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| Number | Title | Issue Date |
| 8052953 | Method for recovering sulfuric acid from concentrated acid hydrolysate of plant cellulose material A method for recovering sulfuric acid from concentrated acid hydrolysate of plant cellulose material is disclosed. In some of the examples, the concentrated acid hydrolysate is mixed with a liquid organic precipitant, with the sugars in the hydrolysate being precipi... | 11/08/2011 |
| 7988942 | Method and system for concentrating waste sulphuric acids from nitration processes A method for recovering diluted waste sulfuric acid by extractive rectification with concentrated sulfuric acid which is re-concentrated for reutilization. Waste sulfuric acid from the nitration process is fed into a first column, optionally together with another wa... | 08/02/2011 |
| 7867470 | On-site manufacture of sulfuric acid A method and system for on-site production of solutions is described according to embodiments. In an embodiment, the solution is sulfuric acid. ... | 01/11/2011 |
| 7854915 | Method of producing sulfuric acid and installation for carrying out the method The invention relates to a method of producing sulfuric acid wherein an SO2-containing raw gas produced in a sulfuric-acid recovery plant is passed through at least one reactor in which a catalytic reaction of SO2 to SO3 takes place,... | 12/21/2010 |
| 7833507 | Process for the production of sulphuric acid Process for the production of concentrated sulphuric acid and oleum from feed gases with up to 70% SO2+SO3 (SOx) and a content of H2O corresponding to H2O/SO3 molar ratios up to 1.6, particularly in t... | 11/16/2010 |
| 7820134 | Process and plant for producing sulfuric acid There are described a process and a plant for producing sulfuric acid by catalytic oxidation of SO2 to SO3 and subsequent absorption of SO3 in sulfuric acid, wherein the SO3 is introduced into a first absorption stage and ... | 10/26/2010 |
| 7799310 | Systems and methods for generating sulfuric acid Methods and systems for generating sulfuric acid (102) are disclosed. In some embodiments, the method includes combusting a sulfur-containing material (114) with a gas including oxygen (116) to produce a first stream of sulfur dioxide (118 | 09/21/2010 |
| 7794685 | Method for producing hydrogen and sulphuric acid The invention relates to a method for producing gaseous hydrogen and strong sulphuric acid (97-100 wt-%) simultaneously from sulphur dioxide gas and water. Sulphur dioxide gas stream is divided into two separate sub-streams, the first sub-stream is routed for water ... | 09/14/2010 |
| 7740827 | Ruthenium oxide catalysts for conversion of sulfur dioxide to sulfur trioxide The present invention relates generally to catalysts comprising ruthenium oxide and to processes for catalyzing the oxidation and conversion of sulfur dioxide (SO2) to sulfur trioxide (SO3) using such catalysts. SO2 at low concentrat... | 06/22/2010 |
| 7691360 | Process and plant for the manufacture of sulphuric acid from gases rich in sulphur dioxide The present invention is concerned with a process and a plant for the production of sulphuric acid wherein a sulphur dioxide-containing feed gas is converted, at least in part, with oxygen in at least two contact stages of main contacts arranged in series, to genera... | 04/06/2010 |
| 7674449 | Process and apparatus for the combustion of a sulfur-containing liquid Apparatus and processes for the production of a sulfur dioxide-containing combustion gas are provided in which a sulfur-containing liquid is pneumatically atomized with a sulfur gun or lance that utilizes an atomizing gas to form an atomized combustion mixture for c... | 03/09/2010 |
| 7595035 | Process for the recovery of sulfuric acid Process for the recovery of sulfuric acid comprising: (a) contacting a stream containing sulfuric acid vapor and/or sulfur trioxide in an absorption stage with a ionic liquid absorbent, (b) withdrawing a gas substantially free of sulfuric a... | 09/29/2009 |
| 7452521 | Method for the removal of mercury from sulphuric acid with thiosulphate precipitation This invention relates to a method for removing mercury from dilute sulphuric acid. According to the method sulphuric acid solution is scrubbed with an aqueous solution containing thiosulphate, which precipitates the mercury present in the sulphuric acid solution ei... | 11/18/2008 |
| 7442352 | Flue gas purification process using a sorbent polymer composite material Process for removing sulfur oxides, mercury vapor, and fine particulate matters from industrial flue gases that contain such pollutants. Pollutants are removed by modules, which contain microporous adsorbent (i.e., sorbent) material held within a polymer matrix. The... | 10/28/2008 |
| 7442363 | Hydrogen iodide manufacturing method and hydrogen iodide manufacturing apparatus A hydrogen iodide manufacturing method which includes a step of producing aqueous solution of hydrogen iodide and sulfuric acid by causing iodine-containing aqueous solution and sulfur dioxide to react with each other in a pressurized condition. The pressurized cond... | 10/28/2008 |
| 7442359 | Recovery of sulphuric acid The invention is directed to a process for the recovery of sulphuric acid from a mixture comprising sulphuric acid and hydrocarbons, in particular carbohydrates. In accordance with the present invention the mixture comprising sulphuric acid and carbohydrates, is con... | 10/28/2008 |
| 7416716 | Purification of carbon dioxide SO2 and/or NOx are removed from gaseous CO2 at elevated pressure(s) in the presence of molecular oxygen and water and, when SO2 is to be removed, NOx, to convert SO2 to sulfuric acid and/or NOx | 08/26/2008 |
| 7404938 | Emission control system Methods and apparatus utilizing hydrogen peroxide are useful to reduce NOx, SOx and mercury (or other heavy metal) emissions from combustion flue gas streams. Continuous concentration of hydrogen peroxide to levels approaching or exceeding propellant-grade hydrogen ... | 07/29/2008 |
| 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 |
| 7351391 | System and method for converting the spent remnants of a first pickling acid solution into a usable second pickling acid solution A system and method of economically converting a spent first pickling acid solution that contains hydrochloric acid, water and ferrous chloride into a suitable second pickling solution. Sulfuric acid is added to the first pickling acid solution. This produces a rege... | 04/01/2008 |
| 7351310 | Rectificative separation of fluids comprising (meth) acrylic monomers A process for rectificatively separating fluids including (meth)acrylic monomers in a rectification column by directly cooling the vapor including (meth)acrylic monomers rising to the top of the rectification column to form top condensate including (meth)acrylic mon... | 04/01/2008 |
| 7351392 | Process for the high recovery efficiency of sulfur from an acid gas stream A combined process for the recovery of sulfur from an acid gas stream. The combined process includes both a Claus unit and a unit for treating the Claus tail gas with caustic to remove hydrogen sulfide therefrom and to biologically oxidize the hydrogen sulfide using... | 04/01/2008 |
| 7344692 | Process for regenerating spent sulfuric acid A process for the regeneration of sulfuric acid contaminated with hydrocarbons and water to produce pure concentration acid comprising: contacting sulfuric acid contaminated with hydrocarbons and water with oxygen and elemental sulfur in the presence of a vanadium c... | 03/18/2008 |
| 7341658 | Recovery of heavy minerals from a tar sand A process for recovering heavy minerals (e.g., titanium minerals such as TiO2) from a feedstock comprising tar sands or a tar sands-derived solids fraction. The feedstock comprises bitumen and heavy minerals. The process comprises the steps of: (i) contac... | 03/11/2008 |
| 7335340 | Flue gas desulfurization apparatus and flue gas desulfurization system A flue gas desulfurization apparatus includes at least one activated carbon fiber board 20 provided in a catalyst unit 6, the board being formed by alternatingly juxtaposing one or more plate-like activated carbon fiber sheets and one or more corrugate... | 02/26/2008 |
| 7318857 | Dual flow wet electrostatic precipitator An apparatus for removing particulate matter from a gas stream containing particular matter, the apparatus comprising: a mist-producing element that mixes a gas stream entering the apparatus with liquid droplets; a down-flow Wet Electrostatic Precipitator (WESP) sec... | 01/15/2008 |
| 7273599 | Method for decoloring sulfuric acid A method for decoloring sulfuric acid containing organic reatives by which it is possible to obtain a crystalline sulfuric acid having a color index of less that 30 APHA unities, by adding controlled amounts of potassium chlorate and hydrogen peroxide in a controlle... | 09/25/2007 |
| 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 |
| 7182919 | Sulphurous acid generator with air injector This invention presents a sulphurous acid generator which employs a combination of novel blending contact and mixing mechanisms which maximize the efficiency and duration of contact between sulphur dioxide gas and water to form sulphurous acid in an open nonpressuri... | 02/27/2007 |
| 7179438 | Methods and apparatus for recovering gypsum and magnesium hydroxide The present invention provides methods and apparatus for treating flue gas containing sulfur dioxide using a scrubber, and more particularly relates to recovering gypsum and magnesium hydroxide products from the scrubber blowdown. The gypsum and magnesium hydroxide ... | 02/20/2007 |
| 7141220 | Open system sulphurous acid generator This invention presents a sulphurous acid generator which employs a combination of novel blending, contact and mixing mechanisms which maximize the efficiency and duration of contact between sulphur dioxide gas and water to form sulphurous acid in an open nonpressur... | 11/28/2006 |
| 7127959 | Process for assessing inhibition of petroleum corrosion The present invention is an apparatus for simulating corrosion activity in liquid and vapor/condensate corrosion environments. The apparatus includes a container, including a lower region containing the liquid and an upper region, including a condenser, a heater for... | 10/31/2006 |
| 7077884 | Hydrogen sulfide scrubber using polymeric amine and associated methods A hydrogen sulfide scrubber includes first and second scrubber tanks with scrubber media contained therein. Scrubbing solution circulators each include a dispenser for dispensing scrubbing solution into contact with the scrubber media, a sump for collecting the scru... | 07/18/2006 |
| 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 |
| 7045364 | Electrochemical immunoassays using colloidal metal markers The invention concerns a method for detecting or quantifying a biological substance coupled with a colloidal metal particle by electrochemical detection, characterised in that it comprises a step which consists in dissolving by chemical treatment of said colloidal m... | 05/16/2006 |
| 7041152 | Method for processing elemental sulfur-bearing materials using high temperature pressure leaching The present invention relates generally to a process for the production of sulfuric acid and liberation of precious metal values from materials containing sulfur through pressure leaching operations. In accordance with various aspects of the present invention, the s... | 05/09/2006 |
| 7037474 | Use of sulfide-containing liquors for removing mercury from flue gases A method and apparatus for reducing and removing mercury in industrial gases, such as a flue gas, produced by the combustion of fossil fuels, such as coal, adds sulfide ions to the flue gas as it passes through a scrubber. Ideally, the source of these sulfide ions m... | 05/02/2006 |
| 7033565 | Production of sulphuric acid from a feed gas with varying concentration of sulphur dioxide A process for the production of sulphuric acid from a sulphur dioxide containing feed gas with concentration of SO2 fluctuating between 0 and 100 mole % SO2 comprising the steps of contacting the feed gas with an aqueous solution comprising 0â€... | 04/25/2006 |
| 7029639 | Desulfurizer comprising activated carbon and method of desulfurization A desulfurization apparatus for desulfurizing a flue gas containing sulfur oxides through contact with a porous carbon material. The carbon material, which is provided in a desulfurization tower, is at least one species selected from activated carbon and activated c... | 04/18/2006 |
| 7025808 | Reduction of the aerosol-related discharge from a separation column and apparatus therefor A process is proposed for reducing the aerosol-related discharge from a separation column (1) in which one or more components are separated off from a gaseous or liquid starting mixture (G) at actively separating internals (2), aerosols being present o... | 04/11/2006 |
