US3995017A
Expired / Lapsed
US
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Catalyst for hydrogen-amine D exchange
Assignee: Atomic Energy of Canada Ltd AECL
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Filing: 1974-06-26
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Granted: 1976-11-30
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Expires: 1994-06-26
Abstract
Abstract A process for deuterium isotopic enrichment (suitable for use in heavy water production) by amine-hydrogen exchange in which the exchange catalyst comprises a mixture of alkyl amides of two metals selected from the group consisting of the alkali metals. Catalyst mixtures comprising at least one of the alkali amides of lithium and potassium are preferred. At least one of the following benefits are obtained:decreased hydride formation, decreased thermal decomposition of alkyl amide, increased catalyst solubility in the amine phase, and increased exchange efficiency.
Inventors
- 👤 William John Holtslander
- 👤 Ronald Elvidge Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:53
CPC Classifications
C; C01; C01B; C01B4/00; B; B01; B01D; B01D59/00; B01D59/28
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
A process of enriching deuterium employing the hydrogen-methylamine exchange reaction catalyzed by alkali metal methylamide in the amine phase, at elevated hydrogen pressures, comprising providing a composite catalyst consisting essentially of a mixture of methylamides of two alkali metals dissolved in methylamine, the two alkali metals being chosen from the pairs: lithium plus sodium; lithium plus potassium; and sodium plus cesium, the methylamides of the composite catalyst being in molar proportions which show insignificant hydride precipitation in the amine at hydrogen pressures sufficient to precipitate sodium alone, or potassium alone as hydrides.
Claim 2
Dependent Claim
92 words
A process of enriching deuterium employing the hydrogen-methylamine exchange reaction catalyzed by alkali metal methylamide in the amine phase, at elevated hydrogen pressures, comprising providing a composite catalyst consisting essentially of a mixture of methylamides of two alkali metals dissolved in methylamine, the two alkali metals being chosen from the pairs: lithium plus sodium; lithium plus potassium; and sodium plus cesium, the methylamides of the composite catalyst being in molar proportions which show insignificant hydride precipitation in the amine at hydrogen pressures sufficient to precipitate sodium alone, or potassium alone as hydrides.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the catalyst is a mixture of lithium plus one of sodium and potassium methylamides.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the catalyst is a mixture of lithium and potassium methylamides.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein the catalyst is a mixture of lithium- and potassium methyl amides, the molar ratio of Li- to K methyl amide being at least about 1:1.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the mixture is selected from methyl amides of Li + Na; and Na + Cs.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein the deuterium exchange is carried out under a hydrogen pressure of up to about 3500 psi.
Claim 8
Dependent Claim
25 words
The process of claim 1 wherein the temperature of the exchange process ranges from above the m.p. of the amine up to about 100° C.
Claim 9
Dependent Claim
77 words
A composite catalyst for the exchange of deuterium between hydrogen and methylamine said catalyst consisting essentially of a mixture of methylamides of two alkali metals dissolved in methylamine; said alkali metals being selected from the pairs: Li plus Na; Li plus K; and Na plus Cs; the methylamides of the composite catalyst being in molar proportions which show insignificant hydride precipitation in the methylamine at hydrogen pressures sufficient to precipitate sodium alone, or potassium alone as hydrides.
Claim 10
Dependent Claim
77 words
A composite catalyst for the exchange of deuterium between hydrogen and methylamine said catalyst consisting essentially of a mixture of methylamides of two alkali metals dissolved in methylamine; said alkali metals being selected from the pairs: Li plus Na; Li plus K; and Na plus Cs; the methylamides of the composite catalyst being in molar proportions which show insignificant hydride precipitation in the methylamine at hydrogen pressures sufficient to precipitate sodium alone, or potassium alone as hydrides.
Claim 11
Dependent Claim
17 words
The catalyst of claim 8 wherein the mixture is lithium plus one of sodium and potassium methylamides.
Claim 12
Dependent Claim
13 words
The catalyst of claim 8 wherein the mixture is lithium plus potassium methylamides.
Claim 13
Dependent Claim
19 words
The catalyst of claim 10 wherein the molar ratio of lithium to potassium methylamides is at least about 1:1.
References Cited (Backward Citations)
US2685604A
Cited
US3133793A
Cited
US3457041A
Cited
CA901266A
Cited
US3716623A
Cited
US3716621A
Cited
GB1341475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-30 | 1980-05-31 | 1980-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-30 | 1984-05-31 | 1984-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-30 | 1988-05-31 | 1988-11-30 | $7700.00 | Window Closed / Lapsed |