US3846535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for absorbing sulfur oxides from gaseous mixtures and regenerating the absorbent
Assignee: C0NSOLIDATION COAL Co
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Filing: 1972-09-05
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Granted: 1974-11-05
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Expires: 1992-09-05
Abstract
Abstract A method for absorbing sulfur oxides from gaseous mixtures containing sulfur oxides using a sodium bicarbonate or potassium bicarbonate absorbent and regenerating the absorbent.
Inventors
- 👤 A Fonseca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:58
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501; C01C; C01C1/00; C01C1/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A PROCESS FOR ABSORBING SULFUR OXIDES FROM GASEOUS MIXTURES CONTAINING SULFUR OXIDES AND REGENERATING THE ADSORBENT COMPRISING SEQUENTIALLY: A. CONTACTING SAID GASEOUS MIXTURE WITH AN ADSORBENT SELECTED FROM THE GROUP CONSISTING OF SODIUM BICARBONATE AND POTASSIUM BICARBONATE, B. ADMIXING THE RESULTING SODIUM OR POTASSIUM SULFITE, SULFATE, AND COMBINATIONS THEREOF WITH WATER AND AMMONIUM BICARBONATE OR AMMONIA AND CARBON DIOXIDE, C. SEPARATING THE RESULTING SODIUM OR POTASSIUM BICARBONATE AND THE RESULTING AMMONIUM SULFITE, SULFATE, AND COMBINATIONS THEREOF D. REACTING THE SEPARATED AMMONIUM SULFITE, SULFATE, AND COMBINATIONS THEREOF WITH AN ALKALINE EARTH METAL OXIDE OR AN ALKALINE EARTH METAL HYDROXIDE, AND E. SEPARATING THE RESULTING AMMONIA AND THE RESULTING ALKALINE EARTH METAL SULFITE, SULFATE, AND COMBINATIONS THEREOF.
Claim 2
Dependent Claim
115 words
A PROCESS FOR ABSORBING SULFUR OXIDES FROM GASEOUS MIXTURES CONTAINING SULFUR OXIDES AND REGENERATING THE ADSORBENT COMPRISING SEQUENTIALLY: A. CONTACTING SAID GASEOUS MIXTURE WITH AN ADSORBENT SELECTED FROM THE GROUP CONSISTING OF SODIUM BICARBONATE AND POTASSIUM BICARBONATE, B. ADMIXING THE RESULTING SODIUM OR POTASSIUM SULFITE, SULFATE, AND COMBINATIONS THEREOF WITH WATER AND AMMONIUM BICARBONATE OR AMMONIA AND CARBON DIOXIDE, C. SEPARATING THE RESULTING SODIUM OR POTASSIUM BICARBONATE AND THE RESULTING AMMONIUM SULFITE, SULFATE, AND COMBINATIONS THEREOF D. REACTING THE SEPARATED AMMONIUM SULFITE, SULFATE, AND COMBINATIONS THEREOF WITH AN ALKALINE EARTH METAL OXIDE OR AN ALKALINE EARTH METAL HYDROXIDE, AND E. SEPARATING THE RESULTING AMMONIA AND THE RESULTING ALKALINE EARTH METAL SULFITE, SULFATE, AND COMBINATIONS THEREOF.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said absorbent is sodium bicarbonate and sodium sulfite, sulfate, and combinations thereof are produced.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein said alkaline earth metal oxides and hydroxides are selected from the group consisting of calcium oxide, calcium hydroxide, barium oxide and barium hydroxides.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein said metal bicarbonate is recycled and reused as the adsorbent of (a).
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein said ammonia from (d) is recycled to (b).
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |