Abstract
This study reports a two-step hydrolysis process for achieving near-complete recovery of sugar monomers from crystalline cellulose or lignocellulosic biomass. The first step is mechanochemical hydrolysis of the acid-impregnated sample in the solid state via ball milling at room temperature. It was found that mechanochemical hydrolysis not only effectively breaks the hydrogen-bonding network within the crystalline cellulose but also drives the acid-catalyzed hydrolysis reactions to form water-soluble products, mainly consisting of glucose and its oligomers, with a degree of polymerization up to 15. However, mechanochemical hydrolysis appears to be incapable of further hydrolyzing these oligomers into monomers and, hence, is not suitable for producing sugar monomers directly. Therefore, the second step is dilute acid hydrolysis of the mechanochemically hydrolyzed sample in the aqueous phase under low-severity conditions, i.e., at a low acid concentration of 0.25 wt % and a low temperature of 150 °C. The sec...
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