Process for removing sulfur oxide and nitrogen oxide
AssigneeUop LLC
InventorAlakananda Bhattacharyya
Life of this patent
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Abstract
A process for the production of an alkaline earth metal, aluminum-containing spinel/clay composition comprises: (a) combining (1) an acidic, aluminum-containing composition in which the aluminum is present in a positively charged species, and (2) a basic, alkaline earth metal-containing composition to form a gel mixture; (b) mixing the gel with kaolin clay to form a co-gel; and (c) calcining the co-gel mixture to form the alkaline earth metal, aluminum-containing spinel composition in a clay matrix. Alkaline earth metal, aluminum-containing spinel/clays having both high surface areas and very high attrition resistance, and processes for using spinel/clay compositions, e.g., as sulfur oxide and nitrogen oxide removal agent, are also disclosed.
Claims14
In a process for reducing at least one of (1) the sulfur oxide content of a sulfur oxide-containing gas and (2) the nitrogen oxide content of a nitrogen oxide-containing gas which includes contacting said gas with a material at conditions to reduce at least one of (1) the sulfur oxide content of said gas and (2) the nitrogen oxide content of said gas, the improvement comprising utilizing as at least a portion of said material the spinel/clay composition produced in accordance with the process comprising:
- (a) combining (1) an acidic, aluminum-containing composition in which the aluminum is present in a positively charged species, and (2) a basic alkaline earth metal-containing composition to form a gel mixture;
- and
- (b) mixing the gel with kaolin clay to form a co-gel mixture;
- and
- (c) calcining said co-gel mixture to form said alkaline earth metal, aluminum-containing spinel composition, in a kaolin clay matrix.
In a process for reducing at least one of (1) the sulfur oxide content of a sulfur oxide-containing gas and (2) the nitrogen oxide content of a nitrogen oxide-containing gas which includes contacting said gas with a material at conditions to reduce at least one of (1) the sulfur oxide content of said gas and (2) the nitrogen oxide content of said gas, the improvement comprising utilizing as at least a portion of said material the spinel/clay composition produced in accordance with the process comprising:
- (a) combining (1) an acidic, aluminum-containing composition in which the aluminum is present in a positively charged species;
- (2) a basic, alkaline earth metal-containing composition to form a co-gel mixture;
- (b) optionally, mixing the co-gel mixture with additional kaolin clay;
- and
- (c) calcining said co-gel mixture to form said alkaline earth metal, aluminum-containing spinel composition in a kaolin clay matrix.
Dependencies are inferred from the claim text.