US4149992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing an oxidation catalyst
Assignee: Huntsman Corp
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Filing: 1976-06-21
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Granted: 1979-04-17
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Expires: 1996-06-21
Abstract
Abstract In a method for preparing a phosphorus-vanadium-oxygen catalyst wherein a pentavalent vanadium compound and a trivalent phosphorus compound are brought together in a liquid reaction zone under conditions to provide a substantial amount of tetravalent vanadium and to form a phosphorus-vanadium-oxygen catalyst precursor having a phosphorus to vanadium atom ratio between about 0.9:1 and about 2:1, the improvement of this invention comprises adding a sufficient amount of a surfactant to the liquid reaction zone to form a dispersion which comprises a liquid, the surfactant and a dispersoid of the phosphorus-vanadium-oxygen catalyst precursor.
Inventors
- 👤 Ramon A. Mount
- 👤 Harold Raffelson
- 👤 Warn D. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:24
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J23/00; B01J23/16; B01J23/20; B01J23/22; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
In a method for preparing a phosphorus-vanadium-oxygen catalyst wherein a pentavalent vanadium compound and a trivalent phosphorus compound are brought together with a chemically inert liquid in a reaction zone under conditions to provide a substantial amount of tetravalent vanadium and to form a phosphorus-vanadium-oxygen catalyst precursor having a phosphorus to vanadium atom ratio between about 0.9:1 and about 2:1, the improvement which comprises adding at least about 0.01 weight percent, based on the total weight of the slurry of a surfactant selected from the group consisting of anionic, nonionic, zwitterionic and amphalytic compounds and mixtures thereof to the reaction zone to form a finely divided phosphorus-vanadium-oxygen catalyst precursor.
Claim 2
Dependent Claim
109 words
In a method for preparing a phosphorus-vanadium-oxygen catalyst wherein a pentavalent vanadium compound and a trivalent phosphorus compound are brought together with a chemically inert liquid in a reaction zone under conditions to provide a substantial amount of tetravalent vanadium and to form a phosphorus-vanadium-oxygen catalyst precursor having a phosphorus to vanadium atom ratio between about 0.9:1 and about 2:1, the improvement which comprises adding at least about 0.01 weight percent, based on the total weight of the slurry of a surfactant selected from the group consisting of anionic, nonionic, zwitterionic and amphalytic compounds and mixtures thereof to the reaction zone to form a finely divided phosphorus-vanadium-oxygen catalyst precursor.
Claim 3
Dependent Claim
30 words
In a process of claim 1 wherein the amount of surfactant is between about 0.01 weight percent and about 0.5 weight percent, based on the total weight of the slurry.
Claim 4
Dependent Claim
29 words
In a process of claim 1 wherein the amount of surfactant is between about 0.05 weight percent and about 0.2 weight percent, based on the weight of the slurry.
Claim 5
Dependent Claim
20 words
In a process of claim 1 wherein the phosphorus to vanadium atom ratio is between about 1:1 and about 1.2:1.
Claim 6
Dependent Claim
13 words
In a process of claim 1 wherein the surfactant is a nonionic surfactant.
Claim 7
Dependent Claim
18 words
In a process of claim 1 wherein the surfactant is nonylphenol reacted with about 9 moles ethylene oxide.
Claim 8
Dependent Claim
14 words
In a process of claim 1, wherein said trivalent phosphorus compound is phosphorous acid.
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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) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |