Hydro-liquefaction Of Lignified Biomass

Under pressure of energy and environment, developing clean and reproducible energy becomes to be urgent problem all over the world. Biomass has large quantity, distribution, available to obtain and storage and environmentally, so biomass energy converting technology has been hot spot in many countries. Hydro-liquefaction of lignified biomass was studied in this article.Corn stalk and bamboo was selected for material in this experiment, water as solvent, NaOH as catalyst, with hydrogen Providing high pressure, and then liquefaction was realized under proper temperature, to produce bio-oil. By reviewing the effect of reaction temperature, pressure, time, solvent and catalyst on liquefaction the optimal process condition was obtained. Then the physical and chemical character of liquefaction product and reaction mechanism was studied by using different detection method including calorific value analysis, IR, SEM, GPC and GC-MS so that the theory system was enriched.Through lots of experiments the optimal condition of hydro-liquefaction of biomass was concluded: weight ratio of biomass and solvent was 1/10~1/6, reaction temperature was 210~240℃, initial pressure of hydrogen was 7~8MPa, remaining time was 20~30min, weight of NaOH was 10~15% of dried material. The liquefaction rate was up to 90%, and bio-oil yield was 50% under this condition. The bio-oil was black brawn liquid like tar. Its gross calorific value was 30MJ/kg, increasing by 66%~68%。GC-MS detection result shows that components of bio-oil were complex, up to 40 species or more, much of which was organic acid, ketone and phenolic and that oxygen ratio was high. The bio-oil obtained by hydro-liquefaction needed to be separated and purified further if applied in practice.