9TH Thermal and Fluids Engineering Conference (Hybrid), April, 21-24, 2024, Oregon State University, Corvallis, OR, USA
With growing need for sustainable carbon neutral liquid fuels, low-grade feedstocks such as lignocellulosic biomass, and municipal solid wastes offer sufficient potential via thermochemical conversion. The existing thermochemical conversion offer limited feed flexibility, and scalability, and require significant processing (energy and costs) of the intermediates. Bio-oil/biocrude intermediate from fast-pyrolysis and hydrothermal techniques is impeded with issues of stability and oxygen content, along with hydrotreating viability. A novel pathway will be presented of near-critical CO2-assisted integrated liquefaction-extraction (NILE) technology for conversion of various biomass and municipal solid wastes into high-quality biocrude with high compatibility for co-hydrotreating with traditional fossil crude for liquid fuel needs in power and transportation sectors. Using supercritical CO2 for dewatering of wet feedstocks, and for liquefaction and extraction of lighter biocrude has produced biocrude with lower oxygen content (by 50%), lowered metal content (by 90%), and good stable viscosity, low acidity, and good aging stability compared to that produced from hydrothermal liquefaction along with higher hydrotreating and co-hydrotreating compatibility.
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