NOVELTY - Converting biomass into higher value hydrocarbon products, comprises e.g. (i) conducting a feed stream comprising the biomass and water, into a reaction vessel, (ii) introducing at least one co-feed into a reaction vessel comprising a synthesis gas or a hydrocarbon compound (I), (iii) operating the reaction vessel at 200-500 degrees C at a pressure, which is greater than or equal to the saturated water vapor pressure, to obtain a heated hydrocarbon-containing product stream, and (iv) conducting the hydrocarbon-containing product stream into a first separation zone.    USE - The hydrocarbon products are useful for fuels, preferably transportation fuels, and refinery and chemical feedstock.    ADVANTAGE - The method makes use of the co-feed, which avoids the formation of thick oxygenated oil, produces less carbon dioxide and low oxygen concentrations in the product, and achieves high energy content of the product.    DETAILED DESCRIPTION - Converting biomass into higher value hydrocarbon products, comprises (a) introducing the biomass, water and at least one co-feed into a reaction vessel, which operates at a temperature of 200-500 degrees C, at a pressure that is greater than the saturated water vapor pressure within the reaction vessel, and at a residence time of 1-30 minutes to obtain a hydrocarbon containing product stream; or (i) conducting a feed stream comprising the biomass and water, into a reaction vessel, (ii) introducing at least one co-feed into a reaction vessel comprising a synthesis gas or a hydrocarbon compound of formula (CxHyOz) (I), (iii) operating the reaction vessel at 200-500 degrees C at a pressure which is greater than or equal to the saturated water vapor pressure, preferably greater than the saturated water vapor pressure within the reaction vessel, to obtain a heated hydrocarbon-containing product stream, (iv) conducting the hydrocarbon-containing product stream into a first separation zone for separating a gaseous fraction containing light hydrocarbons, a liquid fraction comprising a hydrocarbon fraction, and a water fraction containing entrained solids, (v) conducting the gaseous fraction from the first separation zone to a second separation zone, where at least a light hydrocarbon fraction is separated from a flue gas fraction, and (vi) conducting the liquid fraction from the first separation zone into a third separation zone, where at least a portion of the hydrocarbon fraction is separated from the water fraction containing entrained solids.    x = 1-20;    y = 2-42; and    z = 0.1-2    .    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic flow diagram for converting the biomass into a higher value hydrocarbon products.