US4108969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the removal of SO2 from a stack gas, absorptive medium for use in process and process for preparing the absorptive medium
Assignee: Individual
•
Filing: 1976-07-27
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Granted: 1978-08-22
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Expires: 1996-07-27
Abstract
Abstract A stack gas, generally from a sulfuric acid plant, containing SO 2 , is contacted with an absorptive medium prepared by wetting at least the surface of a first metal selected from aluminum, magnesium and manganese with a second metal selected from mercury, indium, gallium and alloys of indium/gallium and contacting the wetted first metal with SO 2 , in a solvent medium in the presence of an excess of hydrogen ions until the first metal erodes and is taken up by the solution as a result of the reaction which takes place. The absorptive medium thus formed has the ability to absorb SO 2 at lower temperatures and thereafter desorb SO 2 at increased temperature and/or with inert gas stripping. The SO 2 enriched gas stream obtained as a result of the desorption process can be recycled to the sulfuric acid plant.
Inventors
- 👤 George G. Merkl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:32
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; B01D53/1456; B01D53/1481; C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
A process for producing an absorptive medium capable of removing quantities of SO 2 from gas streams which comprises: contacting activated aluminum with SO 2 gas in an aqueous medium at a pH between about 0.5 and 4.0 and at a temperature between about 40° F and 120° F until a solution is formed having a specific gravity between about 1.05 and 1.5; and thereafter removing any unreacted aluminum and precipitated or suspended material from said soltuion; said activated aluminum having been formed by wetting substantially pure aluminum with a second metal selected from the group consisting of mercury, indium, gallium and alloys of indium/gallium in the presence of a source of protons selected from aqueous acid solutions and aqueous alkaline solutions until at least the surface layer of said aluminum has been permeated with said second metal.
Claim 2
Dependent Claim
138 words
A process for producing an absorptive medium capable of removing quantities of SO 2 from gas streams which comprises: contacting activated aluminum with SO 2 gas in an aqueous medium at a pH between about 0.5 and 4.0 and at a temperature between about 40° F and 120° F until a solution is formed having a specific gravity between about 1.05 and 1.5; and thereafter removing any unreacted aluminum and precipitated or suspended material from said soltuion; said activated aluminum having been formed by wetting substantially pure aluminum with a second metal selected from the group consisting of mercury, indium, gallium and alloys of indium/gallium in the presence of a source of protons selected from aqueous acid solutions and aqueous alkaline solutions until at least the surface layer of said aluminum has been permeated with said second metal.
Claim 3
Dependent Claim
38 words
The process of claim 1 wherein the pH of the aqueous medium is maintained within the range of from 1.5 to 3.5 by regulating the flow of the source of SO 2 gas and surface area of aluminum.
Claim 4
Dependent Claim
8 words
The product of the process of claim 1.
Claim 5
Dependent Claim
8 words
The product of the process of claim 2.
Claim 6
Dependent Claim
26 words
An absorptive material capable of absorbing quantities of SO 2 and releasing the absorbed SO 2 upon being heated which is prepared by the steps of:
Claim 7
Dependent Claim
26 words
An absorptive material capable of absorbing quantities of SO 2 and releasing the absorbed SO 2 upon being heated which is prepared by the steps of:
Claim 8
Dependent Claim
32 words
wetting at least the surface of aluminum with a metal selected from mercury, indium, gallium and alloys of indium/gallium, and 2. thereafter, contacting said wetted aluminum with SO 2 gas in water.
Claim 9
Dependent Claim
32 words
wetting at least the surface of aluminum with a metal selected from mercury, indium, gallium and alloys of indium/gallium, and 2. thereafter, contacting said wetted aluminum with SO 2 gas in water.
Claim 10
Dependent Claim
11 words
The absorptive medium of claim 5 wherein said metal is mercury.
Claim 11
Dependent Claim
35 words
The absorptive medium of claim 5 wherein the pH water is maintained within the range of from about pH 2 to about pH 4 by regulating the flow of the source of SO 2 gas.
Claim 12
Dependent Claim
31 words
The absorptive medium of claim 5 wherein the pH is maintained between about pH 1.5 to about pH 3.5, and the temperature is maintained between about 40° F and 110° F.
Claim 13
Dependent Claim
21 words
The absorptive medium of claim 5 wherein the specific gravity of said absorptive medium lies between about 1.05 to about 1.5.
References Cited (Backward Citations)
US4012487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-21 | 1982-02-20 | 1982-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-21 | 1986-02-20 | 1986-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-21 | 1990-02-20 | 1990-08-22 | $7700.00 | Window Closed / Lapsed |