucalyptus globulus wood

Mendes,

Prates,

Evtuguin

2024

Chemical Engineering Journal

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Chemical composition and structural features of cellolignin from steam explosion followed by enzymatic hydrolysis of Eucalyptus globulus bark

Magina,

Marques,

Gírio

et al. 2024

Industrial Crops and Products

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Changes in sulfite liquor composition while re-profiling mill from paper-grade to dissolving pulp production

Cited by 6 publications

References 28 publications

Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp

Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp

New insights into kinetics and mechanisms of acid sulphite delignification of Eucalyptus globulus wood

Chemical composition and structural features of cellolignin from steam explosion followed by enzymatic hydrolysis of Eucalyptus globulus bark

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