Catalyzed hydrothermal carbonization of woody biomass produces hydrochar and valuable aqueous products (VAPs) that could potentially be harvested to facilitate commercialization of the process. Acetic acid, formic acid, glycolic acid, levulinic acid, 5-hydroxymethyl-2-furfural, and furfural are potential VAPs found in the process liquid. Recycling the process liquid increased the yields of VAPs not associated with hydrochar production, except for formic acid. Yields increased with liquid-to-biomass ratio peaking at 10:1 for all but levulinic acid. The higher-heating-value of the hydrochar, (27.6 ± 0.3) MJ/kg, was not affected by recycling or liquid-to-biomass ratio. Energy yield of catalyzed hydrothermal carbonization increased from 72% to 80% when the process liquid was recycled. Energy yields for hydrochar production increased by 12 percentage points when the liquid-to-biomass ratio was decreased from 12:1 to 3:1.

catalyzed hydrothermal carbonization, hydrochar, liquid-to-biomass 26 ratio, recycling process liquid, valuable aqueous products
Energy and Fuels
Department of Mechanical and Aerospace Engineering

Ghaziaskar, A. (Amin), McRae, G, MacKintosh, A. (Alexis), Lai, E.P.C, & Basu, O. (2019). Production of Organic Compounds through Catalyzed Hydrothermal Carbonization of Woody Biomass. Energy and Fuels. doi:10.1021/acs.energyfuels.9b01979