NOVELTY - Biomass is fed (100) into a pyrolysis chamber (100), and heated (102) to create vapor phase bio oil. The vapor phase bio oil is carried (104) to a condenser, and quenched (110) into liquid phase raw bio oil in the condenser. Water is separated (112) from the raw bio oil in a separator to obtain refined bio oil and the refined bio oil is processed into a useful material.    USE - Production of useful bio oil material used for producing fuel oil (claimed). Can also be used as substitute for road asphalt.    ADVANTAGE - The method produces stable bio oil and fuel with high pH and extremely low viscosity. The bio oil has heating value increased by about 25%, providing commercial viability bio oil. The quenching of the vapors from the pyrolysis chamber reduces the tar formation which maintains low viscosity of the bio oil and prevents clogging of the lines and equipment by tar formation. The use of water as quenching medium provides better contact of water and oil and acts as a cooling medium. The stability of bio oil is enhanced by the addition of ethanol having a higher flash point and which is easier and safer to handle. Ethanol acts as an ignition improver and keeps the storage and contact surfaces clean.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for production of fuel oil from biomass material, which involves feeding biomass material into an oxygen rare pyrolysis chamber comprising at least three zones which are zone (I) nearest to the entry of the biomass feed material, zone (II) in middle and zone (III) opposite to the zone (I), heating the biomass material to create vapor phase bio oil, collecting vapor phase bio oil in collectors residing in each zone, carrying the collected vapor phase bio oil independently from each collector to corresponding condensers, quenching (106) the vapor phase bio oil before releasing the vapor phase bio oil into the condensers, condensing the vapor phase bio oil into liquid phase raw bio oil in the condensers, releasing the liquid phase raw bio oil into a separation tank, removing water from the liquid phase raw bio oil to produce refined bio oil (112), carrying the refined bio oil into a mixing tank, mixing (114) at least 20 vol.% ethanol to produce fuel oil and releasing fuel oil from the mixing tank.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of method for producing a useful bio oil material.    Biomass material feeding process (100)    Biomass material heating process (102)    Process for carrying vapor phase bio oil from the pyrolysis chamber to condenser (104)    Vapor phase bio oil quenching process (106)    Vapor phase bio oil cooling process (108)    Vapor phase bio oil condensing process (110)    Process for separating water from raw bio oil (112)    Ethanol mixing process (114)