US4100258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sodium aluminate to reduce flue gas corrosion
Assignee: ChampionX LLC
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Filing: 1976-04-19
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Granted: 1978-07-11
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Expires: 1996-04-19
Abstract
Abstract SO 3 is removed from flue gas by injecting liquid sodium aluminate, achieving essentially complete SO 3 removal.
Inventors
- 👤 Peter H. Vossos
- 👤 Morris Mindick
- 👤 Larry P. Koskan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:13
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501
Claims Analysis
Total Claims: 9
Claim 3
Independent Claim
115 words
The method of treating flue gas, delivered to a stack, to remove an entrained sulfur-containing compound selected from the group consisting of oxides of sulfur and sulfuric acid derived from burning the fuel, comprising the step of spraying the flue gas, before it reaches the stack, with droplets of an aqueous solution of sodium aluminate (Na 2 O.Al 2 O 3 ), the ratio of Na 2 0:Al 2 O 3 being greater than 1 to assure a stabilized solution and in which the sodium aluminate used is in an amount effective to remove at least a significant portion of the sulfur-containing compound by virtue of being converted to the sulfates of sodium and aluminum.
Claim 4
Independent Claim
115 words
The method of treating flue gas, delivered to a stack, to remove an entrained sulfur-containing compound selected from the group consisting of oxides of sulfur and sulfuric acid derived from burning the fuel, comprising the step of spraying the flue gas, before it reaches the stack, with droplets of an aqueous solution of sodium aluminate (Na 2 O.Al 2 O 3 ), the ratio of Na 2 0:Al 2 O 3 being greater than 1 to assure a stabilized solution and in which the sodium aluminate used is in an amount effective to remove at least a significant portion of the sulfur-containing compound by virtue of being converted to the sulfates of sodium and aluminum.
Claim 5
Dependent Claim
48 words
The method of claim 1 in which the ratio is in the range of 1.1 - 1.5 and in which the amount of treatment on a dry basis is at least 0.05 pounds sodium aluminate, contained is solution, per pound of entrained compound calculated as SO 3 .
Claim 6
Dependent Claim
14 words
The method of claim 1 applied at the cold end of a boiler installation.
Claim 7
Dependent Claim
37 words
The method of claim 1 in which the amount of treatment, per pound of entrained SO 3 , is in the range of 0.05 - 4.4 pounds of Na 2 O.Al 2 O 3 contained in solution.
Claim 8
Dependent Claim
34 words
The method of claim 4 in which the liquid sodium aluminate is injected into a stream of flue gas downstream of the economizer and upstream of the air heater present in a boiler installation.
Claim 9
Dependent Claim
41 words
Method according to claim 1 in which the liquid sodium aluminate is prepared by commencing with an aqueous solution of sodium aluminate, approximately 32-50% solids, and diluting that solution with an additional amount of water, up to 100 volumes of water.
Claim 10
Dependent Claim
41 words
Method according to claim 2 in which the liquid sodium aluminate is prepared by commencing with an aqueous solution of sodium aluminate, approximately 32-50% solids, and diluting that solution with an additional amount of water, up to 100 volumes of water.
Claim 11
Dependent Claim
41 words
Method according to claim 4 in which the liquid sodium aluminate is prepared by commencing with an aqueous solution of sodium aluminate, approximately 32-50% solids, and diluting that solution with an additional amount of water, up to 100 volumes of water.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |