NOVELTY - Producing (100) higher hydrocarbons, comprises: (a) providing biomass feedstock (1) containing cellulose and water; (b) contacting the feedstock with organic solvent to form digested biomass stream (22); (c) contacting digested biomass stream with molecular hydrogen in presence of metal catalyst; (d) phase separating hydrocatalytically treated mixture into organic hydrocarbon-rich phase (35) and water phase; (e) providing at least a portion of organic hydrocarbon-rich phase to step (b) to form at least a portion of organic solvent; and (f) processing e.g. at least a portion of water phase.    USE - The method is useful for producing higher hydrocarbons (claimed), which are useful for forming transportation fuels (including synthetic gasoline, diesel fuel and jet fuel), and industrial chemicals.    ADVANTAGE - The method: utilizes the organic hydrocarbon-rich solvent, which improves the solubilization of hydrogen into the reaction mixture, and prevents the deposition of tar or heavy ends during biomass digestion; favors the formation of a significant fraction of organic phase components, as opposed to aqueous soluble components; allows the recycling of organic solvent phase via liquid-liquid separation; requires less energy and equipment, hence it is cost effective; and minimizes the formation of unwanted by-products, hence it is effective in hydrocatalytic processing, as compared to conventional process conducted in the presence of a fully water miscible, aqueous solvent mixture.    DETAILED DESCRIPTION - Producing (100) higher hydrocarbons, comprises: (a) providing a biomass feedstock (1) containing cellulose and water; (b) contacting the biomass feedstock with an organic solvent having partial miscibility with water at 25 degrees C to form a digested biomass stream (22) containing the organic solvent and water at an organic solvent to water mass ratio of greater than 1:1; (c) contacting the digested biomass stream with molecular hydrogen in the presence of a metal catalyst capable of activating molecular hydrogen, under organic phase hydrothermal conditions to form a hydrocatalytically treated mixture that contains many hydrocarbon molecules and oxygenated hydrocarbon molecules; (d) phase separating the hydrocatalytically treated mixture into an organic hydrocarbon-rich phase (35) and a water phase comprising water soluble oxygenated hydrocarbons, by liquid-liquid separation (30); (e) providing at least a portion of the organic hydrocarbon-rich phase to step (b) to form at least a portion of the organic solvent; and (f) processing at least a portion of the water phase and/or at least a portion of the organic hydrocarbon-rich phase to form a fuel blend comprising higher hydrocarbons.    DESCRIPTION OF DRAWING(S) - The figure illustrates a block flow diagram of a higher hydrocarbon production process.    Feedstock (1)    Digested biomass stream (22)    Liquid-liquid separation (30)    Organic hydrocarbon-rich phase (35)    Higher hydrocarbon production process (100)