Thermogravimetric analysis and fast pyrolysis of Milkweed

•Thermogravimetric analysis of Milkweed in TGA.•Fast pyrolysis of Milkweed in a bubbling fluidized bed reactor.•Milkweed pyolysis oil hve muchiger HHV compared to othr lgnocelluosic pyrolyis oils.•The pH of te Mikweed pyrlysis oils was almost neutral (pH 7.37) which was the higest reported data. 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.