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Synthesis of glucose esters from cellulose in ionic liquids
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Igor A. Ignatyev
Published/Copyright:
November 3, 2011
Abstract
The transformation of cellulose into glucose ester α-d-glucose pentaacetate (GPAc) was carried out in ionic liquid 1-butyl-3-methylimidazolium chloride under mild reaction conditions. The reaction comprises two steps: the first involves a hydrolysis reaction, yielding α-d-glucose and glucose oligomers; and then only after some time, the acetylating reagent acetic anhydride is added. Under optimized conditions and with the acidic resin Amberlyst 15DRY as a hydrolysis catalyst, a 70% yield of GPAc was obtained. This product could be quantitatively isolated by simple liquid-liquid extraction, which allowed easy recycling of the ionic liquid and catalyst.
Received: 2011-9-4
Accepted: 2011-10-10
Published Online: 2011-11-03
Published in Print: 2012-05-01
©2012 by Walter de Gruyter Berlin Boston
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Keywords for this article
acetylation;
acid catalysis;
cellulose;
ionic liquids;
heterogeneous catalysis
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