US3812236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of ammonia and organic impurities from an ammonia plant effluent
Assignee: Standard Oil Co
•
Filing: 1972-06-22
•
Granted: 1974-05-21
•
Expires: 1992-06-22
Abstract
Abstract Ammonia and organic impurities are removed from an ammonia plant effluent consisting mainly of steam by treating the effluent with an oxidation catalyst which oxidizes the impurities to harmless products of nitrogen, water and carbon dioxide.
Inventors
- 👤 H Adams
- 👤 K Kunchal
- 👤 J Callahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8634; C; C01; C01C; C01C1/00; C01C1/02; C01C1/12; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
26 words
The process of claim 1 wherein said impure aqueouS stream is contacted with said oxidation catalyst at a temperature of about 700* to about 1,000* F.
Claim 2
Dependent Claim
22 words
The process of claim 1 additionally comprising adding molecular oxygen to said stripped gaseous stream prior to contact with the oxidation catalyst.
Claim 3
Dependent Claim
22 words
The process of claim 1 additionally comprising the step of recycling said pure gaseous stream to the hot potassium carbonate recovery column.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein said stripped gaseous stream contains less than about 5 percent by volume of impurities.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |