US4111833A
Expired / Lapsed
US
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Activated carbon material
Assignee: United States Department of Energy
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Filing: 1974-09-05
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Granted: 1978-09-05
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Expires: 1994-09-05
Abstract
Abstract Activated carbon particles for use as iodine trapping material are impregnated with a mixture of selected iodine and potassium compounds to improve the iodine retention properties of the carbon. The I/K ratio is maintained at less than about 1 and the pH is maintained at above about 8.0. The iodine retention of activated carbon previously treated with or coimpregnated with triethylenediamine can also be improved by this technique. Suitable flame retardants can be added to raise the ignition temperature of the carbon to acceptable standards.
Inventors
- 👤 A. Gary Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:59
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/68; C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/342; C01B32/348
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
58 words
A carbon material having improved iodine retention properties consisting essentially of activated carbon materials impregnated with iodine, KI or mixtures thereof with basic potassium compounds wherein the ratio of I to K in said impregnated carbon material is less than about 1.0 and the pH of an aqueous extract of said carbon material is greater than about 8.0.
Claim 2
Dependent Claim
58 words
A carbon material having improved iodine retention properties consisting essentially of activated carbon materials impregnated with iodine, KI or mixtures thereof with basic potassium compounds wherein the ratio of I to K in said impregnated carbon material is less than about 1.0 and the pH of an aqueous extract of said carbon material is greater than about 8.0.
Claim 3
Dependent Claim
40 words
The carbon material of claim 1 wherein the ratio of I to K in said impregnated carbon material is between about 0.2 and 0.9 and the pH of an aqueous extract of said carbon is between about 8.5 and 10.5.
Claim 4
Dependent Claim
25 words
The carbon material of claim 1 wherein the basic potassium compounds are selected from the group consisting of KOH and K 2 CO 3 .
Claim 5
Dependent Claim
30 words
The carbon material of claim 1 wherein said activated carbon material is impregnated with a mixture of compounds selected from the group KOH-I 2 , KOH-KI, and KOH-KI-I 2 .
Claim 6
Dependent Claim
39 words
The carbon material of claim 4 wherein the ratio of I to K in said impregnated carbon is between about 0.2 and 0.9 and the pH of an aqueous extract of said carbon is between about 8.5 and 10.5.
Claim 7
Dependent Claim
25 words
The carbon material of claim 1 wherein said activated carbon material also contains the compound triethylenediamine in amounts between about 0.5% and 5% by weight.
Claim 8
Dependent Claim
28 words
The carbon material of claim 1 wherein said activated carbon also contains a flame retardant selected from the group consisting of sodium dihydrogen phosphate and potassium dihydrogen phosphate.
Claim 9
Independent Claim
67 words
The method of improving the iodine retention of activated carbon material which comprises treating said carbon with iodine, KI or mixtures thereof with basic potassium compounds, said iodine, said KI, and said compounds being selected so as to maintain a ratio of I to K of less than about 1.0 and maintain the pH of an aqueous extract of said treated carbon at greater than about 8.0.
Claim 10
Independent Claim
67 words
The method of improving the iodine retention of activated carbon material which comprises treating said carbon with iodine, KI or mixtures thereof with basic potassium compounds, said iodine, said KI, and said compounds being selected so as to maintain a ratio of I to K of less than about 1.0 and maintain the pH of an aqueous extract of said treated carbon at greater than about 8.0.
Claim 11
Dependent Claim
31 words
The method of claim 8 wherein said ratio of I to K is between about 0.2 and 0.9 and the pH of said aqueous extract is between about 8.5 and 10.5.
Claim 12
Dependent Claim
24 words
The method of claim 8 wherein the basic potassium compounds are selected from the group consisting of KOH and K 2 CO 3 .
Claim 13
Dependent Claim
29 words
The method of claim 8 wherein said activated carbon material is treated with a mixture of compounds selected from the group KOH-I 2 , KOH-KI, and KOH-KI-I 2 .
Claim 14
Dependent Claim
28 words
The method of claim 8 wherein said activated carbon is treated with triethylenediamine and with compounds selected from the group KOH-I 2 , KOH-KI, and KOH-KI-I 2 .
Claim 15
Dependent Claim
21 words
The method of claim 12 wherein said activated carbon is treated with triethylenediamine in amounts between 0.5% and 5% by weight.
Claim 16
Dependent Claim
29 words
The method of claim 8 wherein said activated carbon is also treated with a flame retardant selected from the group consisting of sodium dihydrogen phosphate and potassium dihydrogen phosphate.
Claim 17
Independent Claim
94 words
A method of improving the iodine retention of activated carbon material which comprises (a) sizing activated carbon granules; (b) saturating said sized carbon granules with an aqueous solution of compounds selected from the group KOH-I 2 , KOH-KI, and KOH-KI-I 2 ; (c) adjusting said solution so that the ratio of I to K in said carbon material is less than about 1.0 and the pH of an aqueous extract thereof is greater than about 8.0; and (d) drying said saturated carbon granules to form an impregnated activated carbon material having improved iodine retention.
Claim 18
Independent Claim
94 words
A method of improving the iodine retention of activated carbon material which comprises (a) sizing activated carbon granules; (b) saturating said sized carbon granules with an aqueous solution of compounds selected from the group KOH-I 2 , KOH-KI, and KOH-KI-I 2 ; (c) adjusting said solution so that the ratio of I to K in said carbon material is less than about 1.0 and the pH of an aqueous extract thereof is greater than about 8.0; and (d) drying said saturated carbon granules to form an impregnated activated carbon material having improved iodine retention.
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) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |