153. BAYERISCHE STICKSTOFF-WERKE A. G. Improved Process for Making Carbon Black and Hydrogen or Hydrogen-Containing Gases. British Patent 493,929, Jan. 11, 1937.

C₂H₂ or waste gases, for example from coal hydrogenation or benzine synthesis, are thermally cracked with or without additional substances, for example, Fe(CO)₅, and the cracking products chilled directly after their formation.