SECTION I(b)
(13) New Reactor Design
(a) “Taschenrohrofen” (See reference I(b)/39 at end of this section).
This oven is a regular MP Fischer oven. Instead of using the conventional double tubes, the tubes are large and contain a number of internal tube fins, which intersect the tube in such a manner that no catalyst particle is more than 5 mm. from the nearest fin or tubewall. 16 ovens of this type were installed in the 2nd stage of the Krupp plant at Wanne-Eickel. (There were also 8 regular double tube ovens in the plant).
A detailed drawing of the oven is attached. Each tube 75 mm. diameter and 3750 mm. long, contained 0.01275 m3 of catalyst, the entire oven contained the conventional 10 m3. The watercooled surface is 0.85 m2/tube (670 m2/oven). The finned surface is 2.13 m2/tube (1670 m2/oven).
It was stated that the catalyst was not easily removed from these tubes. The capacity of the oven as a unit was comparable to the double tube oven.