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| Number | Title | Issue Date |
| 7252813 | Process for condensation of sulphuric acid vapours to produce sulphuric acid A process for production of sulphuric acid comprising condensing sulphuric acid vapour from a gas mixture containing 0.01 to 10 vol. % of H2SO4 vapour calculated at complete hydration of SO3 in the gas to H2SO4 ... | 08/07/2007 |
| 7223375 | Emission control systems and methods thereof A method and system for controlling one or more emissions includes introducing ammonia to react with at least a portion of sulfur trioxides in an exhaust emission and result in at least one or more ammoniated compounds. At least a portion of fly ash particles and th... | 05/29/2007 |
| 7214358 | Low energy regenerable SOscrubbing process Sulphur dioxide is removed from gas streams by contacting the gas stream with an absorbing medium containing an amine capable of forming an amine salt, heat stable salt and sulfite. The level of heat stable salt is selected such that during the regeneration process ... | 05/08/2007 |
| 6939523 | Method of removing SO3 from flue gases A calcium hydroxide slurry is injected into the off gases in the exhaust duct of an industrial plant which burns sulfur containing fuels. The calcium hydroxide slurry reacts with SO3 produced as a result of the combustion process and forms a primary solid... | 09/06/2005 |
| 6428760 | Method for desulfurizing exhaust gas The present invention relates to the improvement of a replenishment method of a magnesium-based compound and to the improvement of a double decomposition method, which can be used in a magnesium hydroxide desulfurization method. In the improved replenishm... | 08/06/2002 |
| 5958335 | Method and apparatus for preventing corrosion of exhaust gas treatment systems A corrosion preventive method and an apparatus for preventing corrosion of stainless steel components in an exhaust gas desulfurizing apparatus of an exhaust gas treatment system comprising the exhaust gas desulfurizing apparatus for removing at least sul... | 09/28/1999 |
| 5609841 | Method and apparatus for treating a flow of gas containing oxidized sulphur compounds A method of treating a flow of gas containing oxidized sulphur compounds, such as an exhaust gas from coal combustion, comprising the steps of (i) treating the flow of gas to obtain a first component flow containing at least 30% of the total oxidized sulp... | 03/11/1997 |
| 5486342 | Clear liquor scrubbing of sulfur dioxide with forced oxidation in flue gas desulfurization system A flue gas desulfurization process and system employing a clear scrubbing liquor and an organic acid buffer conducted under forced oxidation conditions to produce a usable gypsum by-product without scrubber scaling and abrasion is provided. Calcium ion co... | 01/23/1996 |
| 5122352 | Heat exchanger and pollutant removal system A system for cooling flue gases from a fossil fuel boiler plant, and removing pollutants from the flue gas, is disclosed. In a first section of the apparatus, heat exchange cools the flue gas to just above the condensation point of water, and condensed H | 06/16/1992 |
| 5075085 | Desulfurizing method for exhaust gas from combustor A method and equipment for desulfurizing exhaust gas from a combustor in which the exhaust gas containing SO2 from the combustor is brought into contact with SO2 absorbent to remove SO2 and is blown down out of the system;... | 12/24/1991 |
| 5061467 | Economic recovery and utilization of boiler flue gas pollutants Improved methods and apparatus for removing unwanted pollutants from flue gases are disclosed. A sequence of at least three vertical beds of particulates is disposed in the flue gas exhaust duct. A first bed comprises boiler ash or sand. Lime in the fly a... | 10/29/1991 |
| 5028310 | Reduction of SOx in regenerator off gas of a fluid cracking unit SOx in regenerator off gas in a fluid cracking unit is decreased by providing in the regenerator bed, a metal grid bearing a layer of rare earth oxide.... | 07/02/1991 |
| 5023064 | Method for removing sulfur oxide Gas reacting apparatus and method are described for wet mass transfer of solute gases from a gas stream with a liquid or slurry reacting medium capable of chemisorption of solute gases in the gas stream. The apparatus comprises an elongated conduit means ... | 06/11/1991 |
| 5007999 | Method for reducing sulfur oxide emission during an FCC operation A process for reducing sulfur oxides production during an FCC cracking operation comprises the steps of: (a) passivating metal contaminants on an FCC catalyst by contacting the FCC catalyst with a sulfur-containing compound under conditions that enable as... | 04/16/1991 |
| 4986966 | Retrofit flue gas scrubber system A scrubber module (16) of the wet type includes a partition (26) extending across the upper end of a tank (20) between the dirty flue gas inlet (28) and the clean flue gas outlet (30). The partition (26) takes the form of a plurality of hollow fingers (32... | 01/22/1991 |
| 4943422 | Process for treatment of gaseous effluents containing sulfur dioxide with oxygen A method and apparatus are provided for treating gaseous effluents containing sulfur dioxide. Sulfur dioxide is oxidized by oxygen in a concentrated sulfuric acid medium in the presence of a catalyst comprising electrooxidized salts of Mn+2. The gaseous e... | 07/24/1990 |
| 4931263 | Wet-process stack gas purification method A wet-process stack gas purification method and apparatus wherein stack gas is scrubbed by bubbling it into a first scrubbing liquid while maintaining the level of the first scrubbing liquid. The above scrubbed gas is subjected to a counter-current contac... | 06/05/1990 |
| 4917875 | Gas/solid contact method for removing sulfur oxides from gases An improved continuous cyclic process for removing oxides of sulfur from a waste gas with a regenerable particulate adsorbent in which hot adsorbent particles pick up SOx in a first fluid transport riser, followed by separation of clean gas from sulfur-co... | 04/17/1990 |
| 4911901 | Wet desulfurization process for treating a flue gas A process for treating a flue gas containing sulfur dioxide and fly ash is disclosed in which an aqueous absorbent liquid is sprayed into the glue gas stream, and the resulting gas is fed to a vertical, open-ended pipe to form a jet annular stream, so tha... | 03/27/1990 |
| 4874591 | Process for the purification of waste gases containing hydrochloric acid and sulphur dioxide In a process for the purification of waste gases containing hydrochloric acid and sulphur dioxide obtained from incinerating plant, in particular refuse incinerating plant, hydrochloric acid and gypsum are to be recovered. For that purpose a magnesium hyd... | 10/17/1989 |
| 4861577 | Method for removing the sulphur content of a weak gas containing sulfur dioxide The invention relates to a method for cleaning exhaust gases weak in sulphur dioxide, or sulphur dioxide and hydrogen sulphide. In order to remove the sulphur content of an exhaust gas, the exhaust gas is absorbed into a solution containing sulphide. Ther... | 08/29/1989 |
| 4832936 | Process for making calcium sulfate dihydrate or gypsum A process is described for making flue gas gypsum from desulfurization of power plant exhaust gas. The process comprises treating the flue gas in a wash tower with a wash water suspension containing calcium oxide, calcium hydroxide or calcium carbonate an... | 05/23/1989 |
| 4831207 | Chemical processing with an operational step sensitive to a feedstream component The present invention relates to a chemical process involving a processing step which is sensitive to the presence of at least one component contained within the stream to be processed and to an economical and efficient method of temporarily removing such... | 05/16/1989 |
| 4666694 | Method for treating by-products from flue gas A dry particulate sulfite-containing material produced in a flue gas desulfurization process is oxidized and agglomerated in a fluidized bed reactor, wherein the material is fluidized in an oxygen-containing gas. The oxygen-containing gas which is supplie... | 05/19/1987 |
| 4552735 | Process for removing total reduced sulfur compounds from industrial gases using manganese dioxide A process and apparatus for removing total reduced sulfur compounds (TRS), especially H2 S and mercaptans from industrial gases is disclosed wherein an aqueous suspension of an active manganese dioxide is contacted with the industrial gas by at... | 11/12/1985 |
| 4446010 | Fluid catalytic cracking A fluid catalytic cracking process for sulfur-containing petroleum charge stocks wherein sulfur contained in coke deposited on the fluidized cracking catalyst in the reactor is converted to sulfur oxides in the regenerator and removed from regenerator off... | 05/01/1984 |
| 4396594 | Sulfur dioxide reduction process Sulfur dioxide is converted to elemental surfur by reduction with a carbonaceous material in a reaction zone containing a molten salt. Heat is provided by reacting a portion of the carbonaceous material with oxygen. In a preferred embodiment alkali metal ... | 08/02/1983 |
| 4385039 | Process for removal of sulfur oxides from waste gases A process for removing sulfur oxides from waste gas is provided. The gas is contacted with a sorbent selected from sodium bicarbonate, trona and activated sodium carbonate and, utilizing an alkaline liquor containing borate ion so as to reduce flow rates ... | 05/24/1983 |
| 4374812 | Process for stack gas treatment A wet process for stack gas treatment wherein the stack gas is scrubbed with a suspension containing calcium hydroxide and/or calcium carbonate to remove sulfur oxides from the gas, characterized in that (1) air or oxygen-containing gas is supplied to the gas ... | 02/22/1983 |
| 4369108 | Process for removing sulfur oxides from a gas Sulfur oxides are removed from a gas by an absorbent which comprises alumina in association with free or combined lanthanum, wherein the ratio by weight of alumina to lanthanum is from about 0.1 to about 30,000. Absorbed sulfur oxides are recovered as a s... | 01/18/1983 |
| 4325811 | Catalytic cracking with reduced emission of noxious gas A process for the control of sulfur oxide emissions from the regenerator of a fluid catalytic cracking unit which involves circulating solid particles through the process cycle which comprise cracking catalyst and a regenerable sulfur oxide absorbent, abs... | 04/20/1982 |
| 4300997 | Catalytic cracking with reduced emission of noxious gas Small amounts of a promoter comprising palladium and ruthenium enhance the combustion of carbon monoxide within the regeneration zone of a catalytic cracking unit without simultaneously causing the formation of excessive amounts of nitrogen oxides. The pa... | 11/17/1981 |
| 4285806 | Catalyst and process for conversion of hydrocarbons An improved process for converting hydrocarbons using a catalyst which is periodically regenerated to remove carbonaceous deposits, the catalyst being comprised of a mixture containing, as a major component, solid particles capable of promoting hydrocarbo... | 08/25/1981 |
| 4284608 | Process for regenerating sulfur dioxide gas scrubbing solutions It is known to remove sulfur dioxide from gas streams, particularly waste or flue gases, by contact with aqueous scrubbing solutions containing a metal salt, such as ferric sulfate, in which the valence of the metal is reduced by the sulfur dioxide. It is... | 08/18/1981 |
| 4283374 | Regenerable manganese oxide hot gas desulfurization process A continuous regenerative process for desulfurizing a hot reducing gas is disclosed. The gas is scrubbed by a sorbent containing MnO and Mn3 O4. The spent sorbent is regenerated by reacting the MnS with an excess of Mn3 O | 08/11/1981 |
| 4274942 | Control of emissions in FCC regenerator flue gas Process and system are described for control of sulfur oxide in emissions to the atmosphere from regenerators of Fluid Catalytic Cracking Units (FCC) in a manner which improves the operation of the regenerator and/or the reactor. Spent FCC cracking cataly... | 06/23/1981 |
| 4248842 | Removal of contaminants and recovery of by-products from hot waste gas stream A process for the removal of sulfur dioxide and other contaminants and the recovery of ammonium sulfate as a by-product from a hot waste gas stream comprising cooling the waste gas stream to a temperature below 120° F., passing said waste gas stream in s... | 02/03/1981 |
| 4235853 | Method for sulfur dioxide control II A method and apparatus for removing sulfur dioxide from a gas stream such as a stack gas stream utilizing an aqueous slurry of manganous hydroxide as an absorbant and utilizing a regeneration of manganous hydroxide from manganous sulfate thereby produced.... | 11/25/1980 |
| 4201753 | Flue gas desulfurization process A method of desulfurizing carbonaceous fuel, such as coal and oil containing sulfur. The fuel is ignited in a boiler combustion zone and a saturated solution of potassium carbonate and potassium hydroxide is sprayed into the flue gas stream immediately do... | 05/06/1980 |
| 4081522 | Regeneration of sulfated metal oxides and carbonates Alkali metal or alkaline earth metal carbonates such as calcium carbonate and magnesium carbonate found in dolomite or limestone are employed for removal of sulfur dioxide from combustion exhaust gases. The sulfated carbonates are regenerated to oxides th... | 03/28/1978 |
