Journal
CELLULOSE
Volume 28, Issue 3, Pages 1311-1320Publisher
SPRINGER
DOI: 10.1007/s10570-020-03642-4
Keywords
Dissolving pulp; Organic electrolyte solutions; Ionic liquid; EminAc; GVL; Hemicellulose removal
Funding
- Canada Research Chair's Program of the Government of Canada [231308]
- National Natural Science Foundation of China [31700510]
- China Scholarship Council [201908610074]
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In this laboratory study, hardwood bleached kraft pulp was converted to dissolving pulp by removing hemicellulose using organic electrolyte solutions. The optimal conditions led to a dissolving pulp with a yield of 76%, cellulose content of 91%. The study also explored the potential of selectively removing hemicelluloses using a ternary system.
In this laboratory study, a hardwood bleached kraft pulp (HBKP) was converted to dissolving pulp by removing hemicellulose using organic electrolyte solutions (OES), consisting of ionic liquid (1-ethyl-3-methylimidazolium acetate (EminAc)) and a polar organic solvent gamma-valerolactone (GVL). The molar ratio of GVL/EmimAc, and temperature have significant effect on the swelling of HBKP fibers, thus the hemicellulose dissolution/removal process. Under the optimal conditions of GVL/EmimAc molar ratio of 4 and 60 degrees C, hemicellulose was effectively removed, leading to the formation of a dissolving pulp with yield of 76%, cellulose content of 91%, Fock reactivity of 56.8% and viscosity of 723 mL/g. Furthermore, the potential of using EmimAc/GVL/water ternary system to selectively remove hemicelluloses from the same HBKP was studied. The GVL/EmimAc/water ratio of 2:1:1 at 60 degrees C showed promising results, with yield of 76.7%, and cellulose content of 94.8%.
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