Abstract
In this study, the pyrolysis behaviors, kinetics and product distribution of black liquor solid (BLS) and precipitated lignin (PL) were studied by TGA, Py-GC/MS and a homemade down tube reactor. Compared with PL, the pyrolysis process of BLS was more complex and the residue was lower based on TG/DTG analysis. The average activation energy of BLS (440 ~ 456 KJ/mol) calculated by three model-free methods were higher than that of PL (293 ~ 339 KJ/mol). Py-GC/MS analysis showed that the total content of aromatic monomers in BLS bio-oil products was 26.02 ~ 26.50% (750 ~ 850 °C), while it was 57.86 ~ 66.58% in PL bio-oil products. Moreover, BLS obtained a maximum aromatic hydrocarbon content of 90.15% (950 °C) through down tube reactor pyrolysis, while it was 81.38% for PL. The alkali catalysis of the inorganic salt in BLS promoted the removal of phenolic hydroxyl groups.
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