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| Number | Title | Issue Date |
| 7117046 | Cascaded control of an average value of a process parameter to a desired value At least one of the multiple process parameters (MPPs) is a controllable process parameter (CTPP) and one is a targeted process parameter (TPP). The process also has a defined target limit (DTV) representing a first limit on an actual average value (AAV) of the TPP.... | 10/03/2006 |
| 7097739 | Method for the production of improved pulp Compositions and method for improving properties of pulp produced or reducing the digester cycle time in alkaline chemical pulping processes in which an effective amount of at least one selected phosphonate or carboxylate compound or mixtures thereof is admixed with... | 08/29/2006 |
| 7000382 | Partial oxidation of alcohols A method of partially oxidizing an alcohol to an aldehyde or ketone comprises contacting a gas containing the alcohol with a solid catalyst containing molybdenum, preferably in a +6 oxidation state, and having a surface area of 10 m2/g or higher, preferab... | 02/21/2006 |
| 6663841 | Removal of H2S and/or mercaptans form supercritical and/or liquid CO2 A method for removing or scavenging hydrogen sulfide (H2 S) and/or mercaptans from supercritical and/or liquid carbon dioxide (CO2) using triazine scavenging agents is described. Preferred triazines are hexahydrotriazines.... | 12/16/2003 |
| 6652821 | Purificating agent for flue gas and incinerated ash and purificating method using the same The present invention provides a purifying agent having an effect of removing or decomposing toxic substances contained in flue gas or incinerated ash. The purifying agent of the present invention contains one or more kinds of salts selected from alkali m... | 11/25/2003 |
| 6126911 | Metal oxide product suitable for use in dehydrated gas The present invention relates to the use of metal oxide particles held on carrier particles and moistened with a hygroscopic moistening agent, preferably glycol, with the moistened metal oxide particles used in a system designed to remove sulfur from dehy... | 10/03/2000 |
| 5705090 | Absorption of mercaptans Absorption solvents for removing mercaptans from gas streams are disclosed. The absorption solvents comprise an alkylether of a polyalkylene glycol, e.g., methoxytriglycol, and a secondary monoalkanolamine, e.g., N-methylethanolamine, as well as optionall... | 01/06/1998 |
| 5670122 | Methods for removing air pollutants from combustion flue gas A method is provided for preventing the release of air pollutants with combustion flue gases emitted to the atmosphere by the removal of one or more of nitric oxide, sulfur trioxide, light hydrocarbons, carbon monoxide, and trace amounts of mercury from c... | 09/23/1997 |
| 5589149 | Process for absorption of mercaptans Absorption solvents for removing mercaptans from gas streams are disclosed. The absorption solvents comprise an alkylether of a polyalkylene glycol, e.g., methoxytriglycol, and a secondary monoalkanolamine, e.g., N-methylethanolamine, as well as optionall... | 12/31/1996 |
| 5392594 | Integrated production of fuel gas and oxygenated organic compounds from synthesis gas An oxygenated organic liquid product and a fuel gas are produced from a portion of synthesis gas comprising hydrogen, carbon monoxide, carbon dioxide, and sulfur-containing compounds in a integrated feed treatment and catalytic reaction system. To prevent... | 02/28/1995 |
| 5277837 | Method and composition for treating flue or exhaust gases utilizing modified calcium hydroxide A process is shown for treating flue or exhaust gases in order to remove sulfur oxides and hydrochloric acids in which calcium hydroxide having a surface area of at least 25 m2 /g and a moisture content lower than 50% is injected in the gases t... | 01/11/1994 |
| 5173279 | Method and composition for treating flue or exhaust gases utilizing modified calcium hydroxide A process is shown for treating flue or exhaust gases in order to remove sulfur oxides and hydrochloric acids in which calcium hydroxide having a surface area of at least 25 m2 /g and a moisture content lower than 50% is injected in the gases t... | 12/22/1992 |
| 5077023 | Reduction in the rate of oxidation of sulfite solutions The rates of oxidation of sulfite/bisulfite-containing solutions in gas-liquid scrubbers for removing SO2 from gases are reduced by adding oxidation inhibitors to the solutions in an amount of from 0.02 to 20 mmol per hour and per square meter ... | 12/31/1991 |
| 5057293 | Multi-stage process for reducing the concentration of pollutants in an effluent A process is presented for reducing the concentration of pollutants in an effluent from the combustion of a carbonaceous fuel. The process comprises introducing a first treatment agent into the effluent at a first temperature zone to reduce the concentrat... | 10/15/1991 |
| 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 |
| 4885146 | Process for scrubbing of NO and/or SO2 from gas mixtures A process is described for scrubbing of NOx and/or SO2 from waste gases as, e.g., flue gases, which employs a scrubbing agent comprising Fe(II) ions in nonaqueous solvents. The scrubbing agent can be regenerated after its loading sim... | 12/05/1989 |
| 4849192 | Methods for preventing formation of sulfuric acid and related products in combustion effluents The present invention is related to a method for preventing the formation of NH4 HSO4 during the noncatalytic reduction of nitric oxide by ammonia or ammonia precursors in combustion effluents. The present invention is also related t... | 07/18/1989 |
| 4822577 | Method for the reduction of sulfur trioxide in an effluent A method is presented for the selective gas-phase reduction of sulfur trioxide in the effluent from the combustion of a carbonaceous fuel, the method comprising introducing a treatment agent comprising hydrogen peroxide or an oxygenated hydrocarbon having... | 04/18/1989 |
| 4795620 | Claus residual gas cleanup using tetraethylene glycol dimethyl ethers as SO2 scrubbing agent A process is disclosed for the purification of a gaseous stream contaminated at least with CO2 and H2 S. The gaseous stream is preheated and subjected, in the presence of recycled SO2, to a catalytic conversion of H2 | 01/03/1989 |
| 4735787 | Scale inhibitor for intermittent washed mist eliminators in flue gas desulfurization systems A method of preventing scale and deposit formation on the surfaces of mist eliminators in wet scrubber flue gas desulfurization systems which utilize intermittent wash cycles which comprises coating the surfaces of these mist eliminators with a thin coati... | 04/05/1988 |
| 4664903 | Removal of sulfur compounds from gases For the removal of sulfur compounds, especially H2 S, from gases that contain hydrocarbons, and/or CO2, the gases are scrubbed with a physical solvent, which is to be regenerated and reused. To obtain sulfur free of hydrocarbons, as ... | 05/12/1987 |
| 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 |
| 4423018 | Buffered flue gas scrubbing system using adipic acid by-product stream A by-product stream from the production of adipic acid from cyclohexane, containing glutaric acid, succinic acid and adipic acid, is employed as a buffer in lime or limestone flue gas scrubbing for the removal of sulfur dioxide from combustion gases.... | 12/27/1983 |
| 4418044 | Nitric oxide and sulfur oxide absorption by scrubbing with Fe++ /S.sub. O3- A method of scrubbing a gaseous mixture comprising NO and SO2 said method comprising providing a scrubbing solution, said scrubbing solution comprising a solvent and a solute wherein said solute comprises Fe++ and S2 O | 11/29/1983 |
| 4313916 | Process for the purification of non-reacting gases A process is disclosed for the purification of an inert or non-reacting gas such as lower mono-olefins by the removal of trace amounts of reacting impurities such as carbon dioxide therefrom, comprising passing said gas through an essentially non-aqueous ... | 02/02/1982 |
| 4255400 | Process for oxidizing oxides of sulfur This invention relates to a process for catalytic oxidation of oxides of sulfur and also relates to oxidation of oxides of sulfur oxides and oxides of nitrogen.... | 03/10/1981 |
| 4203953 | Process for removing SO2 from waste gases A buffer solution containing glycerol is used for removing sulfur dioxide from waste gases. Sulfur is recovered from the glycerol-buffer solution having sulfur dioxide absorbed therein, by reaction with hydrogen sulfide.... | 05/20/1980 |
| 4170628 | Process for removing SO2 from effluent gases and for removing heat stable salts from systems in which they accumulate using an anion exchange resin Improvement in processes for the selective removal of sulfur dioxide with respect to carbon dioxide from a gas mixture containing same wherein the gas mixture is contacted with an aqueous absorbent solution, such as alkanolamine, alkali metal hydroxide, a... | 10/09/1979 |
| 4152400 | Method for treating sulfur dioxide with sorbent Process for preparing shaped base materials for use in solid catalysts for commercial processes. The solid contact material is prepared by pre-soaking a porous solid particulate carrier material in an organic liquid, immersing the carrier without drying i... | 05/01/1979 |
| 3932589 | Selective chromatographic separation of sulfur dioxide with organic reagents This invention comprises a method for the separation of one component or more from a vapor or gas mixture which involves the step of reacting the component to form a complex or thermally decomposible molecule by reaction with a compound adsorbed or otherw... | 01/13/1976 |
