Regeneration of spent hydrodesulfurization catalysts employing presulfiding treatment and heteropoly acids
US4272400A · kind A · utility
9Cited by
8References
25Claims
0Family size
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Key dates
| Filing date | Jul 19, 1979 |
| Grant date | Jun 9, 1981 |
| Priority date | — |
| Expiry date | Jul 19, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S502/516
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The removal of metals, especially vanadium, from spent hydrofining catalyst is accomplished by a two-step process. Treatment with a gaseous sulfur-containing reagent brings the metals to the surface of the catalyst and converts them to sulfides, which are then efficiently removed by contact with a heteropoly acid such as molybdophosphoric acid. Treatment of deactivated hydrodesulfurization catalysts such as Co-Mo supported on alumina by this process results in substantially complete regeneration of catalytic activity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.