US4626418A
Expired / Lapsed
US
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Removal of SO2 from SO2 -containing gases
Assignee: Carmeuse North America Services Inc
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Filing: 1985-09-26
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Granted: 1986-12-02
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Expires: 2005-09-26
Abstract
Abstract A process for the removal of SO2 from a gaseous mixture containing SO2 which comprises contacting said gaseous mixture containing SO2 with a mixture containing a sugar and at least one alkaline earth compound selected from the group consisting of calcium and magnesium carbonates, oxides and hydroxides.
Inventors
- 👤 John W. College
- 👤 Joseph Vlnaty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:27
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
100 words
A dry process for the removal of SO 2 from a gaseous mixture containing SO 2 which comprises contacting said gaseous mixture containing SO 2 with a mixture containing at least one alkaline earth compound selected from the group consisting of calcium and magnesium carbonates, oxides and hydroxides and from about 0.01 to about 12 weight percent sugar at a temperature in the range of about 100° to about 2400° F., with the mols of said alkaline earth compound relative to the mols of SO 2 in said gaseous mixture being in the range of about 0.5:1 to about 3:1.
Claim 2
Dependent Claim
100 words
A dry process for the removal of SO 2 from a gaseous mixture containing SO 2 which comprises contacting said gaseous mixture containing SO 2 with a mixture containing at least one alkaline earth compound selected from the group consisting of calcium and magnesium carbonates, oxides and hydroxides and from about 0.01 to about 12 weight percent sugar at a temperature in the range of about 100° to about 2400° F., with the mols of said alkaline earth compound relative to the mols of SO 2 in said gaseous mixture being in the range of about 0.5:1 to about 3:1.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said gaseous mixture contains SO 2 , oxygen, carbon dioxide and nitrogen.
Claim 4
Dependent Claim
42 words
The process of claim 1 wherein said sugar is a carbohydrate havbing a chain of 2 to 7 carbon atoms, with one of the carbon atoms carrying aldehydic or ketonic oxygen and the remaining carbon atoms bearing hydrogen atoms and hydroxyl groups.
Claim 5
Dependent Claim
17 words
The process of claim 3 wherein said sugar has a chain of 5 to 6 carbon atoms.
Claim 6
Dependent Claim
23 words
The process of claim 3 wherein said sugar is selected from the group consisting of glucous, fructose, sucrose, maltose, lactose and mixtures thereof.
Claim 7
Dependent Claim
23 words
The process of claim 1 wherein said mixture of alkaline earth compound and sugar contains about 0.05 to about 2.0 weight percent sugar.
Claim 8
Dependent Claim
28 words
The process of claim 1 wherein said mixture of alkaline earth compound and sugar is obtained by mixing the alkaline earth compound and sugar in the solid form.
Claim 9
Dependent Claim
36 words
The process of claim 1 wherein said mixture of alkaline earth compound and sugar is obtained by dissolving sugar in water, adding the alkaline compound thereto, and then drying the resulting slurry to remove water therefrom.
Claim 10
Dependent Claim
37 words
The process of claim 1 wherein said mixture of alkaline earth compound and sugar is obtained by dissolving sugar in water, converting the water to steam and then adding alkaline earth compound to the resulting gaseous mixture.
Claim 11
Dependent Claim
25 words
The process of claim 1 wherein said mixture of alkaline earth compound and sugar is obtained by adding alkaline earth compound and sugar to steam.
Claim 12
Dependent Claim
28 words
The process of claim 1 wherein said mixture of alkaline earth compound and sugar are in the form of particles having an average diameter below about 180 microns.
Claim 13
Dependent Claim
34 words
The process of claim 11 wherein said mixture of alkaline earth compound and sugar are in the form of particles having an average diameter in the range of about 2 to about 80 microns.
Claim 14
Dependent Claim
29 words
The process of claim 1 wherein said gaseous mixture is treated with said mixture of alkaline earch compound and sugar at a temperature of 100° to about 900° F.
Claim 15
Dependent Claim
49 words
The process of claim 1 wherein said gaseous mixture is treated with said mixture of alkaline earth compound and sugar so that the mols of alkaline earth compound relative to the mols of SO 2 in said gaseous mixture is in the range of about 1:1 to about 2:1.
Claim 16
Dependent Claim
29 words
The process of claim 1 wherein said contact is effected by spray injecting said mixture of alkaline earth compound and sugar into said gaseous mixture containing SO 2 .
Claim 17
Dependent Claim
28 words
The process of claim 1 wherein said contact is effected by passing said gaseous stream containing SO 2 through a fluid bed containing alkaline earth compound and sugar.
Claim 18
Dependent Claim
28 words
The process of claim 1 wherein said contact is effected by passing said gaseous stream containing SO 2 through a fixed bed containing alkaline earth compound and sugar.
Claim 19
Dependent Claim
66 words
The process of claim 1 wherein the mixture of alkaline earth compound and sugar contains from about 0.05 to about 2 weight percent sugar, the temperature is in the range of about 100° to about 900° F., with the mols of said alkaline earth compound relative to the mols of SO 2 in said gaseous mixture being in the range of about 1:1 to about 2:1.
Claim 20
Dependent Claim
22 words
The process of claim 1 wherein said mixture of alkaline earth compound and sugar contains Ca(OH) 2 , Mg(OH) 2 and sugar.
Claim 21
Dependent Claim
22 words
The process of claim 18 wherein said mixture of alkaline earth compound and sugar contains Ca(OH) 2 , Mg(OH) 2 and sugar.
Claim 22
Dependent Claim
10 words
The process of claim 19 wherein said sugar is sucrose.
Claim 23
Dependent Claim
10 words
The process of claim 20 wherein said sugar is sucrose.
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) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |