Method for reactivating activated carbon and activating carbon
AssigneeEngineering Performance Solutions, LLC
InventorDavid W. Mazyck
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Abstract
The present invention generally relates to a method of thermally reactivating activated carbon via a two-step process: steam followed by pyrolysis; whereby the steam is preferably deoxygenated. Activated carbons reactivated by this method resemble their virgin counterpart's physical characteristics (e.g., BET surface area) and often perform better in water treatment. The present invention also includes a method of reactivating activated carbon via conventional processes (i.e. pyrolysis followed by steam) at low dissolved oxygen (DO) concentrations. The third aspect of the present invention is the activation of carbonaceous material comprising of steam treating the carbonaceous material followed by pyrolysis.
Claims43
A method for reactivating activated carbon, comprising the steps of steam treating the activated carbon followed by pyrolysis, both the steam treatment and pyrolysis being conducted at a temperature within the range of about 400° C. to about 900° C., wherein the steam treatment comprises treating the activated carbon with steam prepared from water having a dissolved oxygen content of less than about 9 mg of oxygen per liter of water.
The method according to claim 9, wherein the steam treatment comprises treating the activated carbon with steam prepared from water having a dissolved oxygen content of less than about 5 mg of oxygen per liter of water.
A method for reactivating activated carbon, comprising the steps of pyrolysis followed by steam treating the activated carbon, both the steam treatment and pyrolysis being conducted at a temperature within the range of about 400° C. to about 900° C., wherein the steam treatment comprises treating the activated carbon with steam prepared from water having a dissolved oxygen content of less than about 9 mg of oxygen per liter of water.
A method for activating a carbonaceous material, comprising the steps of steam treating the carbonaceous material followed by pyrolysis, wherein the steam treating comprises subjecting the carbonaceous material to steam prepared from water having a dissolved oxygen content of less than about 9 mg of oxygen per liter of water.
A method for reactivating activated carbon, comprising the steps of steam treating the activated carbon followed by pyrolysis, both the steam treatment and pyrolysis being conducted at a temperature within the range of about 650° C. to about 850° C. for about 10 to about 60 minutes, wherein the steam treatment comprises treating the activated carbon with steam prepared from water having a dissolved oxygen content of less than about 9 mg of oxygen per liter of water.
Dependencies are inferred from the claim text.