Transformations of glucuronoxylan during acid sulphite pulping of eucalyptus dissolving pulp

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