2042. ------. [LEWIS, W. K.] (Standard Oil Development Co.). Temperature Control Means. United States Patent 2,474,583, June 28, 1949; appl. filed Jan. 19, 1946, Serial No. 642,397; 6 claims (Cl. 260-449.6). Chem. Abs., vol. 43, 1949, p. 6478.

Describes method for abstracting heat from a system comprising a lower dense phase and an upper dilute phase suspension of powdered catalyst in a gas. In one modification the catalyst to be cooled is passed through a drum, either vertical or horizontal, in such a way as to maintain a dense bed of catalyst in the drum. At the top part of the drum above the dense bed are boiler tubes in which steam is generated. A liquid product of proper boiling range is injected into the drum. The liquid, on falling on the dense bed, is immediately vaporized by the hot catalyst, which is thereby cooled. The vapors rise to the top part of the drum where they are condensed on the boiler tubes and the cycle continued indefinitely. In a calculation of the necessary heat transfer surface to abstract the heat from the reaction zone for a hydrocarbon synthesis plant producing 10,000 bbl. liquid hydrocarbons per day, the figure of 26,700 sq. ft. for this method is compared to 228,000 sq. ft. for boiler tubes disposed within the dense phase. 1 foreign patent and 9 United States patents cited.

------. See abs. 1959.