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US4100106A
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Process for the production of a mixed-oxide oxidation catalyst containing vanadium and pentavalent phosphorus
Assignee: Lonza AG
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Filing: 1976-01-12
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Granted: 1978-07-11
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Expires: 1996-01-12
Abstract
Abstract The process for the production of a mixed-oxide oxidation catalyst which, based on the vanadium and pentavalent phosphorus, has an atomic ratio of phosphorus to vanadium between 1.05 to 1 and 1.10 to 1. The process involves reacting a salt of tetravalent vanadium, dissolved in a non-oxidizing acid aqueous solution, with orthophosphoric acid. The resultant soluble vanadium salt complex, after concentrating the solution is precipitated by adding water. The precipitate is dried. The dried precipitate is put or formed into the desired form. The formed, dried precipitate is subjected to a heat treatment of at least 300° C. A mixed-oxide oxidation catalyst is obtained.
Inventors
- 👤 Giancarlo Stefani
- 👤 Pietro Fontana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:38
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B; B01; B01J; B01J23/00; B01J23/002; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C07C51/215; B01J2523/00; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
103 words
The process for the production of a mixed-oxide oxidation catalyst, which, based on the vanadium and pentavalent phosphorus, has an atomic ratio of phosphorus to vanadium between 1.05 to 1 and 1.10 to 1, by reacting a salt of the tetravalent vanadium, dissolved in a concentrated non-oxidizing acid aqueous solution with orthophosphoric acid forming a vanadium-phosphorus-oxide-complex, isolating the complex, putting the dried complex into the desired form and subjecting the formed catalyst material to a heat treatment of at least 300° C., the improvement which comprises the step of isolating the vanadium-phosphorus-oxide-complex by precipitating the complex by adding water to the concentrated solution.
Claim 2
Dependent Claim
103 words
The process for the production of a mixed-oxide oxidation catalyst, which, based on the vanadium and pentavalent phosphorus, has an atomic ratio of phosphorus to vanadium between 1.05 to 1 and 1.10 to 1, by reacting a salt of the tetravalent vanadium, dissolved in a concentrated non-oxidizing acid aqueous solution with orthophosphoric acid forming a vanadium-phosphorus-oxide-complex, isolating the complex, putting the dried complex into the desired form and subjecting the formed catalyst material to a heat treatment of at least 300° C., the improvement which comprises the step of isolating the vanadium-phosphorus-oxide-complex by precipitating the complex by adding water to the concentrated solution.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said precipitated complex is filtered from said water-diluted solution.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein the vanadium phosphorus salt complex is obtained by boiling of the tetravalent vanadium salt in a mixture of concentrated aqueous hydrochloric acid and 85 percent orthophosphoric acid.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the acid aqueous solution additionally contains oxalic acid.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the acid aqueous solution is acidified with hydrochloric acid.
Claim 7
Dependent Claim
16 words
The process of claim 8 wherein oxalic acid is also present in the acid aqueous solution.
Claim 8
Dependent Claim
22 words
The process of claim 1 wherein the atomic ratio of phosphorus to vanadium in the starting solution is about 1.08 to 1.
Claim 9
Dependent Claim
26 words
The process of claim 1 wherein the soluble salt of the tetravalent vanadium is obtained by the in situ reduction of a compound of pentavalent vanadium.
Claim 10
Dependent Claim
14 words
The process of claim 11 wherein the compound of pentavalent vanadium is vanadium pentaoxide.
Claim 11
Dependent Claim
25 words
The process of claim 1 wherein the heat treatment step is conducted at a temperature of 350° to 650° C. for 2 to 24 hours.
Claim 12
Dependent Claim
25 words
The process of claim 1 wherein the heat treatment step is conducted at a temperature of 400° to 550° C. for 4 to 12 hours.
Claim 13
Dependent Claim
17 words
The process of claim 1 wherein the heat treatment step is conducted in the presence of air.
Claim 14
Dependent Claim
20 words
The process of claim 28 wherein the heat treatment step is conducted with at least a partial exclusion of oxygen.
Claim 15
Dependent Claim
42 words
The process of claim 1 wherein, during the production process, titanium dioxide is added as a further component, enough titanium dioxide being added so that the portion of titanium dioxide in the mixed-oxide oxidation catalyst is up to 20 percent by weight.
Claim 16
Dependent Claim
52 words
The process of Claim 1 wherein, during the catalyst production process, titanium dioxide is added as a further component to the dried precipitate before the heat treatment step, enough titanium dioxide being added so that the portion of titanium dioxide in the mixed-oxide oxidation catalyst is up to 20 percent by weight.
Claim 17
Dependent Claim
23 words
The process of Claim 15 wherein the titanium dioxide and the dried precipitate were made into a paste by the addition of water.
Claim 18
Dependent Claim
22 words
The process of Claim 15 wherein the titanium dioxide, in the form of an aqueous paste, is admixed with the dried precipitate.
Claim 19
Dependent Claim
31 words
The process of Claim 15 wherein enough titanium dioxide is added so that the portion of titanium dioxide in the mixed-oxide oxidation catalyst is between 1 and 5 percent by weight.
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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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |