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| Number | Title | Issue Date |
| 8153007 | Method of treating wastewater A method of treating a wastewater, containing the steps of: filtering a wastewater supplied into an activated sludge tank and biologically-treated therein, in a membrane module installed outside the activated sludge tank; chemical-cleaning the membrane module with a... | 04/10/2012 |
| 7815874 | Reactor A reactor including a reactor vessel and heat exchange tubes provided in the reactor vessel. The reactor vessel includes a tubesheet and is configured to receive a reaction fluid. The tubesheet has a first plate member configured to contact the reaction fluid and a ... | 10/19/2010 |
| 7763215 | Reactor having detachably fixed tubesheet plate member A reactor including a reactor vessel and heat exchange tubes provided in the reactor vessel. The reactor vessel includes a tubesheet and is configured to receive a reaction fluid. The tubesheet has a first plate member configured to contact the reaction fluid and a ... | 07/27/2010 |
| 7641797 | Method of treating waste liquid from production plant for hydrocarbons or oxygen-containing compounds A method for treating a formaldehyde-containing waste liquid, which is formed as a byproduct in a plant for the production of hydrocarbons or oxygen-containing compounds, containing the steps of: subjecting formaldehyde in the liquid to chemical treatment; and treat... | 01/05/2010 |
| 7582795 | Apparatus for synthesizing urea and method for revamping the same It is intended to enable an apparatus for synthesizing urea and a method for revamping the same to place a heavy condenser at a relatively low position and to circumvent problems associated with letting a process fluid flow within a tube in the condenser. The presen... | 09/01/2009 |
| 7582237 | Process for preparing granular urea product In a granulating process for preparing granular urea from an aqueous urea solution using a fluidized bed method or a fluidized, spouted bed method, an aqueous urea solution having a urea concentration of 94-98.5 wt % is used and the operational temperature of the fl... | 09/01/2009 |
| 7579502 | Apparatus for synthesizing urea It is intended to enable more smooth operation in an apparatus for synthesizing urea by circumventing the downward flow of a urea synthesis solution which is a gas-liquid two-phase flow and stabilizing the flow of the urea synthesis solution still remaining the gas-... | 08/25/2009 |
| 7517373 | Reformer A device to reform a raw material gas into a synthesis gas rich in hydrogen and carbon monoxide is disclosed. The device includes a vessel, a floating head, a plurality of reaction tubes, inlets and outlets for raw material and heating gases, and a cooled fixed tube... | 04/14/2009 |
| 7498464 | Method and apparatus for synthesizing urea In a process and an apparatus for synthesizing urea which synthesize urea from ammonia and carbon dioxide, the operating condition can be grasped easily and with good accuracy. A process for synthesizing urea which includes: a reaction step of obtaining a urea synth... | 03/03/2009 |
| 7357003 | Process and apparatus for separation of hydrocarbons There are provided a process for separation of hydrocarbons including the steps of: (a) a feed gas is cooled and partly condensed, and separated into a gas and a liquid; (b) the liquid obtained in step (a) is supplied to a distillation column; (c) the gas obtained i... | 04/15/2008 |
| 7347903 | Duplex stainless steel for urea manufacturing plants A duplex stainless steel for use in urea manufacturing plants, in mass %, consisting of C: 0.03% or less, Si: 0.5% or less, Mn: 2% or less, P: 0.04% or less, S: 0.003% or less, Cr: 26% or more, but less than 28%, Ni: 6-10%, Mo: 0.2-1.7%, W: more than 2%, but no more... | 03/25/2008 |
| 7344663 | Multi-nozzle for granulation and method for manufacturing granular product The present invention provides a granulation method with increased drying effect while assuring the pressure for spraying the aqueous solution and the necessary number of nozzles equivalent to those of conventional design. Specifically, the granulation method uses a... | 03/18/2008 |
| 7310972 | Process and apparatus for separation of hydrocarbons from liquefied natural gas An apparatus and process for separating a feed liquefied natural gas containing at least methane and a hydrocarbon less volatile the methane, into a product natural gas enriched with methane and lean in hydrocarbon less volatile than methane and a heavier fraction l... | 12/25/2007 |
| 7270689 | Reformer A reformer for reacting a raw material gas to be reformed, with an oxidizing agent gas and a reforming agent gas in the presence of an oxidation catalyst and a reforming catalyst to obtain a hydrogen-containing gas, including: a set of catalyst layers consisting of ... | 09/18/2007 |
| 7202387 | Process for producing dimethyl ether A process for producing dimethyl ether, which includes dehydrating methanol in vapor phase in the presence of an activated alumina catalyst having an average pore radius of 2.5 nm to 8.0 nm both inclusive and having a sodium oxide content of 0.07 wt % or less. This ... | 04/10/2007 |
| 7201889 | Fuel reforming method and system A fuel reforming method includes the step of supplying carbon-containing fuel and steam to a reactor filled with a fuel reforming catalyst and a CO2 absorbent and discharging CO2, and setting the absorbent at an absorption temperature, thereby ... | 04/10/2007 |
| 7153693 | Method and apparatus for determining urea concentration A method for determining a urea concentration in an aqueous solution containing urea, includes: hydrolyzing the urea in the aqueous solution, measuring an electric conductivity χ of the aqueous solution, and determining the urea concentration in the aqueous solutio... | 12/26/2006 |
| 7087204 | Reaction unit A reactor which is a reactor (4) in the form of a cylindrical vessel having a liquid inlet and a liquid outlet and elongated in a flowing direction, comprising, in the interior, a drive shaft (6) coaxial with the reactor, one or more stages of plate-sh... | 08/08/2006 |
| 7052655 | Urea synthesis process and apparatus Urea is prepared by reacting ammonia and carbon dioxide in an apparatus comprising a vertical condensation and synthesis column and a stripper, to provide a urea synthesis solution comprising urea, unreacted ammonia, unreacted carbon dioxide and water. The urea synt... | 05/30/2006 |
| 6997965 | Method for the gasification of coal A method of the gasification of coal using oxygen and steam is provided wherein the coal is gasified at a temperature of from 1000 to 2500° C. and a pressure of from 1 to 100 kg/cm2 using oxygen generated by electrolyzing water and steam having a tempera... | 02/14/2006 |
| 6881767 | Flon-resistant rubber modified polystryrene composition A rubber modified polystyrene composition comprising polybutadiene particles dispersed in polystyrene, wherein the polybutadiene particles have an average volume particle diameter of 6 to 13 microns, and the composition has a gel content of 25 to 35% by weight and a... | 04/19/2005 |
| 6797153 | Catalyst for hydrocracking of heavy oils and method of hydrocracking heavy oils A catalyst for the hydrocracking of heavy oils contains iron and active carbon having an MCH conversion rate of 40-80%, a specific surface area of 600-1000 m2/g of, a pore volume of 0.5 to 1.4 cm3/g, 2-50 nanometers' mesopore volume of not less... | 09/28/2004 |
| 6657010 | Oil-resistant rubber modified polystyrene composition An oil resistant rubber modified polystyrene composition comprises polybutadiene rubber particles having an average volume particle diameter of 6 to 13 μm dispersed in polystyrene. The oil resistant rubber modified polystyrene of the present invention ha... | 12/02/2003 |
| 6564990 | Method of welding high chromium austenitic stainless steel pipe and shielding gas mixture for welding Stainless steels are welded using a shielding gas including 88 to 98.9 mole % Ar, 1 to 10 mole % H2, and 0.1 to 2.0 mole % CO2. The shielding gas permits low sulfur, high chromium, austenitic stainless steel pipes to be joined with w... | 05/20/2003 |
| 6540973 | Process for producing hydrogen chloride The process according to the invention comprises bringing gaseous hydrogen chloride in a non-condensable gas into contact with an absorbing medium selected from water or a dilute aqueous hydrogen chloride solution in an absorption column to cause the medi... | 04/01/2003 |
| 6476262 | Urea synthesis process and apparatus Urea is prepared by reacting ammonia and carbon dioxide in an apparatus comprising a vertical condensation and synthesis column and a stripper, to provide a urea synthesis solution comprising urea, unreacted ammonia, unreacted carbon dioxide and water. Th... | 11/05/2002 |
| 6467513 | Method for packing catalyst and device therefor In a reactor in which reaction tube(s), cooling tubes, heating tubes or combinations thereof are provided, a method for packing a catalyst comprising a step of packing the catalyst in the space formed between the inner wall of the reactor and the outer wa... | 10/22/2002 |
| 6428760 | Method for desulfurizing exhaust gas The present invention relates to the improvement of a replenishment method of a magnesium-based compound and to the improvement of a double decomposition method, which can be used in a magnesium hydroxide desulfurization method. In the improved replenishm... | 08/06/2002 |
| 6426434 | Process for the synthesis of urea A urea synthesis process with improved heat economy, wherein a urea synthesis solution obtained by removing most of the unreacted ammonium carbamate by stripping with carbon dioxide at a pressure approximately equal to a urea synthesis pressure is subject... | 07/30/2002 |
| 6261991 | Steam-reforming catalyst for hydrocarbons A catalyst for reforming of hydrocarbons with less reduction in activity. An improved steam-reforming catalyst for hydrocarbons, wherein the active component Ni is supported on an -Al2 O3 or CaO--Al2 O3 c... | 07/17/2001 |
| 6203730 | Method for granulation and granulator There is disclosed an improved, energy-saving granulation method, wherein use is made of a granulator (1) having a bottom floor (9) of a granulation section whose bottom is a perforated plate, an upper air feed pipe (23) for feeding air for fluidization t... | 03/20/2001 |
| 6200540 | Urea synthesis apparatus A vertical condenser is installed on or above a urea synthesis column to condense the mixed gas from the stripper by bringing it into contact with an absorption medium under cooling. A first down pipe for making the top part of the condenser communicate w... | 03/13/2001 |
| 6179893 | Process for generation of fertilizer granules containing urea and ammonium sulfate There is disclosed a process to produce fertilizer granules containing urea and ammonium sulfate with a high ammonium sulfate concentration of ࣘ60 wt. % in a fluidized bed granulator, which process comprises the steps of: a) a molten urea suspension con... | 01/30/2001 |
| 6124426 | Method for removing volatile materials from a polymer composition A method for removing volatile materials, comprises adding a blowing aid to a polymer composition containing volatile materials, mixing them in a static mixing apparatus, and extruding the resultant mixture by an extruding apparatus into a devolatilizing ... | 09/26/2000 |
| 6100303 | Method of producing methanol The present invention provides a process for producing methanol which gives reduced construction costs of plant and improved energy efficiency of the whole plant. According to this process for producing methanol, methanol is manufactured by subjecting a f... | 08/08/2000 |
| 6093850 | Process for the synthesis of urea and equipment therefor The present invention provides an improved process for synthesizing urea from ammonia and carbon dioxide while preventing corrosion of sites, that are to be in contact with a condensate, of the joints of a tube plate and cooling tubes in a condenser insta... | 07/25/2000 |
| 6041272 | Desulfurization process for flue gases Formation of calcium sulfite in a desulfurization column for desulfurizing flue gas is prevented by maintaining the pH of the sorption liquid in the column in the range of 5.5-7.0 and the chemical oxygen demand of the sorption liquid below an upper value ... | 03/21/2000 |
| 5965071 | Process for preparing granular urea The present invention provides a process for preparing granular urea, which solves the problem of removing moisture in a prilling tower method and the problem of concentrating diluted formaldehyde in granulation by a fluidized, spouted bed method when ure... | 10/12/1999 |
| 5964901 | Method for detecting clogging and granulation method There is disclosed a method for detecting clogging of air feed pipes, comprising air feed pipes (15), each having an outlet (13) for jetting air into a granulation section (1), and jetting nozzles (13), each situated at the center of the air outlet of a s... | 10/12/1999 |
| 5936122 | Urea synthesis process and apparatus therefor A vertical condenser is installed on or above a urea synthesis column to condense the mixed gas from the stripper by bringing it into contact with an absorption medium under cooling. A first down pipe for making the top part of the condenser communicate w... | 08/10/1999 |
