Catalyst or sorbent beds

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.

Description

technical field [0001] The present invention relates to a fixed bed of catalyst or adsorbent, in particular to a device for increasing the efficiency of the bed by maintaining the thickness of the bed through a series of thermal expansion-thermal contraction cycles. Background technique [0002] A fixed bed generally comprises at least one layer of catalyst or adsorbent in the form of granular material in the form of extrudates, pellets or pellets bounded by process fluid-impermeable boundary elements and arranged in a perforated On elements, such as perforated plates, grids or meshes, treatment fluid passing through the bed can pass through said perforated elements. The bed is disposed within a vessel wherein the bed is supported directly by the vessel wall, eg by lugs, or by process fluid impermeable bed support means such as a basket or frame attached to the vessel wall. [0003] The boundary elements may or may not be fixed to the perforated element. However, the bound...

AI Technical Summary

Problems solved by technology

[0006] Increased flow through the bed reduces contact time between fluid and catalyst or adsorbent and can lead to fluid bypass problems

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