TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Process: The temperature (t1) is maintained less than temperature (t2) by cooling catalyst stream (c1), adjusting flow rate of catalyst stream (c1), injecting a fluid comprising carbon monoxide or hydrogen donor material into reaction zone (r2) and/or adjusting flow rate of catalyst stream (c2). The product mixture further comprises a portion of catalyst, and product mixture is charged to a cyclone for separation into a hydrocarbon stream comprising hydrocarbons and a catalyst stream (c3). The catalyst stream (c3) is charged to reaction zone (r2). The hydrocarbon stream is charged to a fractionator (30) for separation into a gas stream, at least one liquid product stream and a heavy fraction. The heavy fraction is charged to reaction zone (r1) and/or reaction zone (r2). The solid biomass is charged to reaction zone (r1) by conduit (iv) for contact with a catalyst stream (c1) which is charged to reaction zone (r1) by conduit (i). The catalyst stream (c2) is charged to reaction zone (r2) by conduit (iii) for contact with biomass-catalyst mixture (m2). The spent catalyst is charged to regenerator by conduit (ii). The portion of regenerated catalyst is charged to reaction zone (r1) as catalyst stream (c1) by conduit (i), and a portion of regenerated catalyst is charged to reaction zone (r2) by conduit (iii) as catalyst stream (c2). The gaseous product stream (g1) and gaseous product stream (g2) are removed from reaction zone (r1) by a conduit (v) as product mixture comprising hydrocarbons. The product mixture further comprises a portion of catalyst, and the product mixture is charged to cyclone by conduit (v) for separation into a hydrocarbon stream comprising hydrocarbons, and catalyst stream (c3) which is charged to reaction zone (r2) by a conduit (vi). The hydrocarbon stream is charged to fractionator by a conduit (vii) for separation into a gas stream removed from fractionator by gas conduit, at least one liquid product stream is removed from fractionator by product conduits, and a heavy fraction is removed from fractionator by heavy fraction conduit. The heavy fraction is charged to reaction zone (r1) by a conduit (viii) which is in communication to fractionator and to reaction zone (r1) and/or reaction zone (r2) by a conduit (xi) which is communication to fractionator and to reaction zone (r2). Preferred Properties: The combined contact time of solid biomass with catalyst in reaction zone (r1) and reaction zone (r2) is 50-1000 milliseconds, preferably 100-500 milliseconds. Preferred Component: The system further has cyclone which is in fluid flow communication by conduit (v) to reaction zone (r1) and is in fluid flow communication by conduit (vi) to pyrolysis reactor at a location below the reaction zone (r1), a separation vessel which is in fluid flow communication by conduit (vii) to cyclone, and is in fluid flow communication with a gas conduit, at least two product conduits and heavy fraction conduit.