Method for regenerating phosphorus-molybdenum-alkali containing oxidation catalyst
US4707460A · kind A · utility
6Cited by
6References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1986 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Jun 4, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for regenerating a spent oxidation catalyst useful in the production of unsaturated carboxylic acids by vapor-phase oxidation of unsaturated aldehydes, the catalyst containing, at least, phosphorus, molybdenum, and an alkali metal(s), which method comprises dissolving and/or suspending the spent catalyst in a liquid composition, wherein the contents of ammonium ion and nitrate ion are controlled to be from 7 to 15 moles and from 0.1 to 4.0 moles, respectively, per 12 gram atoms of molybdenum, and immediately thereafter mixing the spent catalyst and the liquid composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.