| 摘要 |
<FORM:1079643/C1/1> Gaseous phase chemical reactions, for example the synthesis of ammonia from nitrogen and hydrogen are carried out in apparatus comprising cylindrical outer shell 17 containing heat-exchanger 23 at its bottom and a plurality of catalyst beds 18 to 22 above the heat-exchanger, the catalyst receptacles being spaced from the inner wall of shell 17 and gases entering at 3 flowing downwardly through the annular space so formed, upwardly through the heat-exchanger 23 and conduit 32 to the uppermost catalyst bed, downwardly through the catalyst beds and the tubes 31 of the heat-exchanger and out at 16. A first cold shot is introduced at 4 and flows upwardly in conduit 34 to mix with the main gas stream in upper conduit 32. A cold shot is also introduced into the gases leaving at least one catalyst bed other than the last, the cold shot entering circumferential manifold (37) by pipe (5) and passing with the downwardly flowing gas stream through notches (40) is baffle plate (38) to the catalyst bed below. |
