US4547345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of molybdenum from spent catalyst solutions obtained from hydroperoxide epoxidations
Assignee: Cyprus Amax Minerals Co
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Filing: 1984-03-14
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Granted: 1985-10-15
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Expires: 2004-03-14
Abstract
Abstract Molybdenum is recovered from an organic material, such as a spent epoxidation catalyst, by heating the material in a stream of non-oxidizing gas at a temperature of at least about 400° C. to evolve the organic in the gas stream from which it is recovered and to leave a powdery residue containing essentially all of the molybdenum.
Inventors
- 👤 Roger F. Sebenik
- 👤 Jerry D. Baker
- 👤 John M. Laferty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:46
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/34; C22B7/00; C22B7/009; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
The process for recovering molybdenum dissolved in a spent molybdenum containing tarry epoxidation catalyst mass of high organic content resulting from epoxidation of an olefin, said catalyst being made by dissolving molybdenum in an organic acid containing a small amount of a hydroperoxide and said spent catalyst mass including organic process reactants, products, and byproducts, which comprises heating said catalyst mass having a dissolved molybdenum content of about 0.5% to about 40% in a flowing atmosphere of a gas non-reactive to molybdenum into the temperature range of at least about 400° C. up to about 1100° C. to evolve organic material from said catalyst mass and carry off said organic material in said gas stream, recovering said organic material from the off-gas stream with unaffected fuel value and producing a solid residue containing said molybdenum.
Claim 2
Dependent Claim
135 words
The process for recovering molybdenum dissolved in a spent molybdenum containing tarry epoxidation catalyst mass of high organic content resulting from epoxidation of an olefin, said catalyst being made by dissolving molybdenum in an organic acid containing a small amount of a hydroperoxide and said spent catalyst mass including organic process reactants, products, and byproducts, which comprises heating said catalyst mass having a dissolved molybdenum content of about 0.5% to about 40% in a flowing atmosphere of a gas non-reactive to molybdenum into the temperature range of at least about 400° C. up to about 1100° C. to evolve organic material from said catalyst mass and carry off said organic material in said gas stream, recovering said organic material from the off-gas stream with unaffected fuel value and producing a solid residue containing said molybdenum.
Claim 3
Dependent Claim
32 words
The process in accordance with claim 1 wherein said heating is accomplished in a fluid bed reactor through which a stream of nitrogen is passed to provide said atmosphere non-reactive to molybdenum.
Claim 4
Dependent Claim
20 words
The processs in accordance with claim 2 wherein said organic material is recovered by condensation from said nitrogen off-gas stream.
Claim 5
Dependent Claim
39 words
The process in accordance with claim 1 wherein said heating is accomplished at a temperature of at least about 900° C. in a fluid bed reactor through which a stream of hydrogen is passed to provide the non-reactive atmosphere.
Claim 6
Dependent Claim
20 words
The process in accordance with claim 4 wherein said organic material is recovered by condensation from said hydrogen off-gas stream.
Claim 7
Dependent Claim
16 words
The process in accordance with claim 4 wherein said heating is conducted at about 1100° C.
References Cited (Backward Citations)
GB484962A
Cited
US2985580A
Cited
US3211668A
Cited
GB1158418A
Cited
JPS5567335A
Cited
DD151764A1
Cited
US4425255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |