US4849189A
Expired / Lapsed
US
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Vandium recovery process
Assignee: Shell Internationale Research Maatschappij BV
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Filing: 1986-11-18
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Granted: 1989-07-18
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Expires: 2006-11-18
Abstract
Abstract A process for the preparation of pentavalent vanadium compounds from acid extracts obtained by regenerating spent catalysts which contain vanadium, this process comprising the successive steps of (1) oxidizing extracts containing tri- and tetravalent vanadium with an oxygen-containing gas at a pH of at least 0.7 to 1.4 po and at most 2.3-1.4 po to form a solution of tetravalent vanadium compounds, and (2) continuing the oxidation at a pH lying in the range of from 3.2-1.4 po to 2.3-1.4 po to form concentrates of pentavalent vanadium having a partial oxygen pressure, 0.05 MPa.
Inventors
- 👤 Just J. C. Jansz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:58
CPC Classifications
C; C01; C01G; C01G31/00; C22; C22B; C22B34/00; C22B34/20; C22B34/22; C22B34/225; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
A process for the preparation of pentavalent vanadium compounds from acid extracts obtained by regenerating spent catalysts which contain vanadium, comprising the steps of: oxidizing extracts containing tri- and tetravalent vanadium with an oxygen-containing gas a pH of at least 0.7-1.4 P o and at most 2.3-1.4 P o to form a solution of tetravalent vanadium compounds; and continuing the oxidation at a pH lying in the range of from 3.2-1.4 P o to 2.3-1.4 P o , wherein the partial oxygen pressure is at least 0.05 MPa, and in the copresence of ferric compounds in an amount corresponding with an anionic ratio of vanadium.
Claim 2
Dependent Claim
105 words
A process for the preparation of pentavalent vanadium compounds from acid extracts obtained by regenerating spent catalysts which contain vanadium, comprising the steps of: oxidizing extracts containing tri- and tetravalent vanadium with an oxygen-containing gas a pH of at least 0.7-1.4 P o and at most 2.3-1.4 P o to form a solution of tetravalent vanadium compounds; and continuing the oxidation at a pH lying in the range of from 3.2-1.4 P o to 2.3-1.4 P o , wherein the partial oxygen pressure is at least 0.05 MPa, and in the copresence of ferric compounds in an amount corresponding with an anionic ratio of vanadium.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, wherein the partial oxygen pressure is form 0.07 to 0.5 MPa.
Claim 4
Dependent Claim
21 words
The process as claimed in claim 1, wherein the temperature during the first oxidation step is from 15° to 70° C.
Claim 5
Dependent Claim
21 words
The process as claimed in claim 1, wherein the temperature during the continued oxidation step is from 70° to 110° C.
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US4436706A
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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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |