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US 7,771,683 B2Granted
Air pollution control
AssigneeSolucorp Industries, Ltd.
InventorPeter J. Hurley
Life of this patent
Estimating the term…
Abstract
In a method of controlling air pollution, a combustion gas is passed through a slurry of an alkaline-earth metal sulfide and a redox buffer (e.g., a phosphate), preferably in combination with an alkaline-earth metal carbonate and/or hydroxide. A composition for removing a heavy metal from a combustion gas is also provided, as an aerosolized, aqueous dispersion or slurry of an alkaline-earth metal sulfide and a buffering agent. A solid residue of the air pollution control process is also described.
Claims26
A method for controlling air pollution, comprising:
- allowing a combustion gas to contact an aqueous, 20-50% w/w solids dispersion of an alkaline-earth metal sulfide and a buffering agent, wherein the buffering agent is selected from the group consisting of phosphoric acid, salts of phosphoric acid, alkaline-earth metal-based pH buffers, and mixtures thereof.
A method for controlling air pollution, comprising
- forming an effluent containing at least one heavy metal sulfide by injecting an aqueous, 20-50% w/w solids dispersion into a combustion gas containing at least one heavy metal, the dispersion comprising an alkaline-earth metal sulfide and a buffering agent selected from the group consisting of phosphoric acid, salts of phosphoric acid, alkaline-earth metal-based pH buffers, and mixtures thereof;
- and
- collecting the effluent.
Dependencies are inferred from the claim text.