PATENT

3417. ----- [SOCIÉTÉ L’AIR LIQUIDE.]  Ammonia Synthesis.  British Patent 307,039, Mar. 2, 1928.  Chem. Abs., vol. 23, 1929, p. 5280.

In NH₃ synthesis or other exothermic catalytic gas reactions, preliminary purification of the gases is effected in a container surrounded by the catalyst for the main reaction so that indirect heat exchange occurs and the temperature of the purifying reactions is thus controlled:  for example, in removing O₂ and Co by catalytic hydrogenation from gases for NH₃ synthesis.  Describes an apparatus. 

See also British Patent 305,534 (abs. 3416).