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| Number | Title | Issue Date |
| 7871593 | Process and apparatus for the catalytic oxidation of SO-containing gases by means of oxygen Process for the continuous catalytic complete or partial oxidation of a starting gas containing from 0.1 to 66% by volume of sulphur dioxide plus oxygen, in which the catalyst is kept active by means of pseudoisothermal process conditions with introduction or remova... | 01/18/2011 |
| 7507391 | Process and apparatus for the production of sulphur oxides Sulphur oxides are generated from a liquid stream of hydrogen sulphide by feeding the liquid stream to a vacuum stripper where the stream is contacted with a stripping gas including steam under reduce pressure. Hydrogen sulphide is transferred to the stripping gas, ... | 03/24/2009 |
| 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 |
| 7306774 | Reactive membrane process for the removal of vapor phase contaminants Generally, the present invention provides a method and apparatus for removing a vapor phase contaminant from a gas stream, thereby reducing the concentration of the vapor phase contaminant in the gas stream. In one embodiment, the present invention provides a method... | 12/11/2007 |
| 6740302 | Method for producing high-purity sulphuric acid The invention relates to a novel method for producing high-purity sulfuric acid for use in the semiconductor industry. The method comprises the addition of a hydrogen peroxide solution to an engineered oelum in order to reduce the SO2 concentration, evapo... | 05/25/2004 |
| 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 |
| 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 |
| 6287534 | Method for manufacturing sulfuric acid A method for accelerating the rate of chemical reactions is disclosed consisting of subjecting a gas stream from a flue stream, industrial source, or utility boiler to a high time rate of change of temperature increase so as to convert certain polyatomic ... | 09/11/2001 |
| 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 |
| 5935538 | Apparatus and method for photocatalytic conditioning of flue gas fly-ash particles A process is provided for conditioning fly-ash present in flue gas which also contains sulfur dioxide and steam by subjecting the fly-ash containing flue gas to ultraviolet radiation so as to convert steam present in the flue gas into hydroxyl radicals wh... | 08/10/1999 |
| 5824277 | Plasma oxidation of an exhaust gas stream from chlorinating titanium-containing material A process is disclosed for treating an exhaust gas stream containing COS and CO arising from chlorinating titanium-containing material with a cold plasma wherein oxygen is present and selectively oxidizing COS.... | 10/20/1998 |
| 5791268 | SO3 flue gas conditioning system with catalytic converter temperature control by injection of water An improved method and system for cooling the sulfur dioxide gas stream flowing from a sulfur furnace to a catalytic converter in a sulfur trioxide flue gas conditioning system. Water is injected into the sulfur dioxide gas stream upstream of the catalyti... | 08/11/1998 |
| 5785938 | Process using recyclable sorbents for the removal of sox from flue gases and other gas streams A process for removing and then capturing noxious sulfur oxides from gas streams, particularly from the flue gases of coal-burning power plants, using Ni-containing heated layered double hydroxide (LDH) as recyclable sorbents. The sorbent compositions con... | 07/28/1998 |
| 5780383 | Solid superacid catalyst comprising group VII metal and having Ho less than -18 The invention is a solid catalyst having acid strength Ho less than -18. Such catalysts are characterized by the ability to react with very weak bases, such as butane, at relatively low temperatures, for example temperatures in the range from 2... | 07/14/1998 |
| 5753201 | Method for manufacturing sulfuric acid A method for manufacturing sulfuric acid from a gas containing sulfur oxides, water and oxygen comprising subjecting the sulfur oxides rich gas to either an adiabatic compressor or a flame impinger to rapidly increase the temperature so that the sulfur di... | 05/19/1998 |
| 5503821 | Methods for recovering high grade process energy from a contact sulfuric acid process An improved process for the recovery of high grade energy from a contact sulfuric acid manufacturing process. Improvements include: injection of steam between an intermediate catalyst stage and a heat recovery absorption tower and/or a heat exchanger for ... | 04/02/1996 |
| 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 |
| 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 |
| 5306477 | Use of wrought and cast materials and welding fillers for making and using hot concentrated sulphuric acid or oleum In a process such as the preparation of sulphuric acid wherein a wrought or cast material or a welding filler is contacted with hot concentrated sulphuric acid or oleum of up to 10 wt-%, the improvement which comprises forming the contact portion of said ... | 04/26/1994 |
| 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 |
| 5194239 | Oxygen-based noncatalytic sulfuric acid process A noncatalytic process for producing sulfur trioxide and sulfuric acid in which sulfur is combusted with an oxygen-rich gas in the presence of recycled sulfur dioxide-rich gas to form sulfur trioxide which is absorbed in sulfuric acid and yield a sulfur d... | 03/16/1993 |
| 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 |
| 5022332 | Combustion method for improved endothermic dissociation A method for endothermically dissociating contaminated acid wherein high velocity oxidant causes a recirculation flow within a combustion zone and combusts with fuel to release heat and wherein the heat is efficiently applied by the internal recirculation... | 06/11/1991 |
| 4996038 | Heat recovery from concentrated sulfuric acid A method and apparatus for the recovery of heat from a sulfuric acid process are provided. Sulfur trioxide is absorbed into hot concentrated sulfuric acid, acid having a concentration greater than 98% and less than 101% and a temperature greater than 120Â... | 02/26/1991 |
| 4971781 | Working up sodium sulfate-containing residues Sodium sulfate-containing residues are worked up by reducing the sulfate by a process in which the sulfate or a mixture or solution of the sulfate is thermally cleaved by adding oxygen, air or oxygen-enriched air at above 1000° C., in particular above 12... | 11/20/1990 |
| 4938943 | Process for production of chlorine dioxide The present invention relates to a process for production of chlorine dioxide by reacting in a reaction vessel an alkali metal chlorate, sulfuric acid and a reducing agent, preferably methanol, in proportions to generate chlorine dioxide in a reaction med... | 07/03/1990 |
| 4915912 | Apparatus for the generation of sulfur trioxide reagent and sulfonation of the surface of polymeric resins The present invention provides an apparatus for generating a reagent of sulfur trioxide in a carrier which includes a reagent generator. The reagent generator has associated therewith means for introducing a source of sulfur trioxide into the reagent gene... | 04/10/1990 |
| 4902493 | Process for the generation of sulfur trioxide reagent and sulfonation of the surface of polymeric resins The present invention provides a process for generating a reagent of sulfur trioxide in a carrier. A source of sulfur trioxide, a carrier, and oleum are introduced into a reagent generator. The sulfur trioxide, carrier, and oleum are then contacted to pro... | 02/20/1990 |
| 4673560 | Generation of sulphur trioxide from oleum using microwave energy Process and apparatus for the generation of sulphur trioxide from oleum using microwave energy for use in the sulphonation and nitration of organic compounds and the fortification of oleum. The process provides improved control of production and concentra... | 06/16/1987 |
| 4670242 | Heat recovery from concentrated sulfuric acid A method and apparatus for the recovery of heat from a sulfuric acid process are provided. Sulfur trioxide is absorbed into hot concentrated sulfuric acid, acid having a concentration greater than 98% and less than 101% and a temperature greater than 120Â... | 06/02/1987 |
| 4663142 | Generation of sulphur trioxide from oleum A continuous process for the generation of sulphur trioxide from oleum suitable for use in the sulphonation of organic compounds which comprises continuously introducing oleum feed to a sulphur trioxide desorption tower; continuously introducing a recycle... | 05/05/1987 |
| 4576813 | Heat recovery from concentrated sulfuric acid A method and apparatus for the recovery of heat from a sulfuric acid process are provided. Sulfuric trioxide is absorbed into hot concentrated sulfuric acid, acid having a concentration greater than 98% and less than 101% and a temperature greater than 12... | 03/18/1986 |
| 4543244 | Use of high silicon Cr Ni steel in H2 SO4 manufacture Apparatus and process for the manufacture of sulphuric acid by the contact process of the type comprising at least one gas-concentrated sulphuric acid contacting unit and a sulphuric acid heat exchanger characterized in that the contacting unit and/or hea... | 09/24/1985 |
| 4496441 | Desulfurization of coal A system for desulfurization of sulfur-containing coal comprises apparatus for comminuting sulfur-containing coal, a gas/solid reactor having an inlet and an outlet, a connection or conduit for supplying the comminuted sulfur-containing coal to the reacto... | 01/29/1985 |
| 4415543 | Process for treating phospho-gypsum waste product from wet-acid process of making phosphoric acid This disclosure concerns a process for treating phospho-gypsum waste product from the wet process method of making phosphoric acid including the steps of water washing the phospho-gypsum to remove all but an acceptable level of fluorine before the phospho... | 11/15/1983 |
| 4191732 | Method of removing sulfur dioxide from gases Sulfur dioxide is removed from a sulfur dioxide-containing gas mixture by contacting the gas mixture with a monoolefin or diolefin.... | 03/04/1980 |
| 4139596 | Producing sulphuric acid This invention is based on the factors that both oxygen gas and oxides of sulphur as well as hydrogen sulphide are highly soluble in saturated, halogenated hydrocarbon liquids which are also dielectric liquids. The absorber liquid, saturated with dissolve... | 02/13/1979 |
| 4102951 | Calcination of basic ferric sulphates A two-step process for the calcination of basic ferric sulphates in which the basic ferric sulphate is dehydrated by heating in a relatively low temperature range and the dehydrated product is then decomposed by heating in a relatively high temperature ra... | 07/25/1978 |
| 4091864 | Process for the conversion, conveyance and utilization of energy An energy conversion, conveyance and utilisation system, particularly for providing process heat in industrial plants, which makes use of a source of heat such as a nuclear reactor to dissociate sulfur trioxide according to the reaction: 2SO3 .... | 05/30/1978 |
| 3983218 | Method for dry removal of sulfur dioxide from furnace flue, coal and other gases A process using run-of-the-mill flue dust from open hearth and basic oxygen steel making processes having certain iron-zinc values as a sulfur dioxide absorbent and pollutant control for industrial and public utility furnace flue gases, which materials, u... | 09/28/1976 |
