Deconstruction of Nordic hardwood in switchable ionic liquids and acylation of the dissolved cellulose

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Valerie Eta, Jyri-Pekka Mikkola
Publiceringsår: 2016
Tidskrift: Carbohydrate Polymers
Volym: 136
Artikelns första sida, sidnummer: 459
Artikelns sista sida, sidnummer: 465
eISSN: 1879-1344


Abstrakt

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.

Senast uppdaterad 2019-25-08 vid 05:24