US4075282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for impregnating active carbon with iodine compounds
Assignee: Laboratorium fuer Adsorptionstechnik GmbH
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Filing: 1976-01-22
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Granted: 1978-02-21
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Expires: 1996-01-22
Abstract
Abstract A process for the impregnation of active carbon with an iodine compound in which the solution is also provided with a reducing agent preferably hydrazine or a compound capable of decomposing to produce sulfur dioxide (e.g. a sulfite or hydrogen sulfite) or solubilized sulfur dioxide. The impregnated active carbon can be used for the removal of sulfur dioxide or hydrogen sulfide from a gas stream.
Inventors
- 👤 Klaus Storp
- 👤 Hans Wirth
- 👤 Gunter Rittinger
- 👤 Volker Hohmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:17
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/34; B01D53/46; B01D53/48; B01D53/52; B01D53/74; B01D53/86; B01D53/8603; B01D53/8609; B01J; B01J20/00; B01J20/02; B01J20/04; B01J20/046; B01J20/20; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28054; B01J20/28057; B01J20/28064; B01J20/30; B01J20/3085; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3234; B01J20/3236; B01J20/3289; B01J2220/00; B01J2220/50; B01J2220/56; B01J2220/60; B01J2220/606; B01J2220/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
A process for the removal of sulfur dioxide or hydrogen sulfide from a gas stream which comprises the steps of: a. impregnating in a static state an active-carbon bed with an aqueous solution containing iodine or a water-soluble iodide salt and a reducing agent soluble in said solution and selected from the group which consists of sulfur dioxide, alkali metal sulfites, alkali metal hydrogen sulfites and hydrazine, the quantity of said reducing agent being at least the equivalent of the reducing capabilities of 3 grams of SO 2 per liter; and b. thereafter passing said gas through the impregnated bed.
Claim 2
Dependent Claim
100 words
A process for the removal of sulfur dioxide or hydrogen sulfide from a gas stream which comprises the steps of: a. impregnating in a static state an active-carbon bed with an aqueous solution containing iodine or a water-soluble iodide salt and a reducing agent soluble in said solution and selected from the group which consists of sulfur dioxide, alkali metal sulfites, alkali metal hydrogen sulfites and hydrazine, the quantity of said reducing agent being at least the equivalent of the reducing capabilities of 3 grams of SO 2 per liter; and b. thereafter passing said gas through the impregnated bed.
Claim 3
Dependent Claim
37 words
The process defined in claim 1 wherein said reducing agent is present in said solution in a quantity at least sufficient to stoichiometrically react with oxidizing substances contained within and adsorbed on the carbon of said bed.
Claim 4
Dependent Claim
24 words
The process defined in claim 1 wherein said reducing agent is selected from the group which consists of compounds producing sulfur dioxide upon decomposition.
Claim 5
Dependent Claim
15 words
The process defined in claim 1 wherein said reducing agent is sodium sulfite or bisulfite.
References Cited (Backward Citations)
US2121793A
Cited
DE1227434B
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DE1224865B
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GB1087272A
Cited
GB1090306A
Cited
US3961020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |