Process for regenerating a spent sorbent
First Claim
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1. A method for restoring mercury sorption effectiveness of a carbon sorbent, the method comprising:
- exposing the carbon sorbent to a salt solution comprising at least one of bromine, a bromine compound, or a combination thereof, wherein exposing includes removing contaminants collected on the carbon sorbent and wherein exposing includes modifying a carbon edge structure to form carbocations such that the modified carbon edge structure accepts electrons from neutral mercury atoms, the salt solution having an associated cation, and wherein the associated cation is an ammonium, aluminum, boron, zinc, or iron cation;
dewatering to remove the carbon sorbent from the salt solution, wherein dewatering produces water; and
drying the carbon sorbent.
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Abstract
A method and apparatus is provided for regenerating a sorbent that has been poisoned by components derived from flue gas. The sorbent is treated with an agent to remove the poisoning components and introduce a promoting agent into the sorbent. The method and apparatus can also be used to enhance the effectiveness of a new sorbent.
44 Citations
20 Claims
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1. A method for restoring mercury sorption effectiveness of a carbon sorbent, the method comprising:
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exposing the carbon sorbent to a salt solution comprising at least one of bromine, a bromine compound, or a combination thereof, wherein exposing includes removing contaminants collected on the carbon sorbent and wherein exposing includes modifying a carbon edge structure to form carbocations such that the modified carbon edge structure accepts electrons from neutral mercury atoms, the salt solution having an associated cation, and wherein the associated cation is an ammonium, aluminum, boron, zinc, or iron cation; dewatering to remove the carbon sorbent from the salt solution, wherein dewatering produces water; and drying the carbon sorbent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for restoring mercury sorption effectiveness of a carbon sorbent used for treating a flue gas, the method comprising:
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contacting at least a portion of the carbon sorbent with a solution, the solution comprising at least one of bromine, a bromine compound, or a combination thereof, wherein contacting includes removing contaminants collected on at least a portion of the carbon sorbent, wherein contacting includes modifying a carbon edge structure of the carbon sorbent to form carbocations such that the modified carbon edge structure accepts electrons from neutral mercury atoms, and wherein the solution includes an associated cation, the associated cation being an ammonium, aluminum, boron, zinc, or iron cation; and removing the carbon sorbent from the solution. - View Dependent Claims (16, 17, 18, 19)
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20. A method for restoring mercury sorption effectiveness of a carbon sorbent used for treating a gas, the method comprising:
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contacting at least a portion of the carbon sorbent with a solution, the solution comprising at least one of bromine, a bromine compound, or a combination thereof, wherein contacting includes removing contaminants collected on at least a portion of the carbon sorbent, wherein contacting includes modifying a carbon edge structure of the carbon sorbent to form carbocations such that the modified carbon edge structure accepts electrons from neutral mercury atoms, and wherein the solution includes an associated cation, the associated cation being an ammonium, aluminum, boron, zinc, or iron cation; and removing the carbon sorbent from the solution.
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Specification