9 CHAPTER 9 Direct thermochemical liquefaction The term direct thermochemical liquefaction (DTL) covers two main technologies: solvent liquefaction and pyrolysis. Both can use a range of resources such as biomass feedstocks and biomass-based residues and wastes. The products of these processes are bio-crudes (from solvent liquefaction) or bio-oils (from pyrolysis). Bio-oil from fast pyrolysis is … Continue reading Direct thermochemical liquefaction