A series of batch experiments were performed to characterize the composition change of tars generated from pyrolysis of organic fraction of municipal solid waste (OFMSW) at the final pyrolysis temperatures of 600, 700 and 800℃, respectively. The carbon content in the tars increased from 74.49% to 83.42% with the pyrolysis temperature increased from 600 to 800℃. Although the aromaticity of tars was higher than OFMSW and lower than chars, the polarity of tars was lower than both OFMSW and chars. Decreases in H/C and O/C ratios in tars were observed with the increase in final pyrolysis temperature. The content of polycyclic aromatic hydrocarbons (PAHs), the dominant components of tars, increased from 54.06% to 83.45% when the pyrolysis temperature rose from 600 to 800°C. Naphthalene and its derivatives were main components of PAHs, and they accounted for 50.72%, 46.80% and 39.26% of total PAHs in tars that were obtained at 600, 700, 800℃, respectively. The pyrolysis tars generated from OFMSW could be utilized as carbon based matrix composites and the raw materials for the production of dyes, resins, solvents, and insect repellents, etc.
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