Regeneration of spent As-poisoned lead catalysts
US5942458A · kind A · utility
2Cited by
2References
13Claims
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Assignee
Inventors
Key dates
| Filing date | Aug 12, 1997 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Aug 12, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J23/92
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Spent lead catalysts containing contaminating amounts of arsenic values, e.g., mixed oxides of lead and arsenic, are regenerated and rendered suitable for reuse by heat-treating same at a temperature of at least 550.degree. C. in the presence of a gas mixture which comprises an inert gas, e.g., Ar, N.sub.2 or He, and at least 2% by volume of at least one reducing gas, e.g., H.sub.2, CO or CH.sub.4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.