US4372933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of isocyanic acid
Assignee: Ashland LLC
•
Filing: 1982-04-29
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Granted: 1983-02-08
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Expires: 2002-04-29
Abstract
Abstract Isocyanic acid is formed directly from nitric oxide, carbon monoxide and hydrogen by contacting a supported iridium or rhodium metal catalyst at an elevated temperature with a feed stream of said reactants.
Inventors
- 👤 Jai H. Kyung
- 👤 Joseph G. Holehouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:58
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 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 iridium or rhodium metal catalyst supported on a particulate carrier selected from the group consisting of silica, γ-alumina, zirconium oxide and silicon carbide, said carrier further characterized in having a surface area, expressed as M 2 /g, of not in excess of one, the contact time between said mixture and said catalyst being less than 1 second.
Claim 2
Dependent Claim
89 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 iridium or rhodium metal catalyst supported on a particulate carrier selected from the group consisting of silica, γ-alumina, zirconium oxide and silicon carbide, said carrier further characterized in having a surface area, expressed as M 2 /g, of not in excess of one, the contact time between said mixture and said catalyst being less than 1 second.
Claim 3
Dependent Claim
13 words
The process in accordance with claim 1 wherein said particulate carrier is silica.
Claim 4
Dependent Claim
13 words
The process in accordance with claim 1 wherein said particulate carrier is γ-alumina.
Claim 5
Dependent Claim
14 words
The process in accordance with claim 1 wherein said particulate carrier is zirconium oxide.
Claim 6
Dependent Claim
14 words
The process in accordance with claim 1 wherein said particulate carrier is silicon carbide.
Claim 7
Dependent Claim
17 words
The process in accordance with claim 2, 3, 4 or 5 wherein the catalyst metal is iridium.
Claim 8
Dependent Claim
17 words
The process in accordance with claim 2, 3, 4 or 5 wherein the catalyst metal is rhodium.
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 |