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| Number | Title | Issue Date |
| 7419647 | Hydrothermally stable Ag-zeolite traps for small olefin hydrocarbon molecules A hydrocarbon trap comprises an Ag-zeolite which is heated by a unique steaming regimen. ... | 09/02/2008 |
| 7361326 | Process for the production of sulfuric acid A process of producing sulfuric acid from feed gases containing 0.1-30% SO2. The process produces concentrated sulfuric acid from a feed gas containing 0.1 vol % to 30 vol % SO2, in particular a strong feed gas containing 6 vol % to 30 vol % SO... | 04/22/2008 |
| 7052670 | Method for the automated manufacture of pure SO2 from sulfur and oxygen A method for the automated production of liquid SO2 having a purity above 99.9% from elemental sulfur and pure oxygen, in the presence of SO2 recirculated from a closed circuit production system. The temperature of the combustion is controlled ... | 05/30/2006 |
| 7036461 | Waste-heat boiler for a Clause plant The invention relates to a waste-heat boiler (3) for a Claus plant, comprising a steam generation chamber that is surrounded by a pressure-proof jacket (14), a long tube bundle (18) of heat exchanger tubes that extend through the steam generatio... | 05/02/2006 |
| 6893622 | Process for the combustion of sulphur for the preparation of oleum and sulphuric acid with reduced (NO)x content The invention relates to a process for the continuous preparation of oleum of a concentration of 10 to 45% by weight of SO3 and/or sulphuric acid of a concentration of 94 to 100% by weight of H2SO4 by combustion of sulphur with atmos... | 05/17/2005 |
| 6673324 | Process and apparatus for the removal of dust in a reaction zone A process for treating a dust containing, gaseous or liquid feed stream in a reactor containing a plurality of particle beds, which have the capability, once the pressure drop across a bed has reached a maximum allowable level, to distribute most of the f... | 01/06/2004 |
| 6572835 | Method and apparatus for producing gaseous sulfur trioxide An apparatus and method for producing sulfur comprises a vessel containing a plurality of spaced-apart channels each having an upstream end communicating with an upstream manifold and a downstream end communicating with a downstream manifold. Each channel... | 06/03/2003 |
| 6521200 | Catalyst and process for oxidation of sulphur dioxide A process for the recovery of sulphur trioxide, solutions of sulphuric acid, or organic derivatives thereof, using organic compounds and/or supercritical fluids, and catalyst. The process comprises the steps of passing a mixture of SO2 and an o... | 02/18/2003 |
| 6500402 | Catalyst for oxidizing SO2 to SO3 and utilization of the catalyst in a method for producing sulfuric acid A catalyst for reacting SO2 with molecular oxygen to form SO3 is suited for a continuous operation at temperatures of 700° C. and above, when the same consists of a carrier and an active component connected with the carrier, the act... | 12/31/2002 |
| 6399040 | Process for generating recoverable sulfur containing compounds from a spent acid stream This invention relates to a process for generating recoverable sulfur containing compounds, e.g., sulfur dioxide, from a spent sulfuric acid stream by combusting and/or thermally decomposing the spent sulfuric acid stream in a furnace. The spent sulfuric ... | 06/04/2002 |
| 6153168 | Method of manufacturing sulphuric acid A process is provided for manufacturing sulfuric acid from a gas containing sulfur dioxide and steam. The sulfur dioxide and steam containing gas is subjected to a catalytic oxidation to convert the sulfur dioxide into sulfur trioxide so as to produce a g... | 11/28/2000 |
| 6080369 | Gas-to-gas heat exchangers for use in sulphuric acid plants A heat exchanger for use in a sulphuric acid manufacturing plant to effect heat transfer between desired gas streams selected from air, sulphur dioxide and sulphur trioxide. The exchanger provides for hot or cold split flow gas streams through the exchang... | 06/27/2000 |
| 6045770 | Sulfur dioxide generation using granulated or emulsoid sulfur feedstock A flue gas conditioning system (FGC) for conditioning the flue gas flowing in a flue from a boiler to an electrostatic precipitator by injecting sulfur trioxide into the flue gas upstream of the electrostatic precipitator. The FGC has a source (52) of gra... | 04/04/2000 |
| 5741475 | Catalytic reaction method A catalytic reaction apparatus includes a catalytic reaction vessel containing a catalyst for an exothermic reaction. First and second catalyst regions contain a catalyst and have different catalytic performances from one another. At least two raw materia... | 04/21/1998 |
| 5683670 | Method for increasing the production capacity of sulfuric acid plants and processes A process for removing SO2 from a gas mixture including SO3 and SO2 having a volume ratio of SO3 to SO2 greater than 1. The process includes intimately contacting the gas mixture in a contacting zone,... | 11/04/1997 |
| 5624653 | Method for producing sulphur trioxide The method for the production of sulphur trioxide, operating in a non-stanary regime, intend for sulphuric acid production. The aim of the present invention is to provide a method for the production of SO3 by catalytic oxidation of SO2, ... | 04/29/1997 |
| 5547495 | Flue gas conditioning system The present invention provides a flue gas conditioning system and method for generating conditioning agent used in the removal of entrained particles in a flue gas flow with an electrostatic precipitator. The invention involves a catalytic converter that ... | 08/20/1996 |
| 5538707 | Acid concentration control in SO3 absorption The concentration of sulfuric acid exiting a countercurrent SO3 absorber is controlled by controlled addition of water vapor to the SO3 -containing process gas stream entering the absorber. The novel means of concentration control is... | 07/23/1996 |
| 5520898 | Method for the preparation of highly reactive clay composites for the removal of sox from flue gas streams The use of base/clay composites materials as sorbents for the removal of SO2 and SO3 (SOx) from flue gas and other sulfur containing gas streams is described. The base is either an alkaline earth metal carbonate (eg. CaCO | 05/28/1996 |
| 5480620 | Catalytic converter A catalytic converter for converting sulfur dioxide to sulfur trioxide comprising an exterior shell of a heat resistant weldable metal; foundations from which the shell vertically extends; an interior tube of same metal vertically disposed within the shel... | 01/02/1996 |
| 5308587 | Cooled sulphur furnace bypass system Apparatus and process for the production of gaseous sulphur dioxide mixture for conversion to sulphur trioxide in a catalytic converter in the production of sulphuric acid by the contact process. Apparatus comprises the furnace to produce sulphur dioxide ... | 05/03/1994 |
| 5308456 | Molten carbonate fuel cell sulfur scrubber and method using same Sulfur compounds poison catalysts, such as the anode catalysts and reformer catalysts within molten carbonate fuel cell systems. This poisoning is eliminated using a sulfur scrubber 29 located prior to the inlet of the cathode chamber 13. Anode exhaust 19... | 05/03/1994 |
| 5302353 | Catalytic converter A converter comprising an exterior shell of a strong, heat resistant weldable metal having an interior core tube formed of such metal and vertically disposed, partway within the shell from an upper part thereof. A foundation is provided from which the she... | 04/12/1994 |
| 5288303 | Flue gas conditioning system A flue gas conditioning system features a self-contained sulfur burner control loop that operates to maintain a constant desired temperature supply of sulfur dioxide in air by varying the rate of supply of sulfur fuel to the sulfur burner, and the absence... | 02/22/1994 |
| 5240470 | In-duct flue gas conditioning system The present invention provides a flue gas conditioning system and method for generating conditioning agent used in the removal of entrained particles in a flue gas flow with an electrostatic precipitator. The invention involves the use of a catalytic conv... | 08/31/1993 |
| 5232670 | Catalytic converter An improved catalytic converter having a shell, a plurality of horizontal catalyst bed supports upon which catalyst is retained and arranged one bed support above another within the shell, and a plurality of horizontal divider plates, one located between ... | 08/03/1993 |
| 5118490 | Absorption of wet conversion gas An improved process for manufacture of sulfuric acid by catalytic oxidation of wet sulfur dioxide gas. Wet conversion gas is contacted with sulfuric acid in a heat recovery stage to effect absorption and generate the heat of absorption. Wet gas having a m... | 06/02/1992 |
| 5084257 | Sulfur dioxide removal from stack gas A process for the removal of sulfur dioxide from gasses produced by processes resulting in off gases at elevated temperatures as in the combustion of sulfur containing fuels such as coal and fuel oil by contacting the gasses with a composition including a... | 01/28/1992 |
| 5082645 | Waste acid recovery process A process for the recovery of sulphuric acid from a waste acid stream containing ammonium sulphate comprising vaporizing the waste acid and subsequently converting the ammonia and sulphur dioxide generated to nitrogen and sulphur trioxide, respectively. T... | 01/21/1992 |
| 4931265 | Conditioning process for dust-containing waste gas Disclosed is an improved process for the production of a sulfur trioxide conditioning gas, which consists in compensating the faulty "ambient gas temperature" in a simple and effective manner, such that all of the subsequent functions can take place at th... | 06/05/1990 |
| 4844723 | Gas conditioning for an electrostatic precipitator The apparatus receives a source of air and a sulfur-bearing source. The apparatus can condition the gas within an electrostatic precipitator of an industrial plant. The apparatus has a sulfur vessel having an output and an input. The sulfur vessel communi... | 07/04/1989 |
| 4781902 | Process for the removal of nitrogen oxides and sulphur oxides from flue gases The invention relates to a process for eliminating nitrogen oxides and sulphur oxides from a stream of flue gas containing nitrogen oxides and sulphur oxides comprising the steps of (a) adding ammonia to the stream of flue gas and contacting the resulting ... | 11/01/1988 |
| 4770674 | Gas conditioning for an electrostatic precipitator Apparatus and method for precipitation of fly ash from flue gas of a coal burner wherein liquid sulfur is burned to form SO2. The SO2 is converted to SO3 and injected into the flue gas. The sulfur burning process is modula... | 09/13/1988 |
| 4744967 | Process for the purification of exhaust gases containing oxides of nitrogen and sulfur A process is described for the purification of exhaust gases containing oxides of nitrogen and sulfur obtained from combustion installations and industrial production processes by selective catalytic reduction of the nitric oxides with ammonia, subsequent... | 05/17/1988 |
| 4687656 | Longitudinal reactor for chemical syntheses in gas phase and heterogeneous catalysts Process and apparatus for carrying out reactions in gas phase, wherein the gas is passed through a cylindrical catalytic reactor so designed that the catalyst bed is divided into several portions arranged in distinct vertical parallelepipedic compartments... | 08/18/1987 |
| 4659556 | Single step purification of sulfur dioxide gas prepared by the combustion of sulfur containing compounds A process for purifying sulfuric dioxide gas prepared by the combustion of sulfur containing compounds by scrubbing the gas with a sulfuric and composition having a sulfuric acid content of at least about 85 percent by weight based on the total weight of ... | 04/21/1987 |
| 4654205 | Sulphur trioxide absorption apparatus and process An absorption tower for absorbing sulphur trioxide in sulphuric acid having distinct upper and lower packed absorption zones wherein substantially all of the sulphur trioxide is absorbed by the sulphuric acid in the lower zone, while in the upper zone the... | 03/31/1987 |
| 4643887 | Production of sulfur trioxide, sulfuric acid and oleum A feed gas mixture with SO2 partial pressure of at least about 0.5 atmosphere and an O2 :SO2 mole ratio of between about 0.7:1 and about 1:1 is passed in plug flow through a packed bed of conversion catalyst. The catalyst ... | 02/17/1987 |
| 4591495 | Method and apparatus for making sulphuric acid In a system using the double absorption process for sulphuric acid manufacture, a single acid circulation system and a single cooler are employed. Acid from the exit of the air drying tower and final absorber tower are mixed in a common reservoir, while a... | 05/27/1986 |
| 4591494 | Method and apparatus for making sulphuric acid In a system using the double absorption process for sulphuric acid manufacture, a single acid circulation system and a single cooler are employed. Acid from the exit of the air drying tower is circulated to and flows through the final absorber where it ab... | 05/27/1986 |
