| 摘要 |
In a reactor having an external shell and an internal cartridge, preferably obtained by assembling a number of stackable elementryal cartridges, each of which contains, from the outside to the inside, at least one solid wall forming a clearance with the inner wall of the shell, a continuous bottom of the solid wall, a first wall perforated over its entire length, a second inner wall only partially perforated, and a catalytic bed inserted between said bottom and said totally or partially perforated walls, at least one heat exchanger is arranged centrally and axially in a catalytic bed; the feed gases, which have cooled the outer wall of the shell, are collected in a pipe in the centre of the heat exchanger, through which pipe they run in one direction (for example downwards), then run back through the exchanger in the other direction inside the exchange tubes thereof, exiting preheated in the free zone above the free top of the catalytic bed where they are mixed with fresh gas fed directly from the outside into this zone. This mixture of preheated gas and fresh gas passes, at first axially and then radially, into the catalytic bed, is collected in the centre, is brought into contact with the outside of the heat exchanger tubes and, from the bottom thereof, is conveyed directly to the next catalytic bed.
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