Two-stage calcination for catalyst production
US8097557B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2006 |
| Grant date | Jan 17, 2012 |
| Priority date | — |
| Expiry date | Sep 24, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J37/0201
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to an improved process for producing a catalyst useful for the epoxidation of ethylene to ethylene oxide. In forming the catalyst, a silver-impregnated support is subjected to two calcinations. The support is subjected to a first calcination in a first atmosphere comprising air. Next the support is subjected to a second calcination in a second atmosphere which is substantially entirely comprised of inert gas, and which second atmosphere is substantially absent of hydrogen. This two-stage calcination produces an improved catalyst which contains fewer organics left over under standard conditions of air calcination alone, while costing less than calcination in an inert gas alone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.