NOVELTY - Producing bio-oil comprises: dehydrating a feedstock composition comprising a biomass-material and a polymer; decomposing the feedstock composition to obtain vapors and char; condensing the vapors to obtain first bio-oil; segregating the first bio-oil into aqueous bio-oil and organic bio-oil; settling the aqueous bio-oil under gravity to obtain second bio-oil; settling the organic bio-oil under gravity to obtain third bio-oil; and blending the second bio-oil and the third bio-oil to obtain fourth bio-oil.    USE - The method is useful for producing bio-oil (claimed) which is used as an alternate source of energy.    ADVANTAGE - The method: provide the bio-oil with a pH value of 7-8 and increased paraffins, olefins and aromatics (hydrocarbons at large) quantity, and thus are chemically stable; improves the yield and quality of the bio-oil; utilizes hydrogen which during the decomposition step reduces oxygen-containing compounds, as the hydrogen reacts to make hydrocarbons instead of aromatics or oxygen-containing compounds, thus reducing 90% of the oxygenates; and removes the requirement of employing expensive and complicated secondary processes.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a reactor (300) comprising: a treatment unit (301) which is configured to receive the feedstock composition, and dehydrate and decompose the feedstock composition to obtain vapors and char; a condenser (303) configured to receive the vapors and condense the vapors to obtain first bio-oil; a segregator (305) configured to segregate the first bio-oil into aqueous bio-oil and organic bio-oil; a first gravity settler (307) configured to receive the aqueous bio-oil and obtain second bio-oil from the aqueous bio-oil by settling the aqueous bio-oil under gravity; a second gravity settler configured to receive the organic bio-oil and obtain third bio-oil from the organic bio-oil by settling the organic bio-oil under gravity; and a blender configured to receive the third bio-oil and the second bio-oil to and blend the third bio-oil and the second bio-oil to obtain fourth bio-oil;    (2) a device comprising a receiver configured to receive first bio-oil, where the first bio-oil is condensed from vapors of the feedstock composition, and the feedstock composition is dehydrated and decomposed to obtain the vapors, the segregator, the first gravity settler, the second gravity settler, and the blender;    (3) a fourth bio-oil composition comprising either 5-35% of paraffin, 15-30% of olefins, 25-70% of aromatics, 4-9% of oxygenates and 0.1-1% of nitrogen compounds, or 75-85% of carbon, 8-15% of hydrogen, 2-3.5% of oxygen and 1-3% of nitrogen; and    (4) a feedstock composition comprising either 70-50% of the biomass-material and 30-50% of the polymer, where the feedstock composition is configured to obtain fourth bio-oil comprising a composition of 5-35% of paraffin, 15-30% of olefins, 25-70% of aromatics, 4-9% of oxygenates and 0.1-1% of nitrogen compounds, or 70-75% of carbon, 6-15% of hydrogen, 0.5-0.95% of nitrogen, and 20-22% of oxygen, where the feedstock composition is configured to obtain fourth bio-oil comprising 75-85% of carbon, 8-15% of hydrogen, 2-3.5% of oxygen and 1-3% of nitrogen.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagrammatic view of the reactor.    Reactor (300)    Treatment unit (301)    Condenser (303)    Segregator (305)    First gravity settler (307)