(475a) Oxidation of Lignin-Rich Residue from Deacetylation, Mechanical Refining, and Enzymatic Hydrolysis of Lignocellulose

Production of aromatic aldehydes, such as vanillin, from lignin, has been an intriguing process for decades, but widespread implementation has been inhibited by the high hydroxide:lignin ratios required for significant aldehyde yields, as well as the widely different chemical structure of industrial lignins. In this work, we explore oxidation of the lignin-rich residue isolated from corn stover after deacetylation, mechanical refining, and enzymatic hydrolysis (DMR lignin), including a survey of reaction conditions and detailed product characterization that accounts for greater than 60% of substrate carbon as quantified products (aromatic monomers, aliphatic acids, and carbonate) and the remainder as an oligomeric oil. We also discuss strategies for maximizing selectivity to desired products and separating them from the alkaline solution.