ABSTRACT
In this study, an anoxic pyrolysis mass production process, incorporating the application of the near-slow pyrolysis method, was used to decompose palm kernel shell waste at 500–550℃ to produce biochar, biogas, and liquid wood tar mixture products. The liquid wood tar mixture was stood for phase separation, then distilled to produce heavy metal-free wood vinegar with a pH value of about 3.5~4.1 and organic matter content of about 5.5%, of which the nitrogenous organic matter content was 0.2%. Further GC/MS analyses revealed its main component to be acetic acid and the presence of at least 32 kinds of organic substances, such as phenols, nitrogen-containing compounds, etc. Throughout the storage period, the color changed from light yellow to brown and the organic components also changes via oxidation or reduction reaction.
