title: Value added liquid products from waste biomass pyrolysis using pretreatments.
abstract: Douglas fir wood, a forestry waste, was attempted to be converted into value added products by pretreatments followed by pyrolysis. Four different types of pretreatments were employed, namely, hot water treatment, torrefaction, sulphuric acid and ammonium phosphate doping. Subsequently, pyrolysis was done at 500°C and the resulting bio-oils were analysed for their chemical composition using Karl Fischer titration, thermogravimetry, ion exchange, and gas chromatography. Pretreatment with acid resulted in the highest yield of bio-oil (~60%). The acid and salt pretreatments were responsible for drastic reduction in the lignin oligomers and enhancement of water content in the pyrolytic liquid. The quantity of xylose/mannose reduced as a result of pretreatments. Although, the content of fermentable sugars remained similar across all the pretreatments, the yield of levoglucosan increased. Pretreatment of the biomass with acid yielded the highest amount of levoglucosan in the bio-oil (13.21%). The acid and salt pretreatments also elevated the amount of acetic acid in the bio-oils. Addition of acid and salt to the biomass altered the interaction of cellulose-lignin in the pyrolysis regime. Application of pretreatments should be based on the intended end use of the liquid product having a desired chemical composition.
authors: Department of Biological Systems Engineering, Washington State University, Pullman, 99164-6120 WA, USA; Department of Civil and Environmental Engineering, University of Auckland, Auckland 1142, New Zealand.
authors: Oisik
authors: O
authors: Das
authors: Department of Civil and Environmental Engineering, University of Auckland, Auckland 1142, New Zealand. Electronic address: a.sarmah@auckland.ac.nz.
authors: Ajit K
authors: AK
authors: Sarmah
mesh_terms: D056804:Biofuels; D018533:Biomass; D016468:Forestry; D006358:Hot Temperature; D007220:Industrial Waste; D008031:Lignin / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D014934:Wood / Q000737:chemistry
chemical_list: D056804:Biofuels; D007220:Industrial Waste; D008031:Lignin
keywords: Bio-oil; Cellulose; Levoglucosan; Lignin; Sugars; Sulphuric acid