NOVELTY - Continuously capturing BioOil and its constituents from a gas stream produced in a fast pyrolysis/thermolysis process comprises separating BioOil and its constituents from a gas stream using hot inertial separation to maintain the BioOil and its sticky and/or thick constituents at a temperature below its point of rapid degradation; and reducing gas velocity to a temperature sufficiently low to allow droplets in the gas stream to settle out.    USE - For continuously capturing BioOil and its constituents from a gas stream produced in a fast pyrolysis/thermolysis of biomass process.    ADVANTAGE - The invention reduces the moisture and aerosol load on a downstream electrostatic precipitator, making it possible to reduce the electrostatic precipitator size by 70%. It produces all captured products and component in an easily handled liquid form. It reduces or eliminates condensation on the electrostatic precipitator insulators, electrostatics precipitator electrode fouling, compressor fouling, gas heat exchanger fouling, gas cooler fouling, scaling on the instruments, pressure drop associated with filtration equipment, and environmental issues, e.g. waste disposal due to filter or mesh replacement.    DETAILED DESCRIPTION - Continuously capturing BioOil and its constituents from a gas stream produced in a fast pyrolysis/thermolysis process in a usable liquid form to produce a non-condensable gas free of fouling contaminates comprises separating BioOil and its constituents from a gas stream using hot inertial separation to maintain the BioOil and its sticky and/or thick constituents at a temperature below its point of rapid degradation and above a point at which its viscosity is low enough to avoid inefficient operation of the separation equipment; reducing gas velocity to a temperature sufficiently low to allow droplets in the gas stream to settle out but high enough so that a viscosity of the droplets remains low enough to avoid inefficient operation of the separation equipment; and condensing vapor in the gas stream. An INDEPENDENT CLAIM is also included for BioOil capturing apparatus comprising a separator operative to separate BioOil and its constituents from a gas stream and to maintain the temperature of the BioOil and its constituents such that its sticky and/or thick constituents are below a point of rapid degradation but above a point at which their viscosity is low enough to avoid inefficient operation of the separation equipment; a gas retention apparatus operative to reduce gas velocity with a temperature sufficiently low to allow droplets in the gas stream to settle out but high enough so that a viscosity of the droplets remains low enough to avoid inefficient operation of the separation equipment; and a condensing section coupled to an outlet of the gas retention apparatus operative to cool the gas to a temperature low enough to condense vapors into a free flowing liquid but above a freezing point of the liquids.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic of the Hot Back End System.