US4115518A
Expired / Lapsed
US
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Gas desulphurization
Assignee: Unibra SA
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Filing: 1975-11-04
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Granted: 1978-09-19
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Expires: 1995-11-04
Abstract
Abstract A desulphurization reagent comprising an intimate mixture, in the solid state, of a main component selected from the group consisting of alkaline-earth, oxides, hydroxides, carbonates, bicarbonates, and mixtures, thereof, and an additive selected from the group consisting of hydrogen halide acids, salts of such acids of alkaline metals, ammonium, and alkaline-earth metals, sulphuric acid, and mixtures thereof, said additive being present in an amount of from 0.1 to 15% by mole respect to said main component.
Inventors
- 👤 Bernard Delmon
- 👤 Ghislain Van Houte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:29
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/04; B01J20/043; B01D; B01D53/00; B01D53/14; B01D53/1493; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; B01J20/046; B01J20/28; B01J20/28002; B01J20/28004; B01J20/30; B01J20/32; B01J20/3231; B01J20/3234; B01J20/3236
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
95 words
A method for desulfurizing flue gases wherein said gases are contacted at a temperature of 250° to 1300° C with a reagent in powdered form consisting of a main component selected from the group consisting of calcium, magnesium and mixed calcium and magnesium oxides, hydroxides and carbonates, said main component being impregnated with an additive in an amount of from 0.1 to 15% by mole, said additive being selected from the group consisting of hydrochloric acid, hydrobromic acid and sulfuric acid followed by drying, thus converting said reagent into a sulfate and recovering said sulfate.
Claim 2
Independent Claim
95 words
A method for desulfurizing flue gases wherein said gases are contacted at a temperature of 250° to 1300° C with a reagent in powdered form consisting of a main component selected from the group consisting of calcium, magnesium and mixed calcium and magnesium oxides, hydroxides and carbonates, said main component being impregnated with an additive in an amount of from 0.1 to 15% by mole, said additive being selected from the group consisting of hydrochloric acid, hydrobromic acid and sulfuric acid followed by drying, thus converting said reagent into a sulfate and recovering said sulfate.
Claim 3
Dependent Claim
19 words
A method according to claim 1 wherein said contact is effected at a temperature from 350° to 600° C.
Claim 4
Dependent Claim
88 words
The method according to claim 1 wherein said reagent is a desulfurization reagent consisting of an intimate mixture of a main component selected from the group consisting of alkaline earth oxides, hydroxides, carbonates, bicarbonates and mixtures thereof, said main component being first impregnated with an additive selected from the group consisting of hydrochloric acid, hydrobromic acid and sulfuric acid and mixtures thereof, said additive being present in an amount of from 0.1 to 10% by mole with respect to said main component, and then dried prior to use.
Claim 5
Dependent Claim
15 words
The method according to claim 3 wherein in said reagent said additive is a chloride.
Claim 6
Dependent Claim
15 words
The method according to claim 3 wherein in said reagent said additive is sulphuric acid.
Claim 7
Dependent Claim
17 words
The method according to claim 5 wherein in said reagent said main component is a magnesium compound.
Claim 8
Independent Claim
99 words
A method for desulfurizing flue gases wherein said gases are contacted with a reagent in powdered form consisting of a solid main component selected from the group consisting of alkaline earth oxides, hydroxides, and carbonates, bicarbonates, and mixtures thereof and a solid additive in an amount of from 0.1 to 15% by mole, selected from the group consisting of the chloride and bromide salts of alkali metals, ammonium, and alkaline-earth metals, at a temperature of 250° C to 1300° C, thus converting said reagent into a sulfate salt of calcium, magnesium or a mixture thereof, and recovering said sulfate.
Claim 9
Independent Claim
99 words
A method for desulfurizing flue gases wherein said gases are contacted with a reagent in powdered form consisting of a solid main component selected from the group consisting of alkaline earth oxides, hydroxides, and carbonates, bicarbonates, and mixtures thereof and a solid additive in an amount of from 0.1 to 15% by mole, selected from the group consisting of the chloride and bromide salts of alkali metals, ammonium, and alkaline-earth metals, at a temperature of 250° C to 1300° C, thus converting said reagent into a sulfate salt of calcium, magnesium or a mixture thereof, and recovering said sulfate.
Claim 10
Dependent Claim
19 words
A method according to claim 7 wherein said contact is effected at a temperature from 600° to 1100° C.
Claim 11
Dependent Claim
30 words
A method according to claim 7 wherein the oxygen content of the flue gases is adjusted to at least half a mole O 2 per each mole SO 2 .
Claim 12
Dependent Claim
18 words
The method according to claim 7, wherein said flue gases are circulated through a bed of said reagent.
Claim 13
Dependent Claim
15 words
The method according to claim 7 wherein the temperature is 350° C to 600° C.
Claim 14
Dependent Claim
19 words
The method according to claim 7 wherein contacting is continued until all said reagent is converted into a sulfate.
Claim 15
Dependent Claim
83 words
The method according to claim 7 wherein said reagent is a desulphurization reagent consisting of an intimate mixture, in a solid state, of a main component selected from the group consisting of alkaline-earth oxides, hydroxides, carbonates, bicarbonates, and mixtures thereof, and an additive selected from the group consisting of chloride and bromide salts with alkali metals, ammonium, and alkaline-earth metals, and mixtures thereof, said additive being present in an amount of from 0.1 to 10% by mole with respect to said main component.
Claim 16
Dependent Claim
31 words
The method according to claim 13 wherein in said reagent said main component is selected from the group consisting of calcium, magnesium, and mixed calcium and magnesium oxides, hydroxides and carbonates.
Claim 17
Dependent Claim
32 words
The method according to claim 13 wherein in said reagent said main component is CaCO 3 and said additive is selected from the group consisting of CaCl 2 , KCl, or NaCl.
Claim 18
Dependent Claim
26 words
The method according to claim 13 wherein in said reagent the amount of said additive is from 0.1 to 5% with respect to said main component.
Claim 19
Dependent Claim
26 words
The method according to claim 16 wherein said reagent is in the form of a powder with an average grain size from 1 to 200 microns.
Claim 20
Dependent Claim
35 words
The method according to claim 13 wherein said reagent is obtained by impregnating said main component in powdered form with a solution of said additive in a solvent and then drying to remove said solvent.
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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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |