2936.---- [RUHRCHEMIE A. G.] Improvements in and Relating to Apparatus for Carrying out Catalytic Gas Reactions Sensitive to Changes in Temperatures. British Patent Appl. 29,546, filed 1938.

Refers specifically to catalyst masses in annular containers that are disposed concentrically with respect to the reaction furnace, the container being formed by hollow bodies that are disposed concentrically with respect to the reaction furnaces at suitable distances apart and traversed by a heating or cooling medium and in which the annular container through which passes the heating or cooling medium is formed by separate closure parts provided with supply and discharge pipes for the heating and cooling medium.