US3888970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double layer catalyst bed for removing so' 2 'from waste gases
Assignee: United States Department of the Interior
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Filing: 1973-02-12
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Granted: 1975-06-10
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Expires: 1993-02-12
Abstract
Abstract Dry waste gas containing SO2 and CO is passed through a double layer bed of catalyst at 400*C. First layer consists of iron, chromium, nickel, manganese, or cobalt, supported on alumina. Second layer consists of alumina.
Inventors
- 👤 Larry A Haas
- 👤 Sanaa E Khalafalla
- 👤 Thomas H Mccormick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:23
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/04; B01J8/0446; B01J8/0449; B01J8/0453; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J23/00; B01J23/70; B01J23/74; B01J23/745; B01J8/0476; B01J8/0488; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0473; C01B17/0486; B01J2208/00; B01J2208/02; B01J2208/023; B01J2208/024; B01J2208/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A PROCESS FOR REMOVING SO2 FROM A DRY WASTE GAS COMPRISING PASSING SAID WASTE GAS THROUGH A SINGLE BED OF CATALYST SAID BED HAVING A TEMPERATURE OF ABOUT 400*C IN THE PRESENCE OF CO, SAID CO AND SO2 BEING PERSENT IN A CO:SO2 MOLE RATIO OF AT LEAST 2:1, SAID BED CONSISTING OF A FIRST AND SECOND LAYER OF CATALYST, SAID FIRST LAYER CONSISTING OF IRON, CHROMIUM, NICKEL, COBALT OR MANGANESE SUPPORTED ON ALUMINA, SAID SECOND LAYER CONSISTING OF ALUMINA, AND WHEREIN SAID GAS ENTERS SAID BED THROUGH SAID FIRST LAYER, PASES THERETHROUGH INTO SAID SECOND LAYER, AND EXITS FROM SAID BED FROM SAID SECOND LAYER.
Claim 2
Dependent Claim
106 words
A PROCESS FOR REMOVING SO2 FROM A DRY WASTE GAS COMPRISING PASSING SAID WASTE GAS THROUGH A SINGLE BED OF CATALYST SAID BED HAVING A TEMPERATURE OF ABOUT 400*C IN THE PRESENCE OF CO, SAID CO AND SO2 BEING PERSENT IN A CO:SO2 MOLE RATIO OF AT LEAST 2:1, SAID BED CONSISTING OF A FIRST AND SECOND LAYER OF CATALYST, SAID FIRST LAYER CONSISTING OF IRON, CHROMIUM, NICKEL, COBALT OR MANGANESE SUPPORTED ON ALUMINA, SAID SECOND LAYER CONSISTING OF ALUMINA, AND WHEREIN SAID GAS ENTERS SAID BED THROUGH SAID FIRST LAYER, PASES THERETHROUGH INTO SAID SECOND LAYER, AND EXITS FROM SAID BED FROM SAID SECOND LAYER.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said first layer is iRon supported on alumina.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein said waste gas is first passed through a coke bed at a temperature of about 500*C so as to produce said CO.
Claim 5
Dependent Claim
14 words
The process of claim 3 wherein said first layer is iron supported on alumina.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein said first and second layers are present in a weight ratio of about 2:1.
Claim 7
Dependent Claim
20 words
The process of claim 4 wherein said first and second layers are present in a weight ratio of about 2:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |