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| Number | Title | Issue Date |
| 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 |
| 7326392 | HS scavenging method A method for removing H2S from H2S-containing gaseous streams in which an H2S-containing gaseous stream is introduced into a flow channel and at least one liquid chemical H2S scavenging agent is also introduced into the fl... | 02/05/2008 |
| 7264747 | Coated microbubbles for treating an aquifer or soil formations A microporous diffuser includes a first elongated member including at least one sidewall having a plurality of microscopic openings. The sidewall defines an interior hollow portion of the member. The diffuser has a second elongated member having a second sidewall ha... | 09/04/2007 |
| 7192565 | Method of collecting mercaptans contained in a gaseous feed The gaseous feed flowing in through line 1 is contacted in contacting zone ZA with a liquid solvent flowing in through line 2. The solvent comprises between 0.001% and 100% by weight of a liquid olefin. Contacting in zone ZA is carried out in the prese... | 03/20/2007 |
| 7122167 | Precious metal recovery from organics-precious metal compositions with supercritical water reactant A supercritical oxidation process carried out in water is capable of oxidizing “organics” in precious metal organic compositions such as heterogeneous (Pt/C) or homogeneous precious metal catalysts and producing a precious metal oxide with few by-products and lo... | 10/17/2006 |
| 7112309 | Method and apparatus for use of reacted hydrogen peroxide compounds in industrial process waters Methods and apparatus are described which utilize an aqueous hydrogen peroxide composition of hydrogen peroxide and at least one additive which serves to catalyze the rapid decomposition of the hydrogen peroxide into hydroxyl radicals. When contacted with an atmosph... | 09/26/2006 |
| 7105039 | Ozone remediation apparatus and methods A method and apparatus is provided of adding ozone and ozone and oxygen and ozone and another oxidizer such as chlorine dioxide or an acidifying agent to contaminated environments including high pressure work sites such as wells and sewage pipes and into high temper... | 09/12/2006 |
| 7022296 | Method for treating flue gas A multiple-field precipitator, flue-gas treating device, in accordance with the principles of the invention, includes a first section having a dual-function, sensible-cooling heat exchanger/electrostatic precipitator, a second section having a wet electrostatic prec... | 04/04/2006 |
| 7022297 | Method and system for purifying or cleansing a gas stream or gaseous body A method and system for eliminating, in whole or in part, contaminants in a gas stream or gaseous body such as air or an exhaust gas or gas emission stream is provided. The method includes the steps of contacting the gas stream or gaseous body with a biocide contain... | 04/04/2006 |
| 6998098 | Removal of gases from a feed A process is presented for separating and removing acid gases or base gases from a feed gas by use of a gas permeable membrane and a permeate comprising a treatment solution. The treatment solution in the permeate is caustic or acidic and reacts with the base or aci... | 02/14/2006 |
| 6953557 | Process and apparatus for treating semiconductor production exhaust gases A process and an apparatus for treating exhaust gases, comprising an aeration stirring tank (5) employing an aqueous alkaline liquid, and, as a posterior stage, a gas-liquid contact device (7) and/or a packed column (11). The apparatus can remov... | 10/11/2005 |
| 6645450 | Method and apparatus for use of reacted hydrogen peroxide compounds in industrial process waters Methods and apparatus are described which utilize an aqueous hydrogen peroxide composition of hydrogen peroxide and at least one additive which serves to catalyze the rapid decomposition of the hydrogen peroxide into hydroxyl radicals. When contacted with... | 11/11/2003 |
| 6638488 | Method and apparatus for removing organic hazardous substances using selected solvents Method and apparatus for isolating, decomposing, and fixing the organic hazardous substances in a stable manner using chemical techniques and isolating and decomposing the organic hazardous substances from various waste mixtures. The temperature treatment... | 10/28/2003 |
| 6503471 | Process for malodorous gas treatment Malodorous gases such as amines, organosulfur compounds, hydrogen sulfide, styrene and aldehydes are economically and efficiently treated at ambient temperature and pressure by a catalytic absorption and oxidation process comprising: (a) bringing the malo... | 01/07/2003 |
| 6491888 | pH control method of reducing nitrogen oxides emission The invention relates to a process for the selective recovery of olefins from a mixture of gases by: a) bringing a gaseous mixture having olefins and hydrogen into contact with silver nitrate solution whereby the olefins are absorbed into the silver nitra... | 12/10/2002 |
| 6471928 | Aqueous formaldehyde solutions with a low tetroxane content The claimed invention relates to a process for preparing an aqueous formaldehyde solution comprising absorbing a formaldehyde-loaded gas stream, in an absorption zone, in an aqueous solution comprising from 0.000% to 0.01% by weight of a Bronsted base, ba... | 10/29/2002 |
| 6375912 | Electrochemical abatement of perfluorinated compounds The invention provides an improved point-of-use PFC/HFC abatement process involving an electrochemical route to abatement. PFCs/HFCs are treated with a relatively strong chemical reducing agent, typically an alkali such as lithium, potassium, or sodium, i... | 04/23/2002 |
| 6290923 | Stack emission control system for removing organic pollutants from air A stack emission control system utilized to remove organic contaminants as water-soluble solids from air collected from the vicinity of a polyurethane foam line assembly prior to the exhaust of the air into the surrounding atmosphere is described. A conve... | 09/18/2001 |
| 6280696 | Method and apparatus for removing high boiling point volatile organic compounds from an exhaust A method for removing high boiling point volatile organic compounds from an exhaust gas and an apparatus for performing such operation are described. In the method, a wet scrubber is provided which is equipped with a spent water reservoir at the bottom of... | 08/28/2001 |
| 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 |
| 6207120 | Catalytic vent gas treatment system for abatement of volatile chemical emissions An integrated process for vent gas treatment for the abatement of volatile emissions is disclosed. The vent gas comprises dioxygen, carbon monoxide, hydrocarbons and other organic compounds comprising one or more alkyl halide compound of 1 to 5 carbon ato... | 03/27/2001 |
| 6190635 | Purification of the hydrochloric acid by-product of the synthesis of methanesulphonic acid In order to remove the methanesulphonyl chloride entrained by the gaseous HCl by-product, an amount of water ranging from 0.01 to 20%, relative to the mass of HCl to be treated, is injected into the HCl gas flow and the temperature is lowered to a value b... | 02/20/2001 |
| 6171569 | Method of eliminating malodors from gases Disclosed is a method of eliminating the odor from a malodorous gas, where the odor is due to the presence of a C10 to C18 fatty acid in the gas. An aqueous solution containing at least a stoichiometric amount of a base that reacts w... | 01/09/2001 |
| 6168771 | Supercritical oxidation process and apparatus Substances to be processed and a hydrogen peroxide aqueous solution are enclosed in a process vessel, and a the process vessel is enclosed in an autoclave together with water. Oxidation processing of the substances is performed by changing the state in th... | 01/02/2001 |
| 6106792 | Apparatus and method for cleaning gas A method and apparatus for removing TDI from a gas in which the gas containing the TDI is forced through a scrubber tank. A first water spray is in fluid communication with the gas flowing through an inlet pipe and initially reacts the TDI in the gas with... | 08/22/2000 |
| 6048508 | Process for obtaining carbon monoxide and hydrogen The present invention is directed to a process for simultaneously obtaining pure carbon monoxide and pure hydrogen in a steam reformer plant for hydrogen or ammonia generation, having a primary reformer, a secondary reformer and downstream thereof, a CO c... | 04/11/2000 |
| 6033576 | Chemical waste treatment A method for accelerating the treatment of chemical wastes, particularly recalcitrant wastes such as spent caustic, from the oil, gas, chemical, and petrochemical industries, in which normally slow physical mass transfer of different fluid phases, as well... | 03/07/2000 |
| 6013196 | Process and products for deodorising gaseous cooking effluents The invention concerns a process for deodorizing malodorous gaseous effluents from cooking equipment, particularly in restaurants and in the food industry, by washing with an aqueous solution comprising an alkaline or alkaline-earth salt of a dicarboxylic... | 01/11/2000 |
| 5961695 | Method for treating silane-containing gas A silane-containing gas is treated by contacting it with a liquid containing silanes or disilanes which are higher boiling than the silanes in the silane-containing gas, thereby easily removing or reducing the amount of silanes in the gas and enabling the... | 10/05/1999 |
| 5945078 | Processes for the scrubbing of noxious substances A process for the scrubbing of species of an element of Group 3, 4 and 5(b) of the Periodic Table from a gas stream. The process comprises contacting the gas stream with an aqueous solution of hydrofluoric acid (HF) or a solution containing the hydrogen f... | 08/31/1999 |
| 5741470 | Method and device for removal of ethylene oxide gas A method and a device for the removal of ethylene oxide gas present at high concentrations, for example, 1,000 to 1,000,000 ppm, in exhaust gas is described, which is especially suitable for exhaust gases of gas sterilization chambers. It is suggested to ... | 04/21/1998 |
| 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 |
| 5637442 | Method for treating photolithographic developer and stripper waste streams containing resist or solder mask and gamma butyrolactone or benzyl alcohol A method is disclosed for using the simple, environmentally friendly organic compounds gamma-butyrolactone and benzyl alcohol to develop and to strip free radical-initiated, addition polymerizable resists, cationically cured resists and solder masks and V... | 06/10/1997 |
| 5607654 | Method for minimizing environmental release of toxic compounds in the incineration of wastes A method and apparatus for minimizing the environmental release of acids and toxic organic compounds from a waste incinerator-air pollution control train. The apparatus comprises an incinerator, a gas cooling means such as a waste heat boiler or quench ch... | 03/04/1997 |
| 5567402 | Method of cleaning gases containing organic pollutants A method of cleaning gases includes introducing a gas containing organic pollutants into a scrubber and providing a scrubbing liquid. Finely divided solids capable of remaining substantially in suspension in the scrubbing liquid are introduced into the sc... | 10/22/1996 |
| 5565180 | Method of treating gases 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 ... | 10/15/1996 |
| 5562887 | Purification of alkyl nitrite-containing exhaust gases Alkyl nitrite-containing exhaust gases are purified in continuous form by treating them with equimolar to excess amidosulphuric acid in the form of an aqueous solution in the manner of a counter-current scrubbing at a temperature of 0°-100° C.... | 10/08/1996 |
| 5520896 | Process to remove metal species from exhaust vapors The effluent stream from the treatment of glass with vapor-phase coating materials contains tin residues. By washing that effluent stream, in an apparatus having a scrubber bed and flow-control and -recycling means, with an acidic solution having a limite... | 05/28/1996 |
| 5505920 | Process for treatment of waste gas from a cyclohexane oxidation reactor The present invention relates to a process for the treatment of waste gas discharged from a cyclohexane oxidation reactor used in the manufacture of adipic acid, said waste gas containing mainly nitrogen, oxygen, carbon monoxide, carbon dioxide, acetic ac... | 04/09/1996 |
| 5490977 | Removal of CO, hydrocarbons and NOx with catalyst containing platinum rhodium A catalyst composition suitable for three-way conversion of internal combustion engine, e.g., automobile gasoline engine, exhaust gases includes a catalytic material disposed in on a carrier. The catalytic material contains a co-formed (e.g., co-precipita... | 02/13/1996 |
