| 摘要 |
B 30961 Synthesis reactor and processes A reactor for catalytic gas reactions such as synthesis of methanol or ammonia comprises at least one cylindrical catalyst bed having a height not greater than half its over-all diameter and defined on its underside by a grid supported by a dished plate having peripheral mechanical connection to a downward extension of the bed wall. Preferably there are several such beds and an indirect heat exchanger upstream of the downstream-most bed. The reactor is suitably 5 - 10 m in diameter and is especially for use at under 120 bar abs. in an integrated process for producing methanol and ammonia. Referring to figure 1, outer vessel 10 contains three small catalyst beds 12A, 12B, 12C each bounded on its underside by a grid 16 supported via radial webs 20 by convex-upward dished plates 22 secured to vessel 10 at 24. Between beds 12A, 12B and 12C is a quench gas sparger 28. Under bed 12C is a chamber from which axial tube 26 leads to heat exchanger 40. The outlet of heat exchanger 40 leads via inner axial tube 42 to large catalyst bed 14 in which further reaction takes place. |
