Return to Abstracts of Patents Return to Abstracts of Patents 250-499 Patent Abstracts463. ------. [DART, J. C.]. (Standard Oil Development Co.). Hydrocarbon Synthesis Process. United States Patent 2,586,618. Feb. 19, 1952; appl. filed Nov. 8, 1946, Serial No. 708,627; 3 claims (Cl. 260-449.6). Hydrocarbons are synthesized from CO and H2 in the presence of an Fe catalyst, the temperature in the reaction zone being 350º-750º F. and the pressure 50-700 p. s. i. The particles of catalyst are of a size 0-200 microns and higher and are maintained in a fluidized state by means of upflowing suspending gases having a velocity of 0.1-5 ft. per sec. In operations of this character, the disadvantage is that the products of reaction are, for example, H2O and CO2. As the H2 and CO of the synthesis gas charge are consumed and H2O and CO2 are produced, the gas atmosphere changes from reducing to oxidizing, and the catalyst deteriorates. It is now found that substantial improvements in the reaction are secured by withdrawing a vaporous stream from the reaction zone at a point between the point of introduction of the feed gases and the point of withdrawal of the synthesized hydrocarbons, removing both the H2O and the CO2 therefrom and recycling the treated gas stream to the reaction zone. |