US4126578A
Expired / Lapsed
US
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Sulfuric acid catalyst containing vanadium and process therefor
Assignee: Stauffer Chemical Co
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Filing: 1977-07-18
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Granted: 1978-11-21
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Expires: 1997-07-18
Abstract
Abstract A sulfuric acid catalyst is made by wetting a silica carrier having an alumina content between about 2.5 and about 5.0 percent by weight with an aqueous solution of potassium vanadate and a potassium salt of an acid having a pKa between about 3 and about 7, drying the wet carrier and then sulfating the carrier.
Inventors
- 👤 Fawzy G. Sherif
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:02
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/78; C01B17/79; B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
A process for preparing a catalyst for the oxidation of sulfur dioxide to sulfur trioxide which comprises wetting a silica carrier having an alumina content between about 2.5 and about 5.0 percent by weight with an aqueous solution of potassium vanadate and a potassium salt of an acid having a pK a between about 3 and about 7, drying the wet carrier and then sulfating the carrier.
Claim 2
Dependent Claim
67 words
A process for preparing a catalyst for the oxidation of sulfur dioxide to sulfur trioxide which comprises wetting a silica carrier having an alumina content between about 2.5 and about 5.0 percent by weight with an aqueous solution of potassium vanadate and a potassium salt of an acid having a pK a between about 3 and about 7, drying the wet carrier and then sulfating the carrier.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein said potassium salt is potassium formate, potassium citrate, potassium acetate, potassium tartarate, potassium oxalate or potassium sulfite.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein said silica carrier is a preshaped support.
Claim 5
Dependent Claim
15 words
The process of claim 3 wherein said preshaped support is impregnated with said aqueous solution.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein said aqueous solution contains between about 2.7 to about 3.1 moles of potassium per mole of vanadium.
Claim 7
Dependent Claim
32 words
The process of claim 1 wherein said potassium vanadate is employed in an amount to provide from about 5.0 to about 7.0 percent by weight V 2 O 5 in said catalyst.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein said potassium salt is potassium oxalate and said silica carrier is a preshaped support.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein said potassium salt is potassium sulfite and said silica carrier is a preshaped support.
Claim 10
Dependent Claim
9 words
The catalyst prepared by the process of claim 1.
References Cited (Backward Citations)
USRE18380E
Cited
USRE19282E
Cited
US1862825A
Cited
US2941957A
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US3018255A
Cited
US3215644A
Cited
US3448061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |