Patents by Inventor Karl-Heinz Dorr
Karl-Heinz Dorr has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5030415Abstract: Ferritic chromium-molybdenum steels containing26 to 30% chromium1.8 to 3.0% molybdenum3.0 to 4.5% nickelcarbon.ltoreq.0.02%silicon.ltoreq.1.00%manganese.ltoreq.1.00%sulfur.ltoreq.0.015%carbon+nitrogen.ltoreq.0.045%niobium.gtoreq.12.times.%C.ltoreq.1.2%balance iron and impurities which are due to the melting technologyare used as corrosion-resisting material to make structural parts which are resistant to sulfuric acid in a concentration of and above 94% by weight and at a temperature up to the boiling point of the sulfuric acid.Type: GrantFiled: August 24, 1989Date of Patent: July 9, 1991Assignee: Metallegesellschaft AktiengesellschaftInventors: Karl-Heinz Dorr, Hermann Muller, Ulrich Sander, Wolfram Schalk, Ernst Wallis
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Patent number: 5030428Abstract: In flue gases or other humid exhaust gases which contain NO.sub.x and SO.sub.2, the NO.sub.x content is reduced and the SO.sub.2 content is oxidized to SO.sub.3 by a catalytic processing and the SO.sub.3 content is subsequently condensed as sulfuric acid. In order to prevent a clogging and deterioration of the catalyst and a contamination of the sulfuric acid the flue gas is subjected before the catalytic processing to a fine dedusting by a scrubbing with hot dilute sulfuric acid. In dependence on the water content of the flue gases the concentration of sulfuric acid in the dilute sulfuric acid and the temperature of the latter are adjusted so that no water will be transferred from the flue gases to the dilute sulfuric acid and no water or only a small amount of water will be transferred from the dilute sulfuric acid to the flue gas.Type: GrantFiled: March 20, 1989Date of Patent: July 9, 1991Assignees: Metallgesellschaft AG, BASF AGInventors: Karl-Heinz Dorr, Hugo Grimm, Heinz Enumann, Jurgen Adlkofer
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Patent number: 4910011Abstract: In flue gases or other humid exhaust gases which are relatively cold and contain SO.sub.2, NO.sub.2 and other gaseous pollutants, the SO.sub.2 content is oxidized to SO.sub.3 and the NO content is reduced by a catalytic treatment, the SO.sub.3 content is condensed as sulfuric acid and other gaseous pollutants are removed by being scrubbed with aqueous liquids at low temperatures. In order to heat up the flue gas to the temperature required for the catalysis, the flue gas is heated up in a first heating-up stage by an indirect heat exchange with the catalytically treated gas before the catalytic treatment, the heated-up gas is heated up further in a second heating-up stage to the temperature required for the catalytic treatment, the catalytically treated gas which has been cooled in the first heating-up stage is cooled further in an indirect heat exchanger below the dew point temperature of sulfuric acid and is subsequently fed to an SO.sub.3 condenser.Type: GrantFiled: December 14, 1988Date of Patent: March 20, 1990Assignees: Metallgesellschaft AG, Stadtwerke Munster GmbHInventors: Karl-Heinz Dorr, Hugo Grimm, Heinz Neumann, Norbert Olhms
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Patent number: 4582481Abstract: The moist ores are dried in direct contact with hot dry tail gas from a contact process plant for producing sulfuric acid. The dried ores are roasted, the SO.sub.2 -containing gases produced by the roasting are processed in the contact process plant to produce sulfuric acid, and the tail gases from the contact process plant are heated up with surplus heat from the contact process plant. These heated tail gases are used to dry the moist ores.Type: GrantFiled: December 21, 1984Date of Patent: April 15, 1986Assignee: Metallgesellschaft AktiengesellschaftInventors: Karl-Heinz Dorr, Ulrich Sander, Alfons Schulte, Heinrich Traulsen
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Patent number: 4533537Abstract: The SO.sub.2 content of gases is catalytically reacted to form SO.sub.3. The SO.sub.3 -containing gases are cooled in a plurality of stages with a cooling fluid (A) before the SO.sub.3 is absorbed. The absorbing acid is cooled by a cooling fluid (B) which delivers heat to a consumer. To increase the temperature of the cooling fluid (B) or to reduce the expenditue and to prevent a temperature drop in the SO.sub.3 -containing gases below the dew point temperature, the SO.sub.3 -containing gases are cooled first by and indirect heat exchange and then by a second indirect heat exchange with a cooling fluid (A) to a temperature slightly above the dew point temperature of the SO.sub.3 -containing gases. The cooling fluid (A) is conducted in a closed cycle. The sulfuric acid circulated through the absorber is cooled by an indirect heat exchange with a liquid cooling fluid (B), which is conducted in a closed cycle.Type: GrantFiled: August 3, 1983Date of Patent: August 6, 1985Assignee: Metallgesellschaft AktiengesellschaftInventors: Heinz Dittmar, Manfred Beckmann, Karl-Heinz Dorr, Ulrich Rothe, Ulrich Sander
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Patent number: 4368183Abstract: SO.sub.2 -containing, hot gases are catalytically converted in part in a first contacting stage. The water and the SO.sub.3 formed is removed from the reaction gas. The remaining gas is heated and then supplied to the second contacting stage. The water vapor content in the reaction gas delivered by a first contacting stage corresponds to an H.sub.2 O/SO.sub.3 mole ratio below 1. The reaction gas delivered by the first contacting stage is precooled by an indirect heat exchange to such a temperature that the wall temperatures of the heat exchanger are above the dew point temperature of the reaction gas. The precooled reaction gas entering a condensing stage is contacted in a venturi with cocurrent sulfuric acid of 98.0 to 100% concentration and a temperature of at least 95.degree. C. The exit temperature of the gas from the condensing stage is maintained at least at 120.degree. C.Type: GrantFiled: November 3, 1980Date of Patent: January 11, 1983Assignees: Metallgesellschaft Aktiengesellschaft, Sudchemie AktiengesellschaftInventors: Karl-Heinz Dorr, Hugo Grimm, Ulrich Sander, Robert Peichl, Franz Maier
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Patent number: 4163047Abstract: A process for the recovery of sulfuric acid from waste sulfuric acid containing iron sulfate and from solid iron sulfate of high water content of crystallization which consists essentially of:A. concentrating waste sulfuric acid to an acid concentration of 25-55 weight percent, based upon the suspension, by removing water therefrom;B. mixing the concentrated acid of Step A with recycled concentrated sulfuric acid obtained from Step E to form a resultant acid mixture of acid concentration of 30-65 weight percent, based upon the suspension;C. adding said solid iron sulfate of high water content of crystallization to the acid mixture of Step B thereby obtaining iron sulfate of low water content of crystallization;D. separating the iron sulfate of low water content from the resultant sulfuric acid solution of Step C;E. concentrating the separated sulfuric acid solution of Step D to an acid concentration of 45-70 weight percent, based on salt-free acid, and recycling at least a portion thereof to Step B; andF.Type: GrantFiled: June 30, 1977Date of Patent: July 31, 1979Assignees: Metallgesellschaft Aktiengesellschaft, Bayer AktiengesellschaftInventors: Karl-Heinz Dorr, Georg Daradimos, Hugo Grimm, Georg Schmidt, Rudolf Gerken, Christoph Mucke, Hermann Wieschen
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Patent number: 4029751Abstract: Sulfuric acid is produced from sulfur trioxide-containing humid gases by a process wherein the sulfur trioxide-containing humid gases are directly cooled with aqueous sulfuric acid, sulfuric acid is condensed and the gas is cooled below dew point of the sulfuric acid, and the water not required to form sulfuric acid is discharged as water vapor with the end gases.Type: GrantFiled: December 29, 1975Date of Patent: June 14, 1977Assignee: Metallgesellschaft AktiengesellschaftInventors: Karl-Heinz Dorr, Hugo Grimm, Waldemar Weber, Michael Tacke, Georg Schmidt
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Patent number: 4023938Abstract: In the removal of water from a gas by contact with sulfuric acid, the improvement which comprises supplying the sulfuric acid in finely divided form having a surface of about 10.sup.4 to 10.sup.7 m.sup.2 /h at a concentration of about 95 to 99% and a temperature of about 35.degree. to 80.degree. C and with a contact time of about 0.2 to 2 seconds, whereby the residual moisture content of the gas is reduced to about 30 to 250 mg of H.sub.2 O/Nm.sup.3. Preferably the sulfuric acid is sprayed through a constriction into a vessel through which the gas is passed. The large sulfuric acid surface area permits high levels of dehydration to be achieved with far less sulfuric acid than heretofore believed possible and with small vessels and minimal contact times. Contact may be effected serially in several stages with the spent acids combined, brought up to initial concentration and recirculated.Type: GrantFiled: April 15, 1975Date of Patent: May 17, 1977Assignees: Bayer Aktiengesellschaft, Metallgesellschaft AktiengesellschaftInventors: Hans Guth, Gerhard Jonas, Klaus Kleine-Weischede, Hermann Wieschen, Hans-Joachim Kaiser, Karl-Heinz Dorr, Hugo Grimm
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Patent number: 4008316Abstract: Process for production of SO.sub.3 by catalytic oxidation of SO.sub.2 which comprises carrying out the oxidation in two stages with intermediate absorption. The conversion of SO.sub.2 in the first stage is about 70-80% for a starting gas which is a cooled and cleaned roaster gas and 70-90% for a starting gas which is a sulfur combustion gas. The second stage comprises two catalyst beds, and the gas is cooled intermediate the beds. High overall conversion is obtained with low catalyst requirement.Type: GrantFiled: July 10, 1972Date of Patent: February 15, 1977Assignee: Metallgesellschaft AktiengesellschaftInventors: Herbert Drechsel, Karl-Heinz Dorr, Hugo Grimm
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Patent number: 3997655Abstract: Gases having a high SO.sub.2 content are catalytically reacted in a contacting zone having a plurality of series-connected contacting trays. A partial stream of partly reacted gases from the contacting zone containing SO.sub.3 is admixed with the SO.sub.2 containing gas before entering the first contacting tray. The gases are subjected to interstage cooling between contacting trays. At least a portion of the partly reacted gases is passed through an absorber prior to mixing with the feed stock gas having a high SO.sub.2 content. The rate at which SO.sub.3 is absorbed is increased in dependence on the loss of catalyst activity in the contacting zones such that the conversion of SO.sub.2 to SO.sub.3 in the contacting trays remains approximately constant.Type: GrantFiled: September 30, 1975Date of Patent: December 14, 1976Assignee: Metallgesellschaft AktiengesellschaftInventors: Lothar Reh, Karl-Heinz Dorr, Hugo Grimm, Karel Vydra
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Patent number: 3988428Abstract: Sulfur dioxide is formed by the combustion of elemental sulfur in two distinct stages wherein oxygen-containing gas in a quantity which is initially less than that stoichiometrically required for total combustion of the sulfur to sulfur dioxide and the sulfur-dioxide gases and residual elemental sulfur are thereupon passed through a heat exchanger and subjected to an afterburning with additional quantities of oxygen-containing gas. 70% to 95% of the total oxygen required for combustion of sulfur is supplied in the initial or combustion stage and the remainder (i.e. 30 to 5%) is supplied in the afterburning stage.Type: GrantFiled: April 12, 1974Date of Patent: October 26, 1976Assignee: Metallgesellschaft AktiengesellschaftInventors: Karl-Heinz Dorr, Siegfried Bielz, Dan Constantinescu, Hubert Vollmer, Rudolf Beuchelt, Hans Guth, Peter Reher, Herman Wieschen
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Patent number: 3963423Abstract: A catalytic reactor for converting sulfur dioxide to sulfur trioxide, suitable for high throughput rates of up to about 500,000 standard cubic meters per hour. The reactor includes a plurality of separate reaction chambers each containing catalyst trays connected in parallel in the gas flow path. The catalyst trays define gas spaces and alternate gas spaces are provided with inlets for supplying a partial stream of the sulfur dioxide containing gases which are divided in the gas spaces. The gas spaces adjacent to the gas spaces provided with inlets are provided with outlets for withdrawing partial streams of the gases which have passed through the catalyst trays.Type: GrantFiled: July 12, 1974Date of Patent: June 15, 1976Assignee: Metallgesellschaft AktiengesellschaftInventors: Karl Heinz Dorr, Waldemar Weber, Hugo Grimm, Gustav Rowedder
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Patent number: 3950493Abstract: A process for removing sulfur trioxide from gases wherein the sulfur trioxide-containing gas is treated with sulfuric acid in a Venturi absorber, the sulfur-trioxide laden sulfuric acid is passed in indirect heat exchange with a cooling fluid within the widening outlet of the absorber and the sulfur trioxide-laden sulfuric acid is separated from the gas phase.Type: GrantFiled: September 23, 1974Date of Patent: April 13, 1976Assignee: Metallgesellschaft AktiengesellschaftInventors: Karl-Heinz Dorr, Lothar Reh, Hugo Grimm, Karel Vydra
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Patent number: 3944401Abstract: Sulfur compounds oxidizable to form sulfuric acid and organic compounds oxidizable to CO.sub.2 and H.sub.2 O are removed from an exhaust gas of a contact-process plant for producing sulfuric acid by treating the exhaust gas with a scrubbing solution consisting of dilute sulfuric acid and peroxydisulfuric acid. The peroxydisulfuric acid is produced electrolytically from fresh dilute sulfuric acid and the resulting electrolyte is continuously introduced into the scrubbing acid cycle. The exhaust gas is treated in a vertical venturi with uniflow, i.e. codirectional flow of the gas and the scrubbing solution, and the gas is then passed through a horizontal venturi and subsequently upwardly through a packing layer.CROSS-REFERENCE TO RELATED APPLICATIONThe present Application is related to the commonly assigned copending application Ser. No. 308,849 filed Nov. 22, 1972 and entitled METHOD OF REMOVING GASEOUS IMPURITIES FROM WASTE GASES now abandoned.Type: GrantFiled: May 6, 1974Date of Patent: March 16, 1976Assignees: Metallgesellschaft Aktiengesellschaft, Sud-Chemie AGInventors: Karl-Heinz Dorr, Hugo Grimm, Ulrich Sander, Robert Peichl, Michael Tacke