US4801311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for removing hydrogen cyanide, cyanogen and cyanogen chloride from air
Assignee: WestRock MWV LLC
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Filing: 1985-03-18
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Granted: 1989-01-31
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Expires: 2005-03-18
Abstract
Abstract A chromium free absorbent filter material and method for removing toxic gases such as cyanogen chloride, cyanogen and hydrogen cyanide is disclosed. The filter material is a whetlerite type activated carbon impregnated with copper, silver, and molybdenum and/or vanadium salts together with triethylenediamine and essentially retains the effectiveness of similar chromium containing whetlerites for protection without the carcinogenic hazard presented by chromium. The new material also releases substantially less ammonia odor compared to the conventional chromium bearing whetlerite.
Inventors
- 👤 Edward D. Tolles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:28
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54; A; A62; A62B; A62B23/00; B01D53/02; B01J; B01J20/00; B01J20/02; B01J20/20
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
74 words
An improved method for removing toxic gases selected from the group consisting of the mixture of hydrogen cyanide and cyanogen chloride, the mixture of cyanogen and cyanogen chloride, the mixture of hydrogen cyanide, cyanogen and cyanogen chloride, and cyanogen chloride from an air stream containing said toxic gases using type ASM whetlerite carbons, wherein the improvement comprises utilizing said carbon having an amount of triethylenediamine added thereto effective for the removal of cyanogen chloride.
Claim 2
Dependent Claim
74 words
An improved method for removing toxic gases selected from the group consisting of the mixture of hydrogen cyanide and cyanogen chloride, the mixture of cyanogen and cyanogen chloride, the mixture of hydrogen cyanide, cyanogen and cyanogen chloride, and cyanogen chloride from an air stream containing said toxic gases using type ASM whetlerite carbons, wherein the improvement comprises utilizing said carbon having an amount of triethylenediamine added thereto effective for the removal of cyanogen chloride.
Claim 3
Dependent Claim
23 words
The improved method of claim 1 wherein said triethylenediamine is present in an amount ranging from about 1.0 to about 7.5 weight %.
Claim 4
Dependent Claim
23 words
The improved method of claim 1 wherein said triethylenediamine is present in an amount ranging from about 4 to about 6 weight %.
Claim 5
Dependent Claim
74 words
An improved method for removing toxic gases selected from the group consisting of the mixture of hydrogen cyanide and cyanogen chloride, the mixture of cyanogen and cyanogen chloride, the mixture of hydrogen cyanide, cyanogen and cyanogen chloride, and cyanogen chloride from an air stream containing said toxic gases using type ASV whetlerite carbons, wherein the improvement comprises utilizing said carbon having an amount of triethylenediamine added thereto effective for the removal of cyanogen chloride.
Claim 6
Dependent Claim
74 words
An improved method for removing toxic gases selected from the group consisting of the mixture of hydrogen cyanide and cyanogen chloride, the mixture of cyanogen and cyanogen chloride, the mixture of hydrogen cyanide, cyanogen and cyanogen chloride, and cyanogen chloride from an air stream containing said toxic gases using type ASV whetlerite carbons, wherein the improvement comprises utilizing said carbon having an amount of triethylenediamine added thereto effective for the removal of cyanogen chloride.
Claim 7
Dependent Claim
23 words
The improved method of claim 4 wherein said triethylenediamine is present in an amount ranging from about 1.0 to about 7.5 weight %.
Claim 8
Dependent Claim
23 words
The improved method of claim 4 wherein said triethylenediamine is present in an amount ranging from about 4 to about 6 weight %.
Claim 9
Dependent Claim
31 words
Filter for removing toxic gases from an air stream comprising chromium-free carbon particles impregnated with copper, triethylenediamine and one or more components selected from the group consisting of molybdenum and vanadium.
Claim 10
Dependent Claim
31 words
Filter for removing toxic gases from an air stream comprising chromium-free carbon particles impregnated with copper, triethylenediamine and one or more components selected from the group consisting of molybdenum and vanadium.
Claim 11
Dependent Claim
14 words
The filter of claim 7 wherein the carbon particles are additionally impregnated with silver.
Claim 12
Dependent Claim
15 words
The filter of claim 8 wherein the silver content is up to 0.5 weight percent.
Claim 13
Dependent Claim
21 words
The filter of claim 7 wherein the toxic gases removed are one or more of cyanogen chloride, cyanogen and hydrogen cyanide.
Claim 14
Dependent Claim
21 words
The filter of claim 10 wherein the molybdenum and/or vanadium content ranges from about 1 to about 10 weight percent, individually.
Claim 15
Dependent Claim
18 words
The filter of claim 7 wherein the copper content is from about 5 to about 20 weight percent.
Claim 16
Dependent Claim
18 words
The filter of claim 7 wherein the triethylenediamine content is from about 1.0 to about 7.5 weight percent.
Claim 17
Dependent Claim
46 words
The filter of claim 7 or 8 having the following composition: copper: from about 5 to about 20 weight % silver: up to 0.5 weight % molybdenum: from about 1 to about 10 weight % triethylenediamine: from about 1.0 to about 7.5 weight % carbon: balance.
Claim 18
Dependent Claim
35 words
The filter of claim 14 having the following composition: copper: 5 to 20 weight % silver: up to 0.5 weight % molybdenum: 1 to 10 weight % triethylenediamine: 4 to 6 weight % carbon: balance.
Claim 19
Dependent Claim
47 words
The filter of claim 7 or 8 having the following composition: copper: from about 5 to about 20 weight % silver: up to about 0.5 weight % vanadium: from about 1 to about 10 weight % triethylenediamine: from about 1.5 to about 7.5 weight %. carbon: balance.
Claim 20
Dependent Claim
35 words
The filter of claim 16 having the following composition: copper: 5 to 20 weight % silver: up to 0.5 weight % vanadium: 1 to 10 weight % triethylenediamine: 4 to 6 weight % carbon: balance.
Claim 21
Dependent Claim
15 words
Type ASV whetlerite charcoal further including triethylenediamine in an amount effective for removing cyanogen chloride.
Claim 22
Dependent Claim
15 words
Type ASV whetlerite charcoal further including triethylenediamine in an amount effective for removing cyanogen chloride.
Claim 23
Dependent Claim
15 words
Type ASM whetlerite charcoal further including triethylenediamine in an amount effective for removing cyanogen chloride.
Claim 24
Dependent Claim
15 words
Type ASM whetlerite charcoal further including triethylenediamine in an amount effective for removing cyanogen chloride.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |