NOVELTY - Fractionating a biomass (11) involves: dispensing the biomass into at least one reaction chamber as sealable cartridge (1); injecting a working fluid into the reaction chamber; subjecting the biomass to at least one specified temperature and pressure profile; and selectively collecting volatile compounds as they are released. The method further involves agitating the biomass; subjecting the volatile compounds collected through a series of catalysts to produce at least one renewable fuel.    USE - For fractionating a biomass (claimed) and specific volatile components which are used in the production of a renewable liquid fuel, such as gasoline.    ADVANTAGE - The present method provides higher production rate for fractionation of biomass and for selectively separating specific volatile components, which may subsequently be used in the production of a renewable liquid fuel, such as gasoline; and achieves improved uniformity of biomass processing through the introduction of a mechanical agitator designed to mix the biomass during processing. The method is scalable, cost-effective, and mechanically reliable.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a processing cartridge apparatus comprising: a sealable container; a reaction chamber within the sealable container; a sealable port for adding feedstock to the reaction chamber; and at least one sealable fluid port operatively connecting the reaction chamber to the exterior of the sealable container when the fluid port is open; and    (2) a system of fractionating biomass to extract volatile compounds comprised of: reaction chambers into which biomass may be injected, and which include mechanical device of agitating the biomass, where the reaction chambers are capable of subjecting the biomass to a specified temperature and pressure profile, and at least one reaction chamber comprising a port; and a collection device for receiving volatile compounds as they are released via at least one port.    DESCRIPTION OF DRAWING(S) - The figure shows a side view and a front view of a drum rotor cartridge.    Drum rotor cartridge (1)    Cover (5)    Base plate (6)    Threads (7)    O-ring seal (8)    Central shaft (9)    Solid biomass (11)