218. ------. [BRAUNKOHLE-BENZIN, A. G.] [Catalyst Removal.] German Patent Appl. B 184,450, filed Aug. 27, 1938 (Cl. IV b-12 g). PB Rept. 412, May 15, 1945.

Patent Abstracts

218. ------. [BRAUNKOHLE-BENZIN, A. G.] [Catalyst Removal.] German Patent Appl. B 184,450, filed Aug. 27, 1938 (Cl. IV b-12 g). PB Rept. 412, May 15, 1945.

Catalyst ovens or tubes are emptied of catalyst by suddenly applying a gas pressure of 5-20 atm., preferably after wetting the pressure side of the catalyst bed with a liquid.