Catalyst or sorbent beds
AssigneeJohnson Matthey PLC
InventorsSean Alexander Axon, Andrew Mark Ward, Alan Bruce Briston
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Abstract
A fixed bed containing a particulate catalyst or sorbent material (10) subject to operation at high temperature having a shaped boundary member (16) inclined to the direction of fluid flow through the bed that maintains the depth of said catalyst or sorbent at the boundary of the bed through a series of thermal expansion-thermal contraction cycles is described. By maintaining bed depth, the shaped boundary member (16) can prevent bypass of, e.g. ammonia through a bed of particulate ammonia oxidation catalyst.
Claims12
A fixed bed through which a process fluid may flow, disposed in a vessel, said bed having a depth less than the diameter of the vessel and between 5 and 500 mm, comprising a particulate material disposed on a perforate member and bounded by a process fluid impermeable boundary member extending for at least substantially the depth of the bed wherein said boundary member is not fixed to the perforate member and at least a part of said boundary member bounds said particulate material for at least substantially the depth of the bed at an overall angle between 20 and 70 degrees to the direction of fluid through said bed.
A fixed bed through which a process fluid may flow, disposed in a vessel, said bed having a depth less than the diameter of the vessel and between 5 and 500 mm, comprising a particulate material disposed on a perforate member and bounded by a process fluid impermeable boundary member for at least substantially the depth of the bed wherein said boundary member comprises an upstream end fixed to a vessel wall and a downstream end free of attachment and at least a part of said boundary member bounds said particulate material for at least substantially the depth of the bed at an overall angle between 20 and 70 degrees to the direction of fluid flow through said bed, and wherein said boundary member further comprises at least one step comprising a facet extending at an angle of about 90 degrees to the direction of fluid flow through the bed.
Dependencies are inferred from the claim text.