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Patent US4372934A successfully refreshed from Google Patents.
US4372934A
Expired / Lapsed
US
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Production of isocyanic acid
Assignee: Ashland LLC
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Filing: 1982-06-07
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Granted: 1983-02-08
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Expires: 2002-06-07
Abstract
Abstract Isocyanic acid is formed directly from nitric oxide, carbon monoxide and hydrogen by contacting a supported bifunctional iridium or rhodium metal catalyst at an elevated temperature with a feed stream of said reactants.
Inventors
- 👤 Jai H. Kyung
- 👤 Phyllis L. Brusky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:37
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A process for preparing isocyanic acid which comprises reacting a mixture of nitric oxide, carbon monoxide and hydrogen at a temperature of from about 200° to 400° C. in the presence of a doped iridium or rhodium metal catalyst supported on a particulate carrier selected from the group consisting of silica, γ-alumina, zirconium oxide and silica carbide, said carrier further characterized in having a surface area, expressed as m 2 /g, of not in excess of one, and wherein said dopant is selected from the group consisting of Ni, Zn, Cu, Co, Cr, Fe, Cd and Ag metal with the dopant metal present to the extent of 0.1-2 mol % based on said metal catalyst.
Claim 2
Dependent Claim
115 words
A process for preparing isocyanic acid which comprises reacting a mixture of nitric oxide, carbon monoxide and hydrogen at a temperature of from about 200° to 400° C. in the presence of a doped iridium or rhodium metal catalyst supported on a particulate carrier selected from the group consisting of silica, γ-alumina, zirconium oxide and silica carbide, said carrier further characterized in having a surface area, expressed as m 2 /g, of not in excess of one, and wherein said dopant is selected from the group consisting of Ni, Zn, Cu, Co, Cr, Fe, Cd and Ag metal with the dopant metal present to the extent of 0.1-2 mol % based on said metal catalyst.
Claim 3
Dependent Claim
12 words
The process according to claim 1 wherein the metal catalyst is iridium.
Claim 4
Dependent Claim
12 words
The process according to claim 2 wherein said particulate carrier is γ-alumina.
Claim 5
Dependent Claim
12 words
The process according to claim 2 wherein said particulate carrier is silica.
Claim 6
Dependent Claim
14 words
The process according to claim 3 or 4 wherein the dopant metal is nickel.
Claim 7
Dependent Claim
14 words
The process according to claim 3 or 4 wherein the dopant metal is zinc.
Claim 8
Dependent Claim
14 words
The process according to claim 3 or 4 wherein the dopant metal is copper.
Claim 9
Dependent Claim
14 words
The process according to claim 3 or 4 wherein the dopant metal is cobalt.
References Cited (Backward Citations)
US4174377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |