Patent US4282116A successfully refreshed from Google Patents.
US4282116A
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US
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Supported catalyst containing vanadium and titanium and/or zirconium for the preparation of phthalic anhydride
Assignee: BASF SE
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Filing: 1980-04-08
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Granted: 1981-08-04
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Expires: 2000-04-08
Abstract
Abstract A supported catalyst, containing vanadium and titanium and/or zirconium, obtained by applying a mixture of finely divided titanium dioxide and/or zirconium dioxide, and a solution or suspension of a vanadium compound, to an inert, non-porous, ring-shaped carrier having an external diameter of from 6 to 10 mm, a length of from 4 to 10 mm and a wall thickness of from 0.5 to 3 mm, the two end faces of the ring-shaped carrier being outwardly beveled at an angle such that the length of the outer cylindrical wall is at least 20% shorter than the length of the inner cylindrical wall.
Inventors
- 👤 Peter Reuter
- 👤 Kurt Blechschmitt
- 👤 Friedrich Wirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:20
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; B01J35/00; B01J35/50; B01J35/55
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
147 words
A supported catalyst containing vanadium and titanium and/or zirconium, obtained by applying a mixture of finely divided titanium dioxide and/or zirconium dioxide and a solution or suspension of a vanadium compound to an inert, non-porous, ring-shaped carrier having an external diameter of from 6 to 10 mm, a length of from 4 to 10 mm and a wall thickness of from 0.5 to 3 mm in such a way that the carrier, after drying, carries a coating from 0.05 to 1 mm thick of an active material containing from 1 to 30% by weight of vanadium pentoxide and from 70 to 99% by weight of titanium dioxide and/or zirconium dioxide, wherein the two end faces of the ring-shaped carrier are outwardly beveled at an angle such that the length of the outer cylindrical wall is at least 20% shorter than the length of the inner cylindrical wall.
Claim 2
Dependent Claim
147 words
A supported catalyst containing vanadium and titanium and/or zirconium, obtained by applying a mixture of finely divided titanium dioxide and/or zirconium dioxide and a solution or suspension of a vanadium compound to an inert, non-porous, ring-shaped carrier having an external diameter of from 6 to 10 mm, a length of from 4 to 10 mm and a wall thickness of from 0.5 to 3 mm in such a way that the carrier, after drying, carries a coating from 0.05 to 1 mm thick of an active material containing from 1 to 30% by weight of vanadium pentoxide and from 70 to 99% by weight of titanium dioxide and/or zirconium dioxide, wherein the two end faces of the ring-shaped carrier are outwardly beveled at an angle such that the length of the outer cylindrical wall is at least 20% shorter than the length of the inner cylindrical wall.
Claim 3
Dependent Claim
19 words
A supported catalyst as claimed in claim 1, wherein the beveled end faces of the ring-shaped carrier are convex.
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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |