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| Number | Title | Issue Date |
| 7419646 | Method of deacidizing a gas with a fractional regeneration absorbent solution The gaseous effluent flowing in through line 1 is contacted in absorption zone ZA with the liquid absorbent solution flowing in through line 9. The gaseous effluent depleted in acid compounds is discharged through line 2. The absorbent solution ... | 09/02/2008 |
| 7341701 | Method, apparatus and plant for treating culinary gaseous effluents A method and apparatus (22) for treating culinary gaseous effluents (Eg) carried in an air extraction duct of a kitchen, the apparatus includes: a unit (24) for storing in liquid form a nucleophilic active product (Pa... | 03/11/2008 |
| 7037474 | Use of sulfide-containing liquors for removing mercury from flue gases A method and apparatus for reducing and removing mercury in industrial gases, such as a flue gas, produced by the combustion of fossil fuels, such as coal, adds sulfide ions to the flue gas as it passes through a scrubber. Ideally, the source of these sulfide ions m... | 05/02/2006 |
| 6960332 | Process for purifying aqueous buffer solutions The present invention describes a procedure for the removal of sodium sulphate from a phosphate solution that has been used for absorption of SO2 from flue gases, in which a precipitate forms when the absorption solution is regenerated by evaporation. In ... | 11/01/2005 |
| 6277344 | Simultaneous use of peroxygen and olefin compound in odor reduction Disclosed is a process for the treatment of a plant fluid effluent containing odor compounds including an alkyl mercaptan or an alkyl thiol, an amine compound, ammonia, hydrogen sulfide and mixtures thereof by contacting the plant effluent in either a cou... | 08/21/2001 |
| 5785841 | Method of removing sulfur dioxide and nitrogen oxides from a gaseous stream A method for removing sulfur dioxide and nitrogen oxides from a gaseous stream using a magnesium-enhanced lime scrubbing slurry containing a ferrous chelate where oxidized ferrous chelate is regenerated by electrochemical treatment. The spent scrubbing so... | 07/28/1998 |
| 5733517 | Byproduct solids crystal modification with organic acids in wet flue gas desulfurization systems A wet, calcium-based flue gas desulfurization process conducted under inhibited oxidation conditions and in the presence of at least one organic acid which both enhances the efficiency of sulfur dioxide removal and modifies the crystal habit of calcium su... | 03/31/1998 |
| 5433936 | Flue gas desulfurization process A flue gas desulfurization process which comprises the steps of absorbing and separating sulfur oxides from a combustion waste gas using a Ca compound and, as an absorption auxiliary agent, an organic acid which has carboxyl groups at opposite ends of a s... | 07/18/1995 |
| 5342592 | Lance-type injection apparatus for introducing chemical agents into flue gases The removal of sulfur oxides (SOx) and nitrogen oxides (NOx) from combustion effluents is enhanced by the supplying of reactants in a particular distribution pattern in the gas flow. To achieve the particular distribution pattern and... | 08/30/1994 |
| 5246677 | Addition of organophosphonates for size control of wet calcium-based FGD byproduct solids under forced oxidation conditions A process for producing large, regularly-shaped crystalline gypsum solids in a wet calcium-based flue gas desulfurization system is provided. A chemical crystal modifier, preferably an organophosphonate, is added to the gypsum-containing solids slurry pro... | 09/21/1993 |
| 5246471 | Method and apparatus for gas liquid contact A gas-liquid contact system for absorption of gaseous contaminants in an absorptive liquid where contact is attained by a controlled flow relationship between the gas and the liquid forming a fluidized liquid mass for intimate contact between the two.... | 09/21/1993 |
| 5034204 | Flue gas desulfurization process A wet, calcium-based, flue gas desulfurization process for reliably and cost effectively removing sulfur dioxide from the flue gas generated by the combustion of fossil flues containing sulfur includes the step of contacting the combustion flue gas prefer... | 07/23/1991 |
| 5023063 | Acid rain abatement The process of this invention will remove from acid rain essentially all of both the sulfur oxides (SOX) and nitrogen oxides (NOX) by catalytically reducing the NOX to water and elemental nitrogen and the SOX to either H2 S or elemental sulfur ... | 06/11/1991 |
| 4994246 | Method for removing sulfur oxides from combusting gases in wet, calcium-based flue gas desulfurization processes A method is provided for improving the reliability, SO2 removal and thiosulfate utilization in a wet lime/limestone flue gas desulfurization process by contacting the combustion gases in the presence of the wet lime or limestone with thiosulfat... | 02/19/1991 |
| 4968501 | Use of chlorous acid for removing sulfur dioxide from combustion gases The present invention describes a novel method of using chlorous acid to remove sulfur dioxide from exhaust combustion gases.... | 11/06/1990 |
| 4919904 | Primary hindered aminoacids for promoted acid gas scrubbing process Disclosed are primary sterically hindered aminoacids for use as promoters for alkali metal salts in acid gas scrubbing. The primary sterically hindered aminoacid is selected from 1-amino-cyclopentane carboxylic acid and those represented by the formula: ... | 04/24/1990 |
| 4892718 | Decontamination of gases by scrubbing COS, CS2, mercaptan, SH2, SOX and/or NOX are removed from a host gas by scrubbing using a solution of a salt of Scandium, Yttrium, an element of the Lanthanide or Actinium groups or blends thereof in water or in organic solvent.... | 01/09/1990 |
| 4891195 | Synergistic effect of oil-soluble surfactants and dibasic carboxylic acids on SO2 removal enhancement in flue gas desulfurization process A method of improving the SO2 scrubbing efficiency of flue gas desulfurization scrubbers which comprises treating the scrubbers during the scrubbing operations with a dibasic carboxylic acid and an oil-soluble surfactant combined in a weight ra... | 01/02/1990 |
| 4758416 | Removal of H2 S from gas streams A process for the removal of H2 S from sour gaseous streams is disclosed in which the sour gaseous stream is contacted with a solution containing solubilized iron chelates of nitrilotriacetic acid. The contacting is carried out in first and sec... | 07/19/1988 |
| 4741888 | H2 S removal from gas streams A process for the removal of H2 S from sour gaseous streams is disclosed in which the sour gaseous stream is contacted with a solution containing solubilized iron chelates of a specified organic acid or acids. The contacting is carried out in f... | 05/03/1988 |
| 4670234 | Process for stripping nitrogen oxides and sulphur oxides as well as optionally other noxious elements of flue gas from combustion plants Process for stripping nitrogen oxides and sulphur oxides, as well as optionally other noxious elements from flue gas from combustion plants, preferably boilers of electric plants supplied with fossil fuels, the nitrogen oxides being reduced into elemental... | 06/02/1987 |
| 4670238 | Recycled sorbent flue gas desulfurization An improved process for reducing the sulfur content of a flue gas derived from combination of a sulfur-containing fuel by inserting a dry sulfur sorbent material into the flue gas, then humidifying the sorbent-containing flue gas to enhance sulfur removal... | 06/02/1987 |
| 4659553 | Process for removal of undesirable gaseous components from hot flue gases The invention refers to a process for the removal of undesirable gaseous components from hot flue gases incurred in the combustion of carbonaceous fuels. The flue gas is passed through regenerators for cooling and preliminary cleaning, and subsequently is... | 04/21/1987 |
| 4600568 | Flue gas desulfurization process Flue gas is desulfurized by mixing into it at a temperature between about 120° and about 230° C. a finely divided sorbent such as calcium hydroxide and, immediately downstream of the mixing point, spraying the gaseous suspension with an aqueous solution... | 07/15/1986 |
| 4578257 | Process for removing sulfur dioxide from off-gas Disclosed is an improvement in a process for desulfurization of off-gas, which process comprises contacting an off-gas which contains sulfur dioxide with an absorbing solution containing at least a sulfosuccinate, a sulfate and a crystalline gypsum to abs... | 03/25/1986 |
| 4559212 | Process for purifying gases containing sulphur dioxide Process for removal of sulphur dioxide from exhaust gases by absorption in an aqueous solution containing ions of adipic acid, and stripping of sulphur dioxide with steam. Solid adipic acid is added to the absorption solution before or during the steam st... | 12/17/1985 |
| 4554140 | Off-gas desulfurization process In the conversion of sulfur dioxide in an off-gas to gypsum for removal by oxidizing with an oxygen-containing gas while neutralizing with limestone an absorbed solution formed by contacting an off-gas containing sulfur dioxide with an absorbing solution ... | 11/19/1985 |
| 4533532 | Carboxylic acid activated dry calcium absorbent method for removing sulfur dioxide from a flue gas An absorbent for the dry removal of sulfur dioxide and other noxious and toxic components from a combustion flue gas which consists essentially of at least one finely divided alkaline-earth compound and an additive selected from the group which consists o... | 08/06/1985 |
| 4387037 | Removal of sulfur from waste gas streams Preferential sulfur dioxide absorption solvents may be buffered with suitable agents, such as alkanolaminium carboxylates, to substantially retard or eliminate the tendency of such solvents to degrade or accumulate non-regenerable salts, particularly sulf... | 06/07/1983 |
| 4348289 | Water treatment method to remove dissolved oxygen therefrom This specification discloses a method of treating water which contains oxygen dissolved therein to scavenge the oxygen therefrom and reduce the corrosiveness of the water. A sulfur-containing fuel is burned in a flue gas generator to generate a flue gas c... | 09/07/1982 |
| 4347227 | Process for removing SOx and NOx compounds from gas streams A gas stream containing SOx and NOx compounds is first treated for SOx removal by absorbing the SOx components in an aqueous liquid absorbent comprising formic or oxalic acid and an alkanolamine containing a ter... | 08/31/1982 |
| 4337231 | Removal of sulfur dioxide from exhaust gas A method of removing sulfur dioxide from an exhaust gas with use of an absorbent containing a salt of an organic acid within a scrubber provided with perforated plates, characterized in that the vapor of organic acid discharged from the top of the perfora... | 06/29/1982 |
| 4331639 | Process for removing SOx and NOx compounds from gas streams Gas streams containing SOx and/or NOx compounds are treated in an absorption-regeneration process for removal of the SOx and/or NOx compounds. The process in one embodiment removes SOx compounds from ... | 05/25/1982 |
| 4330478 | Method of oxidizing a polyvalent metal Process of carrying out oxidation-reduction reactions such as oxidation of hydrogen sulfide to sulfur, in which a polyvalent metal chelate with a certain class of polycarboxylic acid is employed, the metal being reduced from a higher valence state to a lo... | 05/18/1982 |
| 4320101 | Removal of sulfur from waste gas streams Preferential sulfur dioxide absorption solvents may be buffered with suitable agents, such as alkanolaminium carboxylates, to substantially retard or eliminate the tendency of such solvents to degrade or accumulate non-regenerable salts, particularly sulf... | 03/16/1982 |
| 4310691 | Method for selectively recovering sodium citrate from an aqueous solution A process for recovering sodium citrate from a solution utilized in an absorption/stripping process for SO2 recovery, which involves cooling a portion of the stripping solution to precipitate sodium sulfate, which is separated from the mother l... | 01/12/1982 |
| 4277451 | Wet process for the desulfurization of exhaust gas A wet process for the desulfurization of exhaust gas comprising the following operation steps so as to eliminate and recover sulfur dioxide from exhaust gas containing it: (A) a step of absorbing sulfur dioxide by contacting exhaust gas with an absorbent ... | 07/07/1981 |
| 4222993 | Removal of noxious contaminants from gas Gas contaminated with at least one noxious component, such as SO2, HF or NOx, is scrubbed with a clear, calcium-containing, initially-basic washing liquid which also comprises the anion of a strong inorganic acid, that of a polybasic... | 09/16/1980 |
| 4203954 | Process for desulfurization of exhaust gases recovering gypsum as _by-product This invention relates to a process for desulfurization of exhaust gases wherein the sulfur oxides are efficiently removed in the stabilized form from exhaust gases containing said sulfur oxides and at the same time gypsum of good quality is recovered. Mo... | 05/20/1980 |
| 4140751 | Process for pressure stripping of sulfur dioxide from buffered solutions A process for steam stripping sulfur dioxide from a buffered aqueous solution in which it is absorbed in a flue gas desulfurization process is carried out at pressure greater than atmospheric. The process of pressure stripping of sulfur dioxide surprising... | 02/20/1979 |
