Importance

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Abstract

Cracking tubes are closed at one end and externally heated contain catalyst bodies for the catalytic cracking of process gases and also contain a central inner tube for introduction or return of the gases. Molded catalyst bodies of two different shapes are arranged in the space between the two tubes such that the two shaped bodies alternate. The molded bodies of one shape are centered at the inner tube and leave an annular space between themselves and the outer tube. The molded bodies of the other shape are constructed so as to start at the outer tube and leave an annular space between themselves and the inner tube. Thus, the process gases passing between the two tubes in contact with the catalyst bodies flows in meander fashion from the outer to the inner tube and then to the outer tube. One or both of the two molded bodies have several radial ribs for axial spacing. Each section of ribs has openings in the radial direction for flow of gases between the outer surface of the inner tube and the inner surface of the outer tube.

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First Claim