NOVELTY - Integrated biomass pyrolysis and fractionation involves: introducing biomass feedstock to reactor, under fast pyrolysis conditions, in presence of heat carrier and/or heated gas to convert biomass to form mixture of condensable vapors, aerosol droplets, non-condensable gases, and solid biochar; and introducing at least portion of mixture to multi-stage separator having electrochemical separator(s) followed by heat exchanger(s), operated under conditions to collect individual liquid bio-oil fractions, derived from condensable vapors and/or aerosol droplets.    USE - As integrated biomass pyrolysis and fractionation method to produce bio-oil fractions (claimed) as value-added products including chemicals, feedstocks, fuels, and renewable asphalt binders.    ADVANTAGE - The process involves converting biomass into bio-oil fractions using low-cost, integrated fast pyrolysis system. The system improves upon prior art by creating stable, bio-oil fractions which have unique properties that make them individually superior to conventional bio-oil. The process enables water and low-molecular weight compounds to be separated into final value-added fraction suitable for upgrading or extracting into value-added chemicals, fuels and water. Initial bio-oil fractions from process are chemically distinct, have low-water content and acidity which reduces processing costs normally associated with conventional bio-oil post-production upgrading since fewer separation steps, milder processing conditions and lower auxiliary inputs are required. Biochar is stabilized so that it can be handled safely. The reactor unit is bubbling fluidized bed and is fluidized with preheated gas. The reactor unit provides distinguished, low-cost fast pyrolysis system for producing value-added products from distinct liquid fractions. Further, various combinations of condensers (such as shell-and-tube heat exchangers) and electrochemical separators (such as electrostatic precipitators) are configured to collect individual liquid products comprising pyrolysis oil fractions. Condensers and electrostatic precipitators are simple, low maintenance, commercially proven equipment used in all types of industrial applications. The condenser(s) and electrochemical separator(s) exploit different behavior and properties of vapors and aerosols exiting pyrolysis reactor to collect chemically unique liquid products. The method integrates these unit operations with auxiliary fast pyrolysis equipment and improves upon prior art by providing complete package for efficient, low-cost production of unique bio-oil fractions. This technology and combination of equipment provide value-added bio-oil product that is much more cost effective than combining fast pyrolysis with high-temperature, high-pressure Fisher Tropsch technology to create liquid fuels. Similarly, method reduces post-production upgrading costs normally associated with conventional bio-oil post-production by simplifying product(s) into chemically distinct fractions which require fewer separation steps, milder processing conditions and lower auxiliary inputs.    DETAILED DESCRIPTION - Integrated biomass pyrolysis and fractionation, involves: introducing biomass feedstock to reactor, operated under fast pyrolysis conditions, and in presence of heat carrier and/or heated gas to convert biomass to reaction mixture comprising condensable vapors, aerosol droplets, non-condensable gases, and solid biochar; and introducing at least portion of reaction mixture to multi-stage separator comprising electrochemical separator(s) followed by heat exchanger(s) or heat exchanger(s) followed by electrochemical separator(s), where electrochemical separator(s) and heat exchanger(s) are operated under conditions to collect individual liquid bio-oil fractions, including final liquid bio-oil fraction, each derived from condensable vapors and/or aerosol droplets, where treatment in multi-stage separator is optionally performed in presence of catalyst. The reactor is fluidized-bed reactor that is fluidized with fluidizing gas that includes at least some of non-condensable gas; or auger-type reactor comprising at least one auger for conveying reaction mixture and heat carrier and/or heated gas. The multi-stage separator comprises greater than or equal to 2 electrochemical separators and greater than or equal to 2 heat exchangers, collectively integrated to collect multiple liquid fractions from reaction mixture. The heat exchanger(s) utilize spray quench system. The heat exchanger(s) and electrochemical separator(s) are operated with heat exchanger wall temperature, and electrochemical separator wall temperature, maintained above water saturation temperature at water vapor pressure determined within heat exchanger(s) and electrochemical separator(s), respectively, such that water content is maximized in final liquid bio-oil fraction; or heat exchanger(s) is operated with wall temperature maintained above water saturation temperature at water vapor pressure determined within heat exchanger(s), to minimize water content in one of individual liquid bio-oil fractions; or heat exchanger(s) is operated at selected temperature to optimize content of selected species or class of molecules in one of individual liquid bio-oil fractions, where selected species is not water, and is selected from furans, carbohydrates, acetic acid, levoglucosan, syringols, guaiacols, aldehydes, ketones, and phenolic compounds. The method further involves extracting lignin-derived oligomers from individual liquid bio-oil fraction(s). The bio-oil fraction(s) is further treated by heating, aging, blending, reacting, upgrading, refining, hydrotreating, extracting, adding emulsifier, adding surfactant, and/or adding chemical additive.    DESCRIPTION OF DRAWING(S) - The figure shows the process for integrated biomass fast pyrolysis and fractionation.