US4515757A
Expired / Lapsed
US
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Stripping a solution containing molybdenum, tungsten and/or vanadium values
Assignee: Chevron USA Inc
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Filing: 1984-02-22
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Granted: 1985-05-07
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Expires: 2004-02-22
Abstract
Abstract A method of stripping an organic extraction solvent containing quaternary alkyl ammonium complexes. The extraction solvent is contacted with an aqueous stripping solution having at least 75 g/l bicarbonate ion, while maintained at between pH 7 and 9 at a temperature of no more than 50 DEG C.
Inventors
- 👤 Gale L. Hubred
- 👤 Dean A. Van Leirsburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:54
CPC Classifications
C; C01; C01G; C01G53/00; C01G53/12; B; B01; B01J; B01J23/00; B01J23/90; B01J23/94; C01G31/00; C01G31/003; C01G39/00; C01G39/003; C01G41/00; C01G41/003; C01G51/00; C01G51/01; C01G51/20; C01G53/01; C22; C22B; C22B23/00; C22B23/005; C22B23/02; C22B23/026; C22B23/04; C22B23/0407; C22B23/0446; C22B23/0453; C22B23/0461; C22B3/00; C22B3/20; C22B3/26; C22B3/28; C22B3/288; C22B3/30; C22B3/306; C22B34/00; C22B34/20; C22B34/22; C22B34/30; C22B34/34; C22B7/00; C22B7/006; C22B7/008; C22B7/009; C01P; C01P2002/00; C01P2002/80; C01P2002/82; C01P2006/00; C01P2006/60; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
A method of stripping an organic extraction solvent containing (a) a metal quaternary alkyl ammonium complex selected from the group consisting of molybdenum, vanadium and tungsten quaternary alkyl ammonium complex or mixture of molybdenum, vanadium and tungsten quaternary alkyl ammonium complexes (b) a mixture of molybdenum and tungsten quaternary alkyl ammonium complexes, (c) a mixture of vanadium and tungsten quaternary alkyl ammonium complexes comprising: contacting said organic extraction solvent with an aqueous stripping solution maintained at a temperature of no more than 50° C., a pH between 7 and 9, and containing at least 75 grams per liter of a salt of a bicarbonate ion, for a time sufficient to convert said metal quaternary alkyl ammonium complex or mixtures thereof to an aqueous soluble metal complex; and separating said organic extraction solvent and said aqueous stripping solution.
Claim 2
Independent Claim
137 words
A method of stripping an organic extraction solvent containing (a) a metal quaternary alkyl ammonium complex selected from the group consisting of molybdenum, vanadium and tungsten quaternary alkyl ammonium complex or mixture of molybdenum, vanadium and tungsten quaternary alkyl ammonium complexes (b) a mixture of molybdenum and tungsten quaternary alkyl ammonium complexes, (c) a mixture of vanadium and tungsten quaternary alkyl ammonium complexes comprising: contacting said organic extraction solvent with an aqueous stripping solution maintained at a temperature of no more than 50° C., a pH between 7 and 9, and containing at least 75 grams per liter of a salt of a bicarbonate ion, for a time sufficient to convert said metal quaternary alkyl ammonium complex or mixtures thereof to an aqueous soluble metal complex; and separating said organic extraction solvent and said aqueous stripping solution.
Claim 3
Dependent Claim
39 words
The process of claim 1 wherein said metal quaternary alkyl ammonium complex is selected from the group consisting of a molybdenum, vanadium and tungsten quaternary alkyl ammonium complex or mixture of molybdenum, vanadium and tungsten quaternary alkyl ammonium complexes.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said metal quaternary alkyl ammonium complex is a molybdenum quaternary alkyl ammonium complex.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein said metal quaternary alkyl ammonium complex is a vanadium quaternary alkyl ammonium complex.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein said metal quaternary alkyl ammonium complex is a tungsten quaternary alkyl ammonium complex.
Claim 7
Dependent Claim
23 words
The process of claim 1 wherein said metal quaternary alkyl ammonium complex is a mixture of molybdenum and tungsten quaternary alkyl ammonium complexes.
Claim 8
Dependent Claim
23 words
The process of claim 1 wherein said metal quaternary alkyl ammonium complex is a mixture of vanadium and tungsten quaternary alkyl ammonium complexes.
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein said salt of bicarbonate ion is ammonium bicarbonate.
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein said organic extract solution contains tri-caprylyl methyl ammonium chloride.
Claim 11
Dependent Claim
16 words
The process of claim 1 wherein said bicarbonate concentration is at least 160 grams per liter.
References Cited (Backward Citations)
US3083085A
Cited
US3320024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |