US3894971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation catalysts
Assignee: BASF SE
•
Filing: 1973-03-15
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Granted: 1975-07-15
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Expires: 1993-03-15
Abstract
Abstract A catalyst for the oxidation of aromatic or unsaturated aliphatic hydrocarbons which contains in the active material from 60 to 99 percent by weight of titanium dioxide and/or zirconium dioxide, from 1 to 40 percent by weight of vanadium pentoxide and up to 6 percent by weight of combined phosphorus, and which contains from 0 to 0.3 percent by weight of phosphorus in the outer layer and more than 0.3 percent up to 6 percent by weight of phosphorus in the remaining catalytic material.
Inventors
- 👤 Peter Reuter
- 👤 Friedrich Wirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:35
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; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J37/00; B01J37/02; B01J37/0215; B01J37/0221; B01J37/0228; C07C46/00; C07C46/02; C07C46/04; C07C51/25; C07C51/252; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
185 words
A MULTI-LAYER CATALYST FOR THE OXIDATION OF AROMATIC OR UNSATURATED ALIPHATIC HYDROCARBONS CONSISTING OF AN INERT CARRIER IN SPHERICAL FORM HAVING A DIAMETER OF FROM 4 TO 12 MM. TO WHICH THERE IS APPLIED AT LEAST TWO LAYERS OF A CATALYTICALLY ACTIVE MATERIAL OF A OTAL THICKNESS OF FROM 0.02 TO 2 MM., SAID ACTIVE MATERIAL CONSISTING ESSENTIALLY OF A. FROM 60 TO 99 PERCENT BY WEIGHT OF TITANIUM DIOXIDE AND/OR ZIRCONIUM DIOXIDE, B. FROM 1 TO 40 PERCENT BY WEIGHT OF VANADIUM PENTOXIDE AND C. BASED ON THE TOTAL AMOUNT OF TITANIUM DIOXIDE, ZIRCONIUM DIOXIDE AND VANADIUM PENTOXIDE, UP TO 6% BY WEIGHT OF PHOSPHORUS IN THE FORM OF A PHOSPHORUS COMPOUND, WHEREIN THE CATALYTICALLY ACTIVE MATERIAL IN THE OUTER LAYER OF THE CATALYST CONTAINS FROM 30 TO 0.3 PERCENT BY WEIGHT OF PHOSPHORUS WHILE THE REMAINDER OF SAID ACTIVE MATERIAL CONTAINS MORE THAN 0.3 PERCENT BY WEIGHT OF PHOSPHORUS, THE AMOUNT OF THE OUTER LAYER OF THE CATALYTICALLY ACTIVE MATERIAL WHICH CONTAINS FROM 0 TO 0.3 PERCENT BY WEIGHT OFPHOSPHORUS BEING NOT MORE THAN HALF OF THE TOTAL AMOUNT OF SAID ACTIVE MATERIAL.
Claim 2
Dependent Claim
185 words
A MULTI-LAYER CATALYST FOR THE OXIDATION OF AROMATIC OR UNSATURATED ALIPHATIC HYDROCARBONS CONSISTING OF AN INERT CARRIER IN SPHERICAL FORM HAVING A DIAMETER OF FROM 4 TO 12 MM. TO WHICH THERE IS APPLIED AT LEAST TWO LAYERS OF A CATALYTICALLY ACTIVE MATERIAL OF A OTAL THICKNESS OF FROM 0.02 TO 2 MM., SAID ACTIVE MATERIAL CONSISTING ESSENTIALLY OF A. FROM 60 TO 99 PERCENT BY WEIGHT OF TITANIUM DIOXIDE AND/OR ZIRCONIUM DIOXIDE, B. FROM 1 TO 40 PERCENT BY WEIGHT OF VANADIUM PENTOXIDE AND C. BASED ON THE TOTAL AMOUNT OF TITANIUM DIOXIDE, ZIRCONIUM DIOXIDE AND VANADIUM PENTOXIDE, UP TO 6% BY WEIGHT OF PHOSPHORUS IN THE FORM OF A PHOSPHORUS COMPOUND, WHEREIN THE CATALYTICALLY ACTIVE MATERIAL IN THE OUTER LAYER OF THE CATALYST CONTAINS FROM 30 TO 0.3 PERCENT BY WEIGHT OF PHOSPHORUS WHILE THE REMAINDER OF SAID ACTIVE MATERIAL CONTAINS MORE THAN 0.3 PERCENT BY WEIGHT OF PHOSPHORUS, THE AMOUNT OF THE OUTER LAYER OF THE CATALYTICALLY ACTIVE MATERIAL WHICH CONTAINS FROM 0 TO 0.3 PERCENT BY WEIGHT OFPHOSPHORUS BEING NOT MORE THAN HALF OF THE TOTAL AMOUNT OF SAID ACTIVE MATERIAL.
Claim 3
Dependent Claim
43 words
A catalyst as claimed in claim 1 wherein the catalytically active material in the outer layer contains from 0 to 0.25 percent by weight of phosphorus and the remainder of the catalytic material contains from 0.35 to 6 percent by weight of phosphorus.
Claim 4
Dependent Claim
25 words
A catalyst as claimed in claim 1 wherein the thickness of the outer layer of said catalytically active material is about 0.01 to 1 mm.
Claim 5
Dependent Claim
117 words
A catalyst as claimed in claim 1 wherein the catalytically active material in the inner layer contains from 60 to 94 percent by weight of titanium dioxide and/or zirconium dioxide, from 6 to 40 percent by weight of vanadium pentoxide and, based on the total amount of titanium dioxide, zirconium dioxide and vanadium pentoxide, more than 0.3 up to 6 percent by weight of phosphorus and in the outer layer contains from 85 to 99 percent by weight of titanium dioxide and/or zirconium dioxide, from 1 to 15 percent by weight of vanadium pentoxide and, based on the total amount of titanium dioxide, zirconium dioxide and vanadium pentoxide, from 0 to 0.3 percent by weight of phosphorus.
Claim 6
Dependent Claim
18 words
A catalyst as claimed in claim 1 in which there are two layers of said catalytically active material.
Claim 7
Dependent Claim
18 words
A catalyst as claimed in claim 1 in which there are three layers of said catalytically active material.
Claim 8
Dependent Claim
22 words
A catalyst as claimed in claim 1 wherein said inert carrir has an internal surface area of from 0 to 3 m2/g.
Claim 9
Dependent Claim
34 words
A catalyst as claimed in claim 7 wherein said inert carrier consists essentially of a material selected from the group consisting of quartz, porcelain, fused aluminum oxide, silicon carbide and fused or sintered silicates.
Claim 10
Dependent Claim
49 words
A catalyst as claimed in claim 7 wherein the titanium dioxide is in the form of anatase having an internal surface area of 5 to 30 m2/g and the zirconium dioxide has an internal surface area of 2 to 25 m2/g, both oxides being used in finely divided form.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |