A fluidized bed reactor was used for fast pyrolysis. The 30 cm single zone split tube furnace was placed to heat the main tube reactor made of AISI 316 stainless steel. The tube reactor was of the size 7.6 cm diameter and 84 cm long. A K-type thermocouple and a pressure gauging tube were located at the bottom bed, and another thermocouple and gauge were placed at the upper bed. An inert gas, nitrogen, was used for the fluidization of the bed material of Mulgrain 47–10 × 18 (C E Minerals, Andersonville, GA), which used for the previous gasification studies [20] and [21]. The bed material was sieved using −20 and + 40 mesh sieve pans (ASTM E-11 specification, Fisher Scientific Company, USA). The average density and mean diameter were 1.45 g/mL and 630 μm, respectively. The height of the bed material was 33 cm. The ground rice straw sample was inserted into the main reactor through a 4 cm diameter screw auger feeding system connected to the hopper. The feed rate was set at 5 g/min. Two-stage TAMU cyclones, designed for the pyrolysis process, were connected to the end of the reactor to remove the solid product. The bio-oil was condensed in a six-staged condenser; the first canister was empty, whereas the others contained solvents (acetone). The incondensable gas was passed through the gas meter, and the gas samples were collected and analyzed using a GC-TCD.