NOVELTY - Hydropyrolysis comprises e.g.: introducing oxygenated organic feedstock into fluidized bed reactor; introducing stream of fluidizing gas comprising mostly molecular hydrogen into the fluidized bed reactor, creating conditions under which rapid mixing and heat transfer occur throughout the fluidized bed (140); maintaining a deep bed of solid particles of catalyst; and removing solid residues, remaining after devolatilization and hydropyrolysis of the feedstock, from the fluidized bed reactor via entrainment in the stream of fluidizing gas and product vapors exiting the fluidized bed reactor.    USE - The method is useful for hydropyrolysis (claimed) for producing liquid fuels from biomass or other feedstocks.    ADVANTAGE - The method: improves the economic viability of hydroconversion of conventional pyrolysis liquids; utilizes the catalyst which reduces the collective oxygen content of produced hydrocarbon vapors; provides high quality liquid hydrocarbon fuels; and utilizes insert that prevents the formation of slugs, and enables rapid, uniform axial and radial mixing in deep beds.    DETAILED DESCRIPTION - Hydropyrolysis comprises: introducing an oxygenated organic feedstock into a fluidized bed reactor, where the feedstock is rapidly heated from ambient temperature to the temperature of the fluidized bed, thus devolatilized; introducing a stream of fluidizing gas comprising mostly molecular hydrogen into the fluidized bed reactor, creating conditions under which rapid mixing and heat transfer occur throughout the fluidized bed (140); maintaining a deep bed of solid particles of catalyst, the depth of which is significantly greater than 2 reactor diameters, in a state of vigorous motion, to promote reactions resulting in deoxygenation and chemical stabilization of vapors produced when the feedstock is devolatilized; removing solid residues, remaining after devolatilization and hydropyrolysis of the feedstock, from the fluidized bed reactor via entrainment in the stream of fluidizing gas and product vapors exiting the fluidized bed reactor; removing attritted residues of catalyst, but not intact particles of catalyst, or particles of catalyst that have been minimally attritted, from the fluidized bed reactor via entrainment in the stream of fluidizing gas and product vapors exiting the fluidized bed reactor; separating the solid residues, entrained in the stream of fluidizing gas and product vapors exiting the fluidized bed reactor, from the stream of fluidizing gas and product vapors exiting the fluidized bed reactor; recovering a product stream of hydrocarbon vapors comprises hydrocarbon species with atmospheric-pressure boiling points, consistent with those of at least one of gasoline, paraffin or diesel fuel, from the hydropyrolysis process as condensed liquid; releasing enough exothermic heat from the deoxygenation reactions occurring during hydropyrolysis of the feedstock to supply process heat required by endothermic processes occurring during hydropyrolysis of the feedstock, including chemical reactions, heating of feedstock, and evaporation of liquids; and dispersing at least one modification to an interior of the reactor vessel, in such a manner that slugging does not occur within the fluidized bed reactor.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic flow diagram of the hydropyrolysis process for producing liquid fuels from biomass or other feedstocks.    Fluidized-bed reactor vessel (100)    Hot filtration system (120)    Insert (130)    Fluidized bed (140)    Fluidizing gas stream (150)