Process for removing sulfur oxides and nitrogen oxides from flue gases using halogen-impregnated actuated carbon with simultaneous injection of ammonia
First Claim
1. A process for removing at least one nitrogen oxide or sulfur oxide from a flue gas comprising contacting the flue gas in the presence of oxygen with a bed of carbonaceous material selected from the group consisting of activated carbon, graphite, carbonized char and amorphous carbon, said carbonaceous material being impregnated with a halogen or halogen compound selected from the group consisting of iodine, bromine, chlorine, ammonium iodide, ammonium bromide, ammonium chloride, hydrogen iodide, hydrogen bromide and hydrogen chloride, said bed containing at least 0.01 gram of said halogen or at least 0.01 gram of said halogen compound measured in terms of the halogen content of said halogen compound per kilogram of said carbonaceous material, said flue gas being contacted with said bed at a temperature at which the ammonium salt of said halogen or the ammonium salt of the halogen component of said halogen compound can be adsorbed by said carbonaceous material, and simultaneously feeding to said bed ammonia or a compound capable of liberating ammonia at the temperature at which the flue gas contacts said bed so that ammonia contacts said carbonaceous material as said flue gas contacts said carbonaceous material, thereby removing said at least one nitrogen oxide or sulfur oxide from said flue gas.
0 Assignments
0 Petitions
Accused Products
Abstract
Carbonaceous materials are impregnated with bromine, chlorine, iodine or their compounds, and brought in contact with a flue gas in the presence of ammonia, whereby nitrogen oxides and sulfur oxides contained in the flue gas are trapped by the carbonaceous materials and can be removed from the flue gas with a very high percent removal.
118 Citations
28 Claims
- 1. A process for removing at least one nitrogen oxide or sulfur oxide from a flue gas comprising contacting the flue gas in the presence of oxygen with a bed of carbonaceous material selected from the group consisting of activated carbon, graphite, carbonized char and amorphous carbon, said carbonaceous material being impregnated with a halogen or halogen compound selected from the group consisting of iodine, bromine, chlorine, ammonium iodide, ammonium bromide, ammonium chloride, hydrogen iodide, hydrogen bromide and hydrogen chloride, said bed containing at least 0.01 gram of said halogen or at least 0.01 gram of said halogen compound measured in terms of the halogen content of said halogen compound per kilogram of said carbonaceous material, said flue gas being contacted with said bed at a temperature at which the ammonium salt of said halogen or the ammonium salt of the halogen component of said halogen compound can be adsorbed by said carbonaceous material, and simultaneously feeding to said bed ammonia or a compound capable of liberating ammonia at the temperature at which the flue gas contacts said bed so that ammonia contacts said carbonaceous material as said flue gas contacts said carbonaceous material, thereby removing said at least one nitrogen oxide or sulfur oxide from said flue gas.
- 11. A process for removing at least one nitrogen oxide or sulfur from a flue gas comprising contacting the flue gas in the presence of oxygen with a bed of a carbonaceous material selected from the group consisting of activated carbon graphite, carbonized char and amorphous carbon, said carbonaceous material being impregnated with bromine, iodine, chlorine, an ammonium salt thereof, or a compound capable of liberating chlorine, bromine, iodine or an ammonium salt thereof under the conditions encountered when said flue gas contacts said bed and simultaneously feeding to said bed of carbonaceous material ammonia or a compound capable of liberating ammonia at the temperature at which the flue gas contacts said bed, thereby removing at least one nitrogen oxide or sulfur oxide from said flue gas, said bed containing at least 0.01 gram bromine, iodine or chlorine per kilogram of said carbonaceous material or a corresponding amount of said ammonium salt or said compound capable of yielding chlorine, bromine, iodine or an ammonium salt thereof, said flue gas being contacted with said bed at a temperature such that the ammonium salt of said bromine, iodine or chlorine can be adsorbed by said carbonaceous material.
-
22. A process for removing at least one nitrogen oxide or sulfur oxide from a flue gas comprising:
-
A. passing said flue gas through a bed of carbonaceous material containing ammonium iodide, ammonium bromide or ammonium chloride so that (1) said at least one nitrogen oxide or sulfur oxide is retained in said bed in the form of an ammonium salt and (2) iodine, bromine, or chlorine as a by-product is produced in said bed, and B. feeding simultaneously ammonia to said bed to convert said by-product to an ammonium salt in said bed. - View Dependent Claims (23, 24)
-
- 25. A process for removing at least one nitrogen oxide or sulfur oxide from a flue gas comprising contacting the flue gas in the presence of oxygen with a bed of activated carbon impregnated with bromine, iodine, chlorine, an ammonium salt thereof, or a compound capable of liberating bromine, iodine, chlorine, or an ammonium salt thereof under the conditions encountered when said flue gas contacts said bed, and simultaneously feeding to said bed ammonia or a compound capable of liberating ammonia at the temperature at which the flue gas contacts said bed, thereby removing at least one nitrogen oxide or sulfur oxide from said flue gas, said bed containing at least 0.01 gram bromine, iodine or chlorine per kilogram of said activated carbon or a corresponding amount of said ammonium salt or said compound capable of yielding chlorine, bromine, iodine or an ammonium salt thereof.
Specification