Hydrothermal liquefaction of kitchen waste was processed for bio-oil production. The effects of reaction temperature and solid-liquid ratio on products distribution and bio-oil properties were investigated systematically. The highest bio-oil yield of 16.7% was obtained at 320℃ and 1:15. Further increasing temperature or decreasing solid-liquid ratio would promote gas formation. Bio-oil had higher oxygen and nitrogen content compared to heavy oil or residue oil. Over 50% of bio-oil fraction was in the naphtha
kerosene and AGO range. The higher heating value of bio-oil was 32.33—34.82 MJ·kg-1. Bio-oil was characterized using GC-MS
FT-IR and FT-ICR MS. Bio-oil was a complex mixture composed of hydrocarbons
acids
aldehydes
ketones
esters
amines
phenols
alcohols and N-heterocyclic compounds. Further analysis on the acidic compounds in bio-oil indicated that oxygenated compounds were primarily comprised of O2 and O3 species
nitrogenous compounds were mainly N1O2、N1O3 and N1O4 species.