Patent US4271133A successfully refreshed from Google Patents.
US4271133A
Expired / Lapsed
US
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Process for removing hydrogen cyanide from gaseous streams
Assignee: Union Carbide Corp
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Filing: 1980-03-31
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Granted: 1981-06-02
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Expires: 2000-03-31
Abstract
Abstract This invention relates to a process for reducing the hydrogen cyanide content of a gaseous stream which comprises providing an adsorbent bed wherein the adsorbent comprises zinc oxide and contains no more than 5%, by weight, of an oxide of an alkali or alkaline earth metal, and contacting said process stream with said adsorbent bed at a temperature of from about ambient to about 350 DEG C. for a period of time sufficient to reduce the concentration of hydrogen cyanide in said gaseous stream to the desired value.
Inventors
- 👤 Cyril Tellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:54
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/20; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/54
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A process for reducing the hydrogen cyanide content of a gaseous stream which comprises: (a) providing an adsorbent bed wherein the adsorbent comprises zinc oxide and contains no more than 5%, by weight, of an oxide of an alkali or alkaline earth metal, and (b) contacting said process stream with said adsorbent bed at a temperature of from about ambient to about 350° C. for a period of time sufficient to reduce the concentration of hydrogen cyanide in said gaseous stream to the desired value.
Claim 2
Dependent Claim
85 words
A process for reducing the hydrogen cyanide content of a gaseous stream which comprises: (a) providing an adsorbent bed wherein the adsorbent comprises zinc oxide and contains no more than 5%, by weight, of an oxide of an alkali or alkaline earth metal, and (b) contacting said process stream with said adsorbent bed at a temperature of from about ambient to about 350° C. for a period of time sufficient to reduce the concentration of hydrogen cyanide in said gaseous stream to the desired value.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the temperature of said adsorbent is from about 150° C. to about 300° C.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein said process stream additionally contains hydrogen sulfide as an impurity.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein said process stream additionally contains hydrogen chloride as an impurity.
Claim 6
Dependent Claim
33 words
The process of claim 1 wherein the concentration of hydrogen cyanide in the process stream prior to contacting said adsorbent bed is from about 1 to about 100 parts per million (by volume).
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein the concentration of hydrogen cyanide in the process stream is reduced to below 0.1 parts per million (by volume).
Claim 8
Dependent Claim
91 words
A process for purifying a gaseous stream containing hydrogen cyanide, carbonyl sulfide, hydrogen sulfide and hydrogen chloride as impurities therein which comprises: (a) providing an adsorbent bed wherein the adsorbent comprises zinc oxide and contains no more than 5%, by weight, of an oxide of an alkali or alkaline earth metal, and (b) contacting said process stream with said adsorbent bed at a temperature of from about ambient to about 350° C. for a period of time sufficient to reduce the concentrations of each of said impurities to the desired value.
Claim 9
Dependent Claim
91 words
A process for purifying a gaseous stream containing hydrogen cyanide, carbonyl sulfide, hydrogen sulfide and hydrogen chloride as impurities therein which comprises: (a) providing an adsorbent bed wherein the adsorbent comprises zinc oxide and contains no more than 5%, by weight, of an oxide of an alkali or alkaline earth metal, and (b) contacting said process stream with said adsorbent bed at a temperature of from about ambient to about 350° C. for a period of time sufficient to reduce the concentrations of each of said impurities to the desired value.
Claim 10
Dependent Claim
35 words
The process of claim 7 wherein the concentration of carbonyl sulfide, hydrogen sulfide, hydrogen chloride and hydrogen cyanide in the gaseous stream prior to contacting said adsorbent bed is from about 1 to 100 ppmv.
Claim 11
Dependent Claim
23 words
The process of claim 7 wherein the concentration of each of said impurities in the gaseous stream is reduced to below 0.1 ppmv.
Claim 12
Dependent Claim
19 words
The process of claim 7 wherein the temperature of said adsorbent is from about 150° to about 300° C.
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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) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |