(449a) Desulfurization and Coking of Hydrocarbon Fractions from Biomass Pyrolysis Oils
Based on the hydrocarbon fraction of bio-oil, we processed the hydrocarbon fraction to produce fuel-grade hydrocarbons and calcined coke. We used bio-oils sourced from switchgrass and guayule bagasse feedstocks, the latter of which contains elevated levels of sulfur (400 â 500 ppm) due to biomass processing. Distilled fractions of bio-oil hydrocarbons were found to contain sulfur ranging from 400 â 700 ppm. Sulfur characterization revealed the sulfur groups to be labile, so Raney Nickel was used for hydrogenation, which reduced sulfur content to < 15 ppm. When co-processed with petroleum coke, the heaviest hydrocarbon fraction produces calcined coke with both a reduced metals concentration and sufficient crystallinity for aluminum smelting applications (~22 â 25 A).