Patent US4411798A successfully refreshed from Google Patents.
US4411798A
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US
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Process for separating D2 O from H2 O using surfactant systems
Assignee: Standard Oil Co
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Filing: 1981-10-09
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Granted: 1983-10-25
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Expires: 2001-10-09
Abstract
Abstract This invention relates to a process for separating heavy water from solutions. An anionic surfactant system is added to a solution of deuterium oxide in water. The separating agent added to the solution will form a first phase containing a majority of the surfactant with an increased concentration of D 2 O and a second phase containing excess water with a decreased concentration of D 2 O. The first stage is separated from the second stage, and the process is optionally repeated in a multi-stage or a continuous operation.
Inventors
- 👤 Keng S. Chan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:27
CPC Classifications
C; C01; C01B; C01B4/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 words
A process for separating D 2 O from solutions of D 2 O in H 2 O, the process comprising: (i) adding an anionic surfactant system to a solution of D 2 O in H 2 O in an amount capable of forming micelles of the surfactant; (ii) providing a separating agent in the solution in an amount sufficient to form a flocculated micellar first phase containing a majority of the surfactant system with an increased concentration of D 2 O and a second phase containing excess water with a decreased concentration of D 2 O; (iii) separating the first phase from the second phase; (iv) introducing an additional solution of D 2 O in H 2 O to the first phase; and (v) repeating steps (i)-(iii) to separate said D 2 O from said additional solution.
Claim 2
Dependent Claim
137 words
A process for separating D 2 O from solutions of D 2 O in H 2 O, the process comprising: (i) adding an anionic surfactant system to a solution of D 2 O in H 2 O in an amount capable of forming micelles of the surfactant; (ii) providing a separating agent in the solution in an amount sufficient to form a flocculated micellar first phase containing a majority of the surfactant system with an increased concentration of D 2 O and a second phase containing excess water with a decreased concentration of D 2 O; (iii) separating the first phase from the second phase; (iv) introducing an additional solution of D 2 O in H 2 O to the first phase; and (v) repeating steps (i)-(iii) to separate said D 2 O from said additional solution.
Claim 3
Dependent Claim
28 words
The process of claim 1 in which the separating agent comprises at least one of an inorganic salt and a paraffinic oil of from 6 to 16 carbons.
Claim 4
Dependent Claim
23 words
The process of claim 2 in which the separating agent comprises a combination of at least one salt and at least one oil.
Claim 5
Dependent Claim
17 words
The process of claim 3 in which the salt is sodium chloride and the oil is n-octane.
Claim 6
Dependent Claim
30 words
The process of claim 4 in which the solution of D 2 O in H 2 O is a 10% by volume mixture of D 2 O in distilled water.
Claim 7
Dependent Claim
20 words
The process of claim 4 in which the solution of D 2 O in H 2 O is natural water.
Claim 8
Dependent Claim
20 words
The process of claim 4 in which the solution of D 2 O in H 2 O is sea water.
Claim 9
Dependent Claim
18 words
The process of claim 5 in which the anionic surfactant system comprises a petroleum sulfonate and isobutyl alcohol.
Claim 10
Dependent Claim
18 words
The process of claim 5 or 6 in which the anionic surfactant system comprises sodium-di-2-ethylhexyl-sulfosuccinate and n-butyl alcohol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |