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. torrelaction 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 yiekt of bio-oil The salt pretreatments in the lignin oligomers and (-60x), acid and were responsible for drastic reduction as a result of enhancement of water content in the reduced pretreatments. Although, the content of fermentable sugars remained similar across all the pretreatments, the yield of levoglucosan increased. Pretreatment of the bioinass acid yielded the highest amount of levoglucosan in the bio-oil (13.21s). The acid and salt pretreatmehts also elevated the amount of acetic acid in the bio-oils. Addition of acid and salt to the biomass altered the interaction efcellulose-lignin in the pyrolysis regime. Application of pretreatments should be based on the intendedend use of the liquid product having a desired chemical composition. c 2015 Elsevier B.V. All rights reserved.
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. torrelaction 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 yiekt of bio-oil The salt pretreatments in the lignin oligomers and (-60x), acid and were responsible for drastic reduction as a result of enhancement of water content in the reduced pretreatments. Although, the content of fermentable sugars remained similar across all the pretreatments, the yield of levoglucosan increased. Pretreatment of the bioinass acid yielded the highest amount of levoglucosan in the bio-oil (13.21s). The acid and salt pretreatmehts also elevated the amount of acetic acid in the bio-oils. Addition of acid and salt to the biomass altered the interaction efcellulose-lignin in the pyrolysis regime. Application of pretreatments should be based on the intendedend use of the liquid product having a desired chemical composition. c 2015 Elsevier B.V. All rights reserved.
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