Abstract
The effect of weight ratio of plywood manufacturing by-product birch sawdust (BS) to water (1/2–1/8), reaction temperature (200–340°C), initial H2 pressure (0–10MPa), residence time (5–90min), catalysts amount (0.25–7.0wt.%) and type (FeSO4, ZnSO4, NiSO4, Raney-nickel, Ni65%/SiO2Al2O3, Na2CO3 and NaOH) on hydrothermal liquefaction of BS was investigated. High yield of bio-oil (54.1%) with calorific value (CV) 24.9MJ/kg under developed optimal experimental conditions in the presence of NaOH (5wt.%) utilizing weight ratio of BS to water 1/4, residence time 5min, mixing speed 250rpm at 300°C without pressurized particular inert gas or H2 atmosphere was achieved. Compounds in bio-oil analyzed by gas chromatography-mass spectrometry (GC-MS) have suitable chemical structures for conversion into renewable hydrocarbons. Marketable solid residue (SR) with yield 7.1%, high CV (29.8MJ/kg) and perspective characteristics for industrial application was obtained. Produced gas in process analyzed by gas chromatography-thermal conductivity detector (GC–TCD) contains 60.1vol.% of CO2.
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