PATENTS

      158.     BECK, R. A., AND MILLENDORF, A. J.  (The Texas Co.).  Process and Apparatus for Effecting Catalytic Reactions.  United States Patent 2,540,706, Feb. 6, 1951; appl. filed May 22, 1947, Serial No. 749,848; 9 claims (Cl. 260-449.6).

The invention is an improvement of United States Patent 2,501,695 (abs. 3331).  Gives apparatus for agitating catalyst particles in Fischer-Tropsch synthesis.  The upright cylindrical reactor is fitted with a helical screwlike impeller rotably supported to agitate catalyst particles furnished at its base, scooping and elevating them into the reaction zone.  A 2d short, reveresly directed, helical, screwlike impeller, progressing in the opposite rotational direction and preferably rotated with it, impinges catalyst particles lifted above the 1^st helical screw and directs them downward or laterally.  The surfaces of the first helical screw may occupy only a portion of the reaction zone, allowing gravity to take the catalyst down.  Means may be provided for directing particles projected above the reaction zone to a stripping zone.  3 United States patents cited.