3553. -----[STANDARD OIL CO.]. Synthesis of Hydrocarbons. British Patent 631,682, 1949. Fuel Abs., vol. 7, 1950 abs. 2131.

Method of synthesizing hydrocarbons and oxygenated hydrocarbons that comprises feeding a mixture containing CO and H₂ to a 1^st reaction zone containing a bed of fluidized powdered Fe or Co catalyst, maintaining the 1^st reaction zone at elevated temperature and pressure, permitting the reactants to remain in the 1^st zone for enough time to effect a restricted H₂ conversion, withdrawing a crude products from the 1^st zone, cooling the product to form a condensate and gaseous fraction, withdrawing the latter from the cooling zone, charging a feed mixture comprising the gaseous fraction and containing a ration of H₂:CO higher than that in the mixture fed to the 1^st zone to a 2d reaction zone containing a bed of fluidized powdered Fe or Co catalyst at a higher temperature than that of the 1^st zone, permitting the reactants to remain in the 2d zone for enough time to effect the desired conversion, withdrawing the product from the 2d zone and causing it to pass to a cooling zone, and recovering from the cooling zone the normally liquid products formed in the 2d zone.