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Co-liquefaction of spent coffee grounds and lignocellulosic feedstocks

Yang, Linxi, He, Quan (Sophia), Havard, Peter, Corscadden, Kenneth, Xu, Chunbao (Charles), Wang, Xuan
Bioresource technology 2017 v.237 pp. 108-121
Pinus, adverse effects, bark, biofuels, biomass, catalysts, chemical composition, corn stover, feedstocks, gas chromatography-mass spectrometry, heat, lignocellulose, liquefaction, mixing, molecular weight, oils, paper, sodium hydroxide, synergism, temperature, viscometers, viscosity
Co-liquefaction of spent coffee grounds (SCG) with paper filter (PF), corn stalk (CS) and white pine bark (WPB) respectively, was examined in subcritical water for bio-crude oil production. The optimum reaction temperature was 250°C, and the mixing biomass ratio was 1:1. SCG and CS was identified to be the best feedstock combination with a significant positive synergetic effect in the co-liquefaction process with 5% NaOH as a catalyst. The yield of bio-crude oil was increased by 20.9% compared to the mass averaged yield from two feedstocks, and the oil quality was also improved in terms of viscosity and relative molecular mass. A negative effect presented in the co-liquefaction of SCG/WPB. The resulting bio-crude oils were characterized by elemental analyzer, GC–MS, GPC and viscometer, indicating that mixing feedstock in the co-liquefaction process also influenced the higher heating value (HHV), viscosity, molecular mass and chemical composition of bio-crude oil.