1961. KROEPELIN, H. (Braunkohle-Benzin A.-G.). [Procedure for Emptying Granular Masses From Reaction Tubes.] German Patent 711,422, Aug. 28, 1941 (Cl. 12g-1.01). Chem. Abs., vol. 37, 1943, p. 3981.

Process is particularly applicable to emptying of contact furnaces used for the synthesis of hydrocarbons from CO and H₂ by the Fischer-Tropsch process.