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Lumping Strategy in Kinetic Modeling of Vacuum Pyrolysis of Plant Oil Asphalt

Zheng, Yanyan, Tang, Qiang, Wang, Tiefeng, Wang, Jinfu
Energy & Fuels 2015 v.29 no.3 pp. 1729-1734
biochar, biodiesel, biogas, biomass, bitumen, feedstocks, industry, kinetics, plant fats and oils, pyrolysis, reaction mechanisms, temperature, vapors
Plant oil asphalt (POA) is an underutilized lipid-based biomass residue mainly generated in the biodiesel industry. This work presents application of the lumping strategy in kinetic modeling of vacuum pyrolysis of POA in a pilot-scale semi-batch reactor. Pyrolysis experiments were conducted under different reaction temperatures (410, 430, and 450 °C) and reaction times (10, 15, 20, 25, 40, 50, and 60 min). The reaction scheme was divided into five lumps, namely, feedstock lump (POA) and four pyrolytic product lumps (including biogas, biochar, hydrocarbon components in pyrolytic oil, and oxygenated components in pyrolytic oil). In the kinetic model, reactions from the feedstock lump to the four pyrolytic product lumps were assumed to be independent parallel, while the secondary reactions between four pyrolytic product lumps were neglected because of the short residence time of the pyrolytic vapor in the pyrolysis zone. Results showed that four independent parallel reactions all followed first-order kinetics. The kinetic model estimated the Arrhenius parameters and showed high capability to predict the concentration of pyrolytic product lumps, especially the relative distribution of hydrocarbon components and oxygenated components in pyrolytic oil.