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AssigneeYissum Research Development Company of the Hebrew University of Jerusalem
InventorsYoel Sasson, Tatyana Sachs, Effi Dvash, Zach Barnea
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Provided is a process for controlling heavy metal (e.g., mercury) emission in S02-containing flue gas, comprising passing a stream of the flue gas (2) through a wet scrubber (1) where it is brought into contact with a liquid absorbent (8) comprising an ionic liquid, an oxidizer (11) and polar protic organic solvent, wherein the amount of said organic solvent is adjusted such that the SO2 absorption is minimized while operating said wet scrubber at a temperature lower than the normal working temperature that would be used in the absence of said solvent. The process may be preceded by an initial stage where a fluoride-containing liquid is used for reducing the amount of sulfur dioxide in the flue gas stream; the sulfur dioxide can be subsequently desorbed from the fluoride-containing liquid upon the addition of a polar solvent.
1) A process for controlling heavy metal emission in SO2-containing flue gas, comprising passing a stream of the flue gas through a wet scrubber where it is brought into contact with a liquid absorbent comprising an ionic liquid, an oxidizer and polar protic organic solvent, wherein the amount of said organic solvent is adjusted such that the S02 absorption is minimized while operating said wet scrubber at a working temperature lower than the normal working temperature that would be used in the absence of said solvent.
17) A process for removing sulfur dioxide from gaseous mixtures, comprising contacting said gaseous mixture with a liquid absorbent comprising one or more fluoride salts, adding a polar solvent to said absorbent to remove the sulfur dioxide from said absorbent and regenerating the absorbent.
24) A process for controlling metal emission in S02-containing flue gas, comprising passing a stream of the flue gas through a wet scrubber where it is brought into contact with a liquid absorbent comprising a ionic liquid and an oxidizer, wherein the molar ratio between the oxidizer and the ionic liquid is not less than 1:2, and wherein the absorption temperature is from 20° C. to 35° C.
25) A process for controlling heavy metal emission in S02-containing flue gas, comprising passing a stream of the flue gas through a wet scrubber where it is brought into contact with a liquid absorbent comprising an ionic liquid and an oxidizer, wherein at least one organic acid is present in the liquid absorbent.
Dependencies are inferred from the claim text.