Ionic liquid-aided carboxymethylation of kraft pulp
2010 (English)In: International journal of Chemical Reactor Engineering, ISSN 1542-6580, Vol. 8, no A102Article in journal (Refereed) Published
Different ionic liquids containing the cation such as 1-N-butyl-3-methylimida-zolium (Bmim+) are able to efficiently dissolve cellulose. The ability of ionic liquids to truly dissolve cellulose is significant when cellulose derivatization is attempted. A series of experiments on etherification (carboxymethylation) of cellulose was performed, using both the conventional suspension approach (slurry) with 2-propanol as the principal reaction media and a totally homogenous reaction approach utilizing ionic liquids as a reaction media capable of dissolving cellulose. It was observed that a pre-treatment with the ionic liquid 1-N-butyl-3-methylimidazolium iodide ([Bmim][I]) seems to promote substitution in line with the conventional, heterogeneous suspension process. Under carefully chosen reaction conditions, a higher degree of substitution was obtained when wetting the cellulose with [Bmim][I] prior to classical derivatization than without this pre-treatment. It was also observed that the substitution pattern was changing upon use of the ionic liquid [Bmim][I]. Upon a totally homogenous etherification, it was found that the ionic liquid 1-N-butyl-3-methylimidazolium acetate ([Bmim][oAc]) gave the highest degree of substitution. The product obtained was water-soluble and had a DS (degree of substitution) of 0.59. The substitution pattern of the products obtained from the homogenous reactions follow the same substitution pattern as the products obtained from the conventional suspension process. This indicates that the properties of the products are in line with products prepared via the conventional reaction route.
Place, publisher, year, edition, pages
Bepress , 2010. Vol. 8, no A102
carboxymethylation, cellulose, cellulose derivatives, etherification, ionic liquids
IdentifiersURN: urn:nbn:se:umu:diva-35212DOI: 10.2202/1542-6580.2321ISI: 000280497700016OAI: oai:DiVA.org:umu-35212DiVA: diva2:337897