Process for removing mercury from a gas
AssigneeAkzo NVV.
InventorsGeert J. deJong, Hendrik J. Vos
Life of this patent
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Abstract
Mercury is removed from gases containing mercury vapor by passing the gases continuously through a bed of activated carbon on which a halogen is adsorbed. The bed may have a thickness of at most 5 cm. The chlorine content of the active carbon is maintained between 5% and 12% by weight. This is preferably effected by adding chlorine to the gases in an amount such that the carbon is caused to absorb a quantity thereof which equals the quantity that is consumed during the adsorption of mercury.
Claims7
In a process for removing mercury gases containing mercury vapor which comprises contacting these gases with activated carbon on which a halogen is adsorbed, the improvement which comprises flowing a gas to be freed from mercury vapor continuously through a bed of activated carbon having a maximum thickness of 5 cm and having chlorine adsorbed thereon, and maintaining the chlorine content of the activated carbon in the range of from 5 to 12% by weight based on the weight of the carbon during the passage of the gas through the activated carbon bed by continuously or periodically supplying the bed with a replenishing amount of chlorine.
A process for improving the adsorption of mercury vapor by a filter from a gas passing through said filter containing activated carbon having chlorine adsorbed thereon which comprises supplying the activated carbon filter with a replenishing amount of chlorine thereby maintaining the chlorine content of the activated carbon between about 5% and 12% by weight based on the weight of activated carbon.
Dependencies are inferred from the claim text.