US4291004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing sulfur dioxide from flue gas
Assignee: Veolia WTS USA Inc
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Filing: 1979-09-28
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Granted: 1981-09-22
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Expires: 1999-09-28
Abstract
Abstract A process for removing sulfur dioxide from flue gas is disclosed which utilizes, as a scrubber sludge dewatering aid, polyethylene oxide or derivative thereof.
Inventors
- 👤 Craig R. McCaffrey
- 👤 Gary O. Barraclough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:30
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/507
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
129 words
A flue gas desulfurization process comprising in sequence: (1) contacting sulfur dioxide-containing flue gas with scrubbing liquor to remove sulfur dioxide therefrom and produce scrubber sludge, (2) subjecting said scrubber sludge to primary dewatering, (3) adding to said scrubber sludge an effective amount as a dewatering aid of polyethylene oxide compound having the formula R--CH.sub.2 CH.sub.2 --O--.sub.X H, where X is about 2-40 and R is OH, sorbitan monooleate--O--, soya amine, ##STR3## where R 1 , R 2 and R 3 are selected from the group consisting of hydrogen and alkyl such that the sum of the total number of carbon atoms in R 1 , R 2 and R 3 is an average of from about 8 to 20, and (4) subjecting said scrubber sludge to secondary dewatering.
Claim 2
Dependent Claim
129 words
A flue gas desulfurization process comprising in sequence: (1) contacting sulfur dioxide-containing flue gas with scrubbing liquor to remove sulfur dioxide therefrom and produce scrubber sludge, (2) subjecting said scrubber sludge to primary dewatering, (3) adding to said scrubber sludge an effective amount as a dewatering aid of polyethylene oxide compound having the formula R--CH.sub.2 CH.sub.2 --O--.sub.X H, where X is about 2-40 and R is OH, sorbitan monooleate--O--, soya amine, ##STR3## where R 1 , R 2 and R 3 are selected from the group consisting of hydrogen and alkyl such that the sum of the total number of carbon atoms in R 1 , R 2 and R 3 is an average of from about 8 to 20, and (4) subjecting said scrubber sludge to secondary dewatering.
Claim 3
Dependent Claim
34 words
The process of claim 1, wherein said dewatering aid is added in a liquid hydrocarbon solvent and is added in an amount of from about 0.5 pound to about 15 pounds/ton of scrubber sludge.
Claim 4
Dependent Claim
10 words
The process of claim 2, wherein X is about 3-15.
Claim 5
Dependent Claim
18 words
The process of claim 3, wherein said primary dewatering step comprises treating said scrubber sludge in a thickener.
Claim 6
Dependent Claim
12 words
The process of claim 4, wherein said secondary dewatering comprises vacuum filtration.
Claim 7
Dependent Claim
29 words
The process of claim 5, wherein said flue gas is produced by an industrial boiler and wherein said scrubbing liquor comprises an aqueous slurry of lime and fly ash.
Claim 8
Dependent Claim
34 words
The process of claim 6, wherein said dewatering aid is added in an amount of from about 2 pounds to about 5 pounds/ton of scrubber sludge, and wherein said liquid hydrocarbon solvent is kerosene.
Claim 9
Dependent Claim
23 words
The process of claim 3 or 7, wherein said scrubber sludge comprises an aqueous slurry of calcium sulfate, calcium sulfite and fly ash.
Claim 10
Dependent Claim
117 words
A flue gas desulfurization process comprising in sequence: (1) contacting sulfur dioxide-containing flue gas with scrubbing liquor to remove sulfur dioxide therefrom and produce scrubber sludge, (2) subjecting said scrubber sludge to primary dewatering, (3) adding to said scrubber sludge an effective amount as a dewatering aid of polyethylene oxide compound having the formula: ##STR4## where R 1 , R 2 and R 3 are selected from the group consisting of hydrogen and alkyl such that the sum of the total number of carbon atoms in R 1 , R 2 and R 3 is from about 8 to 20 and X is from about 1 to 10, and (4) subjecting said scrubber sludge to secondary dewatering.
Claim 11
Dependent Claim
117 words
A flue gas desulfurization process comprising in sequence: (1) contacting sulfur dioxide-containing flue gas with scrubbing liquor to remove sulfur dioxide therefrom and produce scrubber sludge, (2) subjecting said scrubber sludge to primary dewatering, (3) adding to said scrubber sludge an effective amount as a dewatering aid of polyethylene oxide compound having the formula: ##STR4## where R 1 , R 2 and R 3 are selected from the group consisting of hydrogen and alkyl such that the sum of the total number of carbon atoms in R 1 , R 2 and R 3 is from about 8 to 20 and X is from about 1 to 10, and (4) subjecting said scrubber sludge to secondary dewatering.
Claim 12
Dependent Claim
33 words
The process of claim 9, wherein said dewatering aid is added in liquid hydrocarbon solvent and is added in an amount of from about 0.5 pound to about 15 pounds/ton of scrubber sludge.
Claim 13
Dependent Claim
18 words
The process of claim 10, wherein said primary dewatering step comprises treating said scrubber sludge in a thickener.
Claim 14
Dependent Claim
13 words
The process of claim 11, wherein said secondary dewatering step comprises vacuum filtration.
Claim 15
Dependent Claim
33 words
The process of claim 9, wherein X is about 2 to 5 and the total number of carbon atoms in R 1 , R 2 and R 3 is about 10 to 15.
Claim 16
Dependent Claim
26 words
The process of claim 10, wherein said dewatering aid is added in an amount of from about 2 pounds to about 5 pounds/ton of scrubber sludge.
Claim 17
Dependent Claim
18 words
The process of claim 14, wherein said primary dewatering step comprises treating said scrubber sludge in a thickener.
Claim 18
Dependent Claim
13 words
The process of claim 15, wherein said secondary dewatering step comprises vacuum filtration.
Claim 19
Dependent Claim
29 words
The process of claim 16, wherein said flue gas is produced by an industrial boiler and wherein said scrubbing liquor comprises an aqueous slurry of lime and fly ash.
Claim 20
Dependent Claim
21 words
The process of claim 17, wherein said scrubber sludge comprises an aqueous slurry of calcium sulfate, calcium sulfite and fly ash.
Claim 21
Dependent Claim
11 words
The process of claim 18, wherein said hydrocarbon solvent is kerosene.
Claim 22
Dependent Claim
23 words
The process of claim 19, wherein said dewatering aid has the formula C 13 H 27 O(CH 2 CH 2 O) 3 H.
Claim 23
Dependent Claim
79 words
A flue gas desulfurization process comprising in sequence: (1) contacting sulfur dioxide-containing flue gas with scrubbing liquor to remove sulfur dioxide therefrom and produce scrubber sludge, (2) subjecting said scrubber sludge to primary dewatering, PG,28 (3) adding to said scrubber sludge an effective amount as a dewatering aid, polyethylene glycol in liquid hydrocarbon solvent, in an amount of from about 0.5 pounds to about 15 pounds/ton of said scrubber sludge, and (4) subjecting said scrubber sludge to secondary dewatering.
Claim 24
Dependent Claim
79 words
A flue gas desulfurization process comprising in sequence: (1) contacting sulfur dioxide-containing flue gas with scrubbing liquor to remove sulfur dioxide therefrom and produce scrubber sludge, (2) subjecting said scrubber sludge to primary dewatering, PG,28 (3) adding to said scrubber sludge an effective amount as a dewatering aid, polyethylene glycol in liquid hydrocarbon solvent, in an amount of from about 0.5 pounds to about 15 pounds/ton of said scrubber sludge, and (4) subjecting said scrubber sludge to secondary dewatering.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |