However, academic researchers are still on the lookout for the perfect method to break downcellulose. The group of Ferdi Schüth at the Max Planck Institute for coal research in Mülheim had studied the promising option of using ionic Feature liquids as a solvent for catalytic depolymerisation of cellulose (R. Rinaldi et al. Angew. Chem. Int. Ed. (2008), 47, 8047–8050). They found, however, that the recovery of the valuable solvents was so difficult that the process wouldn’t be economically viable. In their most recent effort, due to be publishedin ChemSusChem, Schüth’s group describes how a pretreatment with catalytic amounts of acid enables the mechanical disruption of cellulose by milling. The resulting fragments are water soluble and can then be fully hydrolysed in aqueous medium.
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