NOVELTY - Hydrocarbon-soluble bio-oil production involves grinding biomass (B), and then pre-treating the biomass by hydrolyzing with an acid catalyst (CA) selected form hydrochloric, acetic acid, sulfuric acid, and basic catalyst (CB) selected form sodium hydroxide, potassium hydroxide, calcium hydroxide. The treated biomass is heated by using microwaves to protect hydroxyl groups by using a solvent (SC) selected from pure acetone (AC) with 20% cyclohexane (CH), an acid selected from sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid, ferric chloride hexahydrate or anhydrous oxalic acid.    USE - Method for producing hydrocarbon-soluble bio-oil used in various refining processes, as well as in other catalytic processes for producing fuels and chemical and petrochemical products.    ADVANTAGE - The method produces the hydrocarbon-soluble bio-oil in a simple manner under mild reaction conditions in presence of hydrocarbons.    DETAILED DESCRIPTION - Hydrocarbon-soluble bio-oil production involves grinding biomass (B), and then pre-treating the biomass by hydrolyzing with an acid catalyst (CA) selected form hydrochloric, acetic acid, sulfuric acid, and basic catalyst (CB) selected form sodium hydroxide, potassium hydroxide, calcium hydroxide. The treated biomass is heated by using microwaves to protect hydroxyl groups by using a solvent (SC) selected from pure acetone (AC) with 20% o cyclohexane (CH), an acid selected from sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid, ferric chloride hexahydrate or anhydrous oxalic acid, a mixture of an acid and zeolite (Z). The formed mixture is filtered to get biomass residue and an organic phase rich in acetone. The obtained organic phase is neutralized with alkaline compounds selected from solid sodium hydroxide, saturated aqueous solution of sodium hydroxide, solid sodium bicarbonate solution, solid sodium bicarbonate and a resin ion exchanger. The neutralized organic phase is dried with an anhydrous sodium sulfate, where the residual solvent is evaporated under reduced pressure at 40 degrees C to obtain hydrocarbon-soluble bio-oil.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic flowchart of the hydrocarbon-soluble bio-oil production method.    Pure acetone (AC)    Biomass (B)    Catalyst (CA)    Basic catalyst (CB)    Cyclohexane (CH)    Solvent (SC)    Zeolite (Z)