US3864327A
Expired / Lapsed
US
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Removal of Mercury From Solutions
Assignee: United States Department of the Interior
•
Filing: 1973-09-19
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Granted: 1975-02-04
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Expires: 1993-09-19
Abstract
Abstract Mercury is removed from aqueous solution by contacting the solution with an absorbent prepared by incorporating vicinal thiol groups into a cellulose matrix.
Inventors
- 👤 Wayne N Marchant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:40
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; C; C02; C02F; C02F1/00; C02F1/28; C02F1/286; C02F1/52; C02F1/5272; C08; C08B; C08B11/00; C08B11/02; C08B11/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
AN ADSORBENT FOR REMOVAL OF MERCURY FROM AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF A CELLULOSE MATRIX HAVING GRAFTED THERETO A PLURALITY OF VICINAL DITHIOL-SUBSTITUTED HYDROCARBON RADICALS.
Claim 2
Dependent Claim
25 words
AN ADSORBENT FOR REMOVAL OF MERCURY FROM AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF A CELLULOSE MATRIX HAVING GRAFTED THERETO A PLURALITY OF VICINAL DITHIOL-SUBSTITUTED HYDROCARBON RADICALS.
Claim 3
Dependent Claim
17 words
The adsorbent of claim 1 in which the vicinal dithiol-substituted hydrocarbon radicals consist of 2,3-dithiol propyl radicals.
Claim 4
Dependent Claim
98 words
A process for preparation of the adsorbent of claim 1 comprising the steps of (1) preparation of alkaline cellulose by reaction of cellulose with strong alkali, (2) reaction of the alkaline cellulose with a reactant consisting of a compound containing a hydrocarbon radical having at least one double bond and a reactive substituent from the group consisting of bromine, chlorine, iodine, and epoxide to incorporate the hydrocarbon radical into the cellulose, (3) bromination of the hydrocarbon radicals, and (4) reaction of the product of step (3) with a hydrosulfide to form vicinal dithiol groups on the hydrocarbon groups.
Claim 5
Dependent Claim
15 words
The process of claim 3 in which the reactant of step (2) is allyl bromide.
Claim 6
Dependent Claim
16 words
The process of claim 3 in which the reactant of step (2) is allyl glycidyl ether.
References Cited (Backward Citations)
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US2232927A
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US2418939A
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US3484390A
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US3719473A
Cited
US3725261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |