Method for recovering platinum in a nitric acid plant
AssigneeEngelhard Corporation
InventorsW. Robert Hatfield, Ronald M. Heck, Thomas H. Hsiung
Life of this patent
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Abstract
Improved recovery of platinum lost from the catalyst gauze in a nitric acid plant is obtained by using palladium containing recovery gauzes configured to enhance the mass transfer characteristics of the system.
Claims16
A method for the recovery of platinum and/or rhodium lost from a platinum-containing catalyst during ammonia oxidation processes at temperatures above 850.degree. C.;
- which comprises bringing said lost platinum and/or rhodium into contact with a foraminate element fabricated from material consisting essentially of palladium characterized by (a) a novel configuration whereby the initial product of mesh size (N) and wire diameter (d.sub.w) for said element is greater than at least about 0.3 and (b) where, for a given nitrogen throughput, the weight recovery efficiency (.eta.') is a function of the wire diameter (d.sub.w) and mesh size (N) combination and weight recovery efficiency is improved by increasing mesh size (N) for a given wire diameter or increasing the wire diameter (d.sub.w) for a given mesh size.
In the method for the recovery of platinum and/or rhodium lost from a platinum-containing catalyst during ammonia oxidation processes at temperatures above 850.degree. C. by bringing said lost platinum and /or rhodium into contact with a foraminate element;
- the imrovement which comprises utilizing for recovery purposes a foraminate element fabricated from a material consisting essentially of palladium, characterized by (a) a novel configuration whereby the initial product of mesh size (N) and wire diameter (d.sub.w) for said element is greater than at least about 0.3 and (b) where, for a given nitrogen throughput, the weight recovery efficiency (.eta.') is a function of the wire diameter (d.sub.w) and mesh size (N) combination and weight recovery efficiency is improved by increasing the mesh size (N) at a given wire diameter or increasing the wire diameter (d.sub.w) at a given mesh size.
Dependencies are inferred from the claim text.