| CPC C01C 1/0417 (2013.01) [B01J 8/0469 (2013.01); B01J 8/0496 (2013.01); C01C 1/0411 (2013.01); C01C 1/0482 (2013.01); B01J 2208/0053 (2013.01); B01J 2208/00168 (2013.01); B01J 2208/00371 (2013.01)] | 24 Claims |
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1. An ammonia synthesis converter comprising:
a shell having a removable top head;
an annular basket removably mounted in the shell, the annular basket comprising inner and outer walls and defining an annular zone between the inner and outer walls, an inner basket zone located centrally within the inner wall and an outer basket zone between the outer wall and the shell;
first and second catalyst beds disposed in the annular zone of the basket for axial down-flow in series, the first and second catalyst beds comprising catalyst to convert a mixture of hydrogen and nitrogen to ammonia;
an insert received in the annular basket, the insert comprising the first catalyst bed, the insert removable from the annular basket, the insert comprising an interbed quench system;
a quench gas supply to the interbed quench system in the insert to introduce quench gas into a first effluent from the first catalyst bed and a flow path to introduce the resulting mixture of the quench gas and the first effluent into a top of the second catalyst bed;
a feed-effluent interchanger in the inner basket zone to receive a second effluent from the second catalyst bed and indirectly heat a gas feed mixture to the first catalyst bed;
a bypass gas distributor to introduce exchanger bypass gas into the heated gas feed mixture to the first catalyst bed and a flow path to introduce the resulting bypass-feed mixture into a top of the first catalyst bed; and
a flow path to supply the gas feed mixture through the outer basket zone to the interchanger.
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