1969. ------. [KRUPP TREIBSTOFFWERK G. m. b. H.] [Multistage Synthesis.] German Patent Appl. K 148,919, filed Dec. 20, 1937 (Cl. IV b-12 g). PB Report 412, May 15, 1945.

Carrying out Fischer-Tropsch synthesis, or other reactions with large heat effects, in a plurality of stages and introducing between stages enough cold charge gas to hold the desired temperature in the subsequent stage.