486. DICKINSON, N. L. (M. W. Kellogg Co.). Process and Apparatus for the Synthesis of Organic Compounds. United States Patent 2,481,089, Sept. 6, 1949; appl. filed Mar. 6, 1947, Serial No. 732,846; 15 claims (Cl. 260-449.6). Chem. Abs., vol. 44, 1950,

Patent Abstracts

486. DICKINSON, N. L. (M. W. Kellogg Co.). Process and Apparatus for the Synthesis of Organic Compounds. United States Patent 2,481,089, Sept. 6, 1949; appl. filed Mar. 6, 1947, Serial No. 732,846; 15 claims (Cl. 260-449.6). Chem. Abs., vol. 44, 1950, p. 1673.

As a modification of United States Patent Application 726,620, filed February 5, 1947, by L. R. Hill and H. G. McGrath, a multiple-stage process for the synthesis of organic compounds is given. 2 steps (namely the sorption of CO on the catalyst and the hydrogenation of the sorbed CO and the growth of C-C chains), take place in the first reaction zone. The stabilization and desorption of the resulting synthesized organic molecules from the catalyst takes place in the 2d zone. The linear velocity of the gas passing through the 1^st zone is at least 6 ft. per sec., preferably 8-40 ft. per sec. The temperature is 300º-600º F. The gaseous effluent from the 1^st zone passes to a 2d zone where the average temperature is raised at least 25º F. to at least 100º F. above the outlet temperature of the 1^st zone. Generally the pressure in the 1^st stage is less than 500 p. s. i., preferably 80-400 p. s. i. for the Fe catalyst. The catalyst concentration is usually 1-18 lb. per ft.³ of gas. Usually less than 5-7 sec. Contact per pass of the gasses with the catalyst in the 1^st zone is enough to produce the desired organic product. The cross-sectional area of any individual tube in the reactor is less than 2.5 in. in diameter and may be less than 1 in. Partial pressures in the 2d zone are usually lower than in the 1^st. The entrained catalyst is a finely powdered metal or metal oxide. The catalyst is separated from the gaseous effluent from the 2d zone. The gases are cooled and condensed for recovery of the organic compounds. 6 United States patents cited.