US4007136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supported catalyst for the oxidation of o-xylene and/or naphthalene to phthalic anhydride
Assignee: BASF SE
•
Filing: 1975-06-30
•
Granted: 1977-02-08
•
Expires: 1995-06-30
Abstract
Abstract Supported catalyst for the oxidation of o-xylene or naphthalene to phthalic anhydride, comprising an inert carrier and the active material applied thereto, which contains from 1 to 40 per cent by weight of vanadium pentoxide, from 60 to 98.84 per cent by weight of titanium dioxide and from 0.16 to 0.6 per cent by weight, based on titanium dioxide, of rubidium in the form of rubidium oxide, the vanadium pentoxide content being from 0.05 to 4 per cent by weight, based on the (complete) catalyst.
Inventors
- 👤 Kurt Blechschmitt
- 👤 Friedrich Wirth
- 👤 Paul Hornberger
- 👤 Peter Reuter
- 👤 Gert Buerger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:57
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265; B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A supported catalyst for the oxidation of o-xylene or naphthalene to phthalic anhydride, consisting of an inert nonporous carrier to which has been applied a thin layer of an active material which contains 1 to 40 percent by weight of vanadium pentoxide, and 60 to 98.84 percent by weight of titanium dioxide, and 0.16 to 0.6 percent by weight, based on titanium dioxide, of rubidium in the form of rubidium oxide, and the vanadium pentoxide content, based on supported catalyst, being from 0.05 to 4 percent by weight.
Claim 2
Dependent Claim
88 words
A supported catalyst for the oxidation of o-xylene or naphthalene to phthalic anhydride, consisting of an inert nonporous carrier to which has been applied a thin layer of an active material which contains 1 to 40 percent by weight of vanadium pentoxide, and 60 to 98.84 percent by weight of titanium dioxide, and 0.16 to 0.6 percent by weight, based on titanium dioxide, of rubidium in the form of rubidium oxide, and the vanadium pentoxide content, based on supported catalyst, being from 0.05 to 4 percent by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |