Deconstruction of Nordic hardwood in switchable ionic liquids and acylation of the dissolved cellulose
2016 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 136, 459-465 p.Article in journal (Refereed) Published
Nordic hardwood (Betula pendula) was fractionated in a batch autoclave equipped with a custom-made SpinChem® rotating bed reactor, at 120°C using CO2 and CS2-based switchable ionic liquids systems. Analyses of the non-dissolved wood after treatment showed that 64 wt% of hemicelluloses and 70 wt% of lignin were removed from the native wood. Long processing periods or successive short-time treatments using fresh SILs further decreased the amount of hemicelluloses and lignin in the non-dissolved fraction to 12 and 15 wt%, respectively. The cellulose-rich fraction was partially dissolved in an organic superbase and an ionic liquid system for further derivatization. Homogeneous acylation of the dissolved cellulose in the presence or absence of catalyst resulted in cellulose acetates with variable degree of substitution (DS), depending on the treatment conditions. By varying the reaction conditions, the cellulose acetate with the desired DS could be obtained under mild conditions.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 136, 459-465 p.
Birch, Wood fractionation, Switchable ionic liquids (SILs), Cellulose, Cellulose acetate, Degree of substitution
Chemical Sciences Polymer Technologies
IdentifiersURN: urn:nbn:se:umu:diva-110881DOI: 10.1016/j.carbpol.2015.09.058ISI: 000365972000055PubMedID: 26572376OAI: oai:DiVA.org:umu-110881DiVA: diva2:865663