Abstract
Pyrolysis of Milkweed was carried out in a thermogravimetric analyzer and a bubbling fluidized bed reactor. Total liquid yield of Milkweed pyrolysis was between 40.74% and 44.19wt% between 425°C and 550°C. The gas yield increased from 27.90wt% to 33.33wt% with increasing reaction temperature. The higher heating values (HHV) of the Milkweed bio-oil were relatively high (30.33–32.87MJ/kg) and varied with reaction temperature, feeding rate and fluidization velocity. The selectivity for CO2 was highest within non-condensable gases, and the molar ratio of CO2/CO was about 3 at the different reaction conditions. The 13C NMR analysis, of the bio-oil showed that the relative concentration carboxylic group and its derivatives was higher at 425°C than 475°C, which resulted in slightly higher oxygen content in bio-oil. The pH of aqueous phase obtained at 475°C was 7.37 which is the highest reported for any lignocellulosic biomass pyrolysis oils.
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