PATENT

3386. ----- [SOCIÉTÉ CHIMIQUE DE LA GRANDE PAROISSE, AZOTE ET PRODUITS CHIMIQUES.]  [Catalytic Reactions.]  French Patent 644,266, Apr. 30-, 1927.  Chem. Abs., vol. 23, 1929, p. 1701.

In exothermic catalytic reaction in which the gases are heated indirectly before reaction by the catalyst, the gases are made to pass along 2 or more distinct heating surfaces, and the heat transmitted may be be. controlled by varying the path of the gases.