2222. METALLGESELLSCHAFT A. G. Apparatus for Catalytic Reactions. British Patent 501,389, Feb. 27, 1939. Chem. Abs., vol. 33, 1939, p. 5710.

Apparatus comprises a spiral plate heat-exchanger in which 1 or more spiral passages contain the catalyst and constitute the reaction space, and intervening spaces contain the heat-exchange fluid.