Titanium-vanadium-tin comprising catalyst and process for the preparation of phthalic anhydride
US7557223B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2003 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Jul 8, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2523/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Catalytic compositions of oxides of titanium, vanadium and tin that are suitable for the production of phthalic anhydride by oxidizing o-xylene and/or naphthalene in the gas phase. The catalysts exhibit excellent activity and selectivity. The catalyst contains 2 to 15 percent by weight (calculated as V2O5) of vanadium, 1 to 15 percent weight (calculated as SnO2) of tin and 70 to 97 percent by weight (calculated as TiO2) of titanium. In a preferred embodiment the catalyst also contains up to 5 percent by weight (calculated as M2O) of at least one alkali metal, preferably lithium, potassium or rubidium, and more preferably cesium. In an even more preferred embodiment, cesium is present in an amount of from 0.01 to 2 percent by weight (calculated as Cs2O).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.