Gas desulphurization
First Claim
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1. 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.
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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.
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Citations
18 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6)
- to 1300°
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7. 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. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- C to 1300°
Specification