US3859415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen cyanide removal
Assignee: North Western Gas Board
•
Filing: 1972-09-15
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Granted: 1975-01-07
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Expires: 1992-09-15
Abstract
Abstract Hydrogen cyanide is removed from gas mixtures containing hydrogen cyanide and hydrogen sulphide by treating the gas mixture with a catalyst comprising the elements nickel, uranium and thorium disposed as their oxides on a gamma alumina support. Preferably the gas mixture is saturated with water vapour before being subjected to the catalytic treatment.
Inventors
- 👤 Thomas Nicklin
- 👤 Peter Spence Clough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:47
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/83; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
A METHOD FOR REMOVING HYDROGEN CYANIDE FROM A GAS MIXTURE CONTAINING HYDROGEN, HYDROGEN CYANIDE AND HYDROGEN SULPHIDE WHICH PROCESS COMPRISES CONTACTING SAID MIXTURE WITH A TRICOMPONENT CATALYST SYSTEM CONATINING 8.4% NICKEL, 10.7% URANIUM AND 9.1% THORIUM DISPOSED AS THEIR OXIDES ON A GAMMA ALUMINA SUPPORT, AT A TEMPERATURE OF FROM 150* TO 250*C.
Claim 2
Independent Claim
53 words
A METHOD FOR REMOVING HYDROGEN CYANIDE FROM A GAS MIXTURE CONTAINING HYDROGEN, HYDROGEN CYANIDE AND HYDROGEN SULPHIDE WHICH PROCESS COMPRISES CONTACTING SAID MIXTURE WITH A TRICOMPONENT CATALYST SYSTEM CONATINING 8.4% NICKEL, 10.7% URANIUM AND 9.1% THORIUM DISPOSED AS THEIR OXIDES ON A GAMMA ALUMINA SUPPORT, AT A TEMPERATURE OF FROM 150* TO 250*C.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1, in which the gas mixture is saturated with water vapour before being subjected to the catalytic treatment.
Claim 4
Dependent Claim
40 words
A method as claimed in claim 1, in which the catalyst is obtained by impregnating gamma alumina granules with a solution of the nitrates of nickel, uranium and thorium and calcining to cause decomposition of the nitrates to the oxides.
References Cited (Backward Citations)
US2743153A
Cited
US3717699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |