Birch wood pre-hydrolysis vs pulp post-hydrolysis for the production of xylan-based compounds and cellulose for viscose application

摘要: Abstract Hydrothermal treatments of birch wood and kraft pulp were compared for their ability to extract the xylan produce viscose-grade pulp. Water post-hydrolysis produced a high-purity cellulosic with lower viscosity but higher cellulose yield than traditional pre-hydrolysis pulping wood. Post-hydrolysis also increased crystallite dimensions degree crystallinity in cellulose, promoted extent fibril aggregation. The specific surface area post-hydrolyzed pulps, derived from larger aggregates, decreased accessibility OH groups. However, this did not seem decrease reactivity derivatizing chemicals. In aqueous side-stream, xylose was similar both pre- post-hydrolysates, although conducting flow-through system enabled recovery high purity molar mass (∼10 kDa) high-value applications.