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The lignocellulosic biomass is produced worldwide in large quantities, which may contribute to environmental changes, global warming, wildfires, ocean and sea level rise. Recent research demonstrated efficacy of the thermal reconversion of black liquor, which represents a waste resulted from wood Kraft pulping, into gaseous (syngas), liquid (bio-oil) and solid (bio-char) final products through the pyrolysis process. This review describes the physical chemical and energy features of black liquor required for its va...