Chlorine Or Chlorine Containing Compound Sorbed Patents (Class 95/132)
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Patent number: 6071329Abstract: The filter contains about 1-5% lithium hydroxide and about 85-99% hopcalite material, having a particle size of approximately 20 to 100 mesh, and can be used in combination with a chemical oxygen generator for removing chlorine gas and carbon monoxide.Type: GrantFiled: January 30, 1998Date of Patent: June 6, 2000Assignee: BE Intellectual Property, Inc.Inventors: Yunchang Zhang, Michael J. Brumely, James C. Cannon, John E. Ellison, Girish S. Kshirsagar
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Patent number: 6060033Abstract: The invention relates to a process for removing hydrogen halides from hydrocarbon-containing streams. More particularly, the invention relates to a process and an HCl sorbent for the removal of HCl and other hydrogen halides from hydrocarbon streams to prevent the formation of green oils. The sorbent has an increased capacity for the sorption of HCl and a reduced catalytic activity for the formation of green oils which, surprisingly, results from the pre-loading of water on a sodium promoted alumina adsorbent. The pre-loading of water on the sodium promoted alumina adsorbent in the range of about 5 to about 11 percent of the essentially water-free adsorbent increases the HCl sorption capacities by about 25% with a corresponding decrease in catalytic reactivity.Type: GrantFiled: April 22, 1998Date of Patent: May 9, 2000Assignee: UOP LLCInventor: Linda Shi Cheng
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Patent number: 6027547Abstract: A fluid storage and dispensing system, comprising: a fluid storage and dispensing vessel constructed and arranged for selective dispensing of fluid therefrom; a solid-phase support in the vessel; and an affinity medium on the solid-phase support, wherein the affinity medium reversibly takes up the fluid when contacted therewith, and from which the fluid is disengagable under dispensing conditions. The affinity medium may be a liquid, oil, gel, or solid (porous solid, thin film solid, or bulk solid). The system of the invention may be employed for the storage and dispensing of fluids such as hydride, halide and dopant gases for manufacturing of semiconductor products.Type: GrantFiled: May 18, 1998Date of Patent: February 22, 2000Assignee: Advanced Technology Materials, Inc.Inventors: Glenn M. Tom, Duncan W. Brown
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Patent number: 5985226Abstract: Disclosed is a process for separating chlorine gas from a mixture of gases. The mixture of gases is cooled to a temperature less than 0.degree. C. and is contacted with ice, which results in the formation of chlorine hydrate on the ice. The ice is separated from the mixture of gases and is heated or the operating pressure reduced to release chlorine.Type: GrantFiled: January 7, 1998Date of Patent: November 16, 1999Assignee: Occidental Chemcial CorporationInventors: Robert L. Zeller, Sharon D. Fritts, David L. Johnson, Kenneth J. Carlson, Paul J. Orosz, Ronald B. Kaplin
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Patent number: 5928411Abstract: A device for removing at least laughing gas and anesthetic vapor from a gas sample based on a molecular sieve shall be improved such that it possesses good adsorption properties for both gas components. A molecular sieve arrangement is provided, which is flown through from a gas inlet to a gas outlet and comprises a first molecular sieve area with a first pore size between about 0.3 nm and 0.5 nm and a second molecular sieve area with a second pore size between about 0.8 nm and 1 nm.Type: GrantFiled: July 21, 1997Date of Patent: July 27, 1999Assignee: Dragerwerk AGInventors: Wolfgang Falb, Karl-Ludwig Gippert, Uwe Bausch, Dirk Stefan Reichert, Stefan Linke, Udo Feldhoff
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Patent number: 5895520Abstract: The exhaust gas stream is passed through a bed of a granular adsorbent for separating noxious substances. The bed consists of the mixture of a granular high-carbon material and a granular inert material. The bulk density of the inert material is 0.8 to 3 times the bulk density of the carbonaceous material. Preferably, the content of the high-carbon material in the bed is 5 to 80 wt-%. The high-carbon material may for instance be activated carbon, activated coke or lignite coke. As inert material there may for instance be used siliceous rock, pumice, lava, slag, vitrification residues or fine gravel.Type: GrantFiled: July 22, 1997Date of Patent: April 20, 1999Assignee: Metallgesellschaft AktiengesellschaftInventors: Dietrich Rolke, Volker Hohmann, Hans-Jochen Fell
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Patent number: 5888465Abstract: Disclosed and claimed is a process for selectively separating hydrogen halides from sulfur-dioxide-containing gases by using an adsorbent made from a porous ceramic support material which is impregnated with an alkaline earth metal salt solution and, after evaporation of the solvent, the alkaline earth metal salt is pyrolysed at 200.degree. to 800.degree. C. to give alkaline earth metal oxide .Xh.sub.2 O, where x is a number from 0 to 1.Type: GrantFiled: February 25, 1997Date of Patent: March 30, 1999Assignee: Hoechst AktiengesellschaftInventors: Ulrich Rappold, Wolfgang Schick, Jorg Schmid, Joachim Semel, Heinrich Merten, Matthias Schubert, Gerhard Luft
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Patent number: 5855647Abstract: A process for recovering SF.sub.6 from a gas is provided. The process includes the step of contacting a gas stream comprising SF.sub.6 and at least one of N.sub.2, O.sub.2, CO.sub.2, and H.sub.2 O with a membrane in at least one membrane separation unit at conditions effective to obtain a retentate stream rich in SF.sub.6 and a permeate stream rich in at least one of N.sub.2, O.sub.2, CO.sub.2, and H.sub.2 O.Type: GrantFiled: May 15, 1997Date of Patent: January 5, 1999Assignee: American Air Liquide, Inc.Inventors: Yao-En Li, Magdy Meimari
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Patent number: 5804146Abstract: A chemical oxygen generator with a chemical mass, which is accommodated inside a container, generates oxygen by a chemical reaction, and is held in the container by a gas-permeable fibrous material. The fibrous material is arranged around the chemical mass. The fibrous material is designed as a chemical sorption filter.Type: GrantFiled: March 4, 1997Date of Patent: September 8, 1998Assignee: Dragerwerk AGInventors: Harald Heyer, Udo Burchardt, Rainer Ernst
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Patent number: 5788743Abstract: A process for separating chlorine of high purity from a chlorine-containing feed gas by absorption of the chlorine using an inert absorbent and downstream desorption of the chlorine from the absorbent/chlorine mixture drawn off from the absorption stage by the supply of mixture to a desorption distillation column which is coupled to a chlorine separation column in such a way that the top of the chlorine separation column and an upper section of the desorption distillation column and a lower section of the desorption distillation column and the bottom of the chlorine separation column are connected to one another on both the gas and the liquid side, the absorbent/chlorine mixture being supplied exclusively to the desorption distillation column, and high-purity chlorine being drawn off from a middle region of the chlorine separation column.Type: GrantFiled: September 12, 1996Date of Patent: August 4, 1998Assignee: BASF AktiengesellschaftInventors: Otto Watzenberger, Joachim Pfeffinger
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Patent number: 5650063Abstract: Acidic halides, especially chlorides, are removed from a dry fluid stream by contact with dry particles of solid caustic. The solid caustic particles are preferably non-porous, and disposed as a fluidized bed. Salts deposit on the surface of the caustic and are physically removed, preferably by attrition, to regenerate the surface of the solid caustic. An dry, slightly alkaline salt can be the only product of neutralization. Salt coated beds of solid caustic can also be regenerated for reuse by attrition removal of salt deposits.Type: GrantFiled: December 30, 1994Date of Patent: July 22, 1997Assignee: Mobil Oil CorporationInventor: Tsoung Y. Yan
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Patent number: 5607576Abstract: Acidic halogens, especially chlorides, are removed from a dry gas stream by contact with dry particles of solid caustic. The solid caustic particles are preferably non-porous, and disposed in a bed with at least a 10% bed interstitial volume. Limiting halogen content in gas, and operating with a bone dry gas, ensures that salts deposit on the surface of the solid caustic without plugging the bed of solid caustic. Efficient halogen removal can be achieved even when treating a bone dry gas, one having less than 10 ppmv water vapor, at ambient temperature, without plugging the bed.Type: GrantFiled: December 30, 1994Date of Patent: March 4, 1997Assignee: Mobil Oil CorporationInventor: Tsoung Y. Yan
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Patent number: 5601702Abstract: Acidic halides, especially chlorides, are removed from gas by contact with particles of solid caustic covered by aqueous and hydrocarbon phases, respectively. Effective neutralization is achieved without swelling or plugging the bed of solid caustic. Halides are removed as brine. Efficient caustic utilization is achieved by controlling water vapor levels in the gas based on pH of brine product.Type: GrantFiled: December 30, 1994Date of Patent: February 11, 1997Assignee: Mobil Oil CorporationInventor: Tsoung Y. Yan
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Patent number: 5599456Abstract: A method for treating a fluid or gas containing contaminants wherein the fluid or gas is passed through a contactor having at least one reticulated foam structured fluid treatment element formed from metal particles bound together in an interconnected form and capable of promoting a reduction/oxidation reaction between the contaminants and the reticulated foam structured fluid treatment element. The metal particles employed in the fabrication of the reticulated foam structured fluid treatment element are selected from a group of particles comprising zinc, copper or combinations thereof.Type: GrantFiled: October 11, 1994Date of Patent: February 4, 1997Assignee: Advanced Waste ReductionInventor: Chris E. Fanning
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Patent number: 5587138Abstract: The present invention is directed to a process for preventing the formation of dioxin and/or furan during combustion of composite combustible materials in a combustion chamber. The process includes passing the generated combustion gas in a flow from the combustion chamber to a dedusting device, cooled and purified while maintaining the SO.sub.3 content in the combustion gas flow from about 7 to about 500 mg/m.sup.3 and at a temperature of from about 300 .degree. to about 800.degree. C., The process allows at least surface regions of particles of meal dusts contained in the combustion gas to be converted to sulfates and thereby prevent formation of dioxins and furan. The invention also includes a steam generator for carrying out the process whose steel structures coming into contact with the combustion gases are either alloyed or coated with tungsten and/or vanadium on the combustion-gas side.Type: GrantFiled: April 13, 1995Date of Patent: December 24, 1996Assignee: Austrian Energy & Environment, SGP/Waagner-Biro GmbHInventors: Michael Bobik, Ralf L. Lindbauer, Alfred Glasner
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Patent number: 5531809Abstract: The present invention is an apparatus and method for preferentially adsorbing carbon monoxide from a gas stream containing carbon monoxide in the presence of water and potentially ammonia while not adsorbing methane, hydrogen or carbon dioxide which may be present in the gas stream using an adsorbent of a supported cuprous compound situated downstream serially from a pretreatment adsorbent of 3A zeolite which protects the cuprous compound from water. An additional pretreatment layer of a basic metal compound to protect the acid-unstable 3A zeolite layer is also contemplated.Type: GrantFiled: September 14, 1994Date of Patent: July 2, 1996Assignee: Air Products and Chemicals, Inc.Inventors: Timothy C. Golden, Paul A. Webley, Steven R. Auvil, Wilbur C. Katz
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Patent number: 5514356Abstract: Environmental release of carcinogenic polychlorinated dibenzo-dioxins and polychlorinated dibenzo-furan compounds that typically result from combustion of materials containing chlorine or hydrochloric acid-generating components is minimized by preferential sorption of the precursor reactants on sorbents added to exhaust gas at high temperatures containing such precursors prior to conversion of the precursors to carcinogenic compounds normally occurring as the exhaust gas is cooled.Type: GrantFiled: March 7, 1995Date of Patent: May 7, 1996Assignee: Beco Engineering CompanyInventor: Bernard J. Lerner
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Patent number: 5500035Abstract: A process is provided for the removal and recovery of chlorine from a chlorine plant offgas stream. A pressure swing adsorption (PSA) process is used to remove from the chlorine plant offgas a vent gas stream comprising hydrogen and a tail gas stream comprising chlorine which is subsequently liquefied. The PSA zone comprises at least 2 adsorption beds, wherein each of the adsorption beds contains a weak adsorbent selective for the adsorption of chlorine and the PSA process is operated with a short cycle having an adsorption time of less than about 6 minutes. The vent gas withdrawn from the process is essentially free of chlorine and a liquefied chlorine product is recovered. The process provides an economic and efficient way of removing chlorine from a chlorine plant offgas stream without requiring a vacuum pump or heat removal equipment.Type: GrantFiled: July 19, 1994Date of Patent: March 19, 1996Assignee: UOPInventors: Andrew S. Zarchy, Chien C. Chao, Richard T. Maurer
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Patent number: 5482536Abstract: An apparatus for containing and scrubbing toxic or corrosive gases from a leaking pipe or cylinder is provided. A gas passageway attaches at one end to a leakage location on a pipe or cylinder, and at the other end to an air operated exhauster. The air operated exhauster, through the input of a non-flammable purge gas, creates an exhaust flow from the leakage location to a drum which is attached to the air operated exhauster. The drum contains a scrubbing media which, when it contacts the leaked gas, cleans or removes the harmful component, thus allowing release to the atmosphere of the cleaned air.Type: GrantFiled: April 12, 1994Date of Patent: January 9, 1996Assignee: Solvay Specialty Chemicals, Inc.Inventors: Eugene Y. Ngai, Lester S. Gerver
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Patent number: 5453113Abstract: The present invention provides a process for the recovery of methyl chloride from a mixture thereof with isobutane. The process employs pressure swing adsorption with a size selective adsorbent having a pore opening of between about 3.7.times.3.7 Angstroms and about 4.9.times.5.7 Angstroms, such as zeolite A, clinoptilolite and mixtures thereof to selectively adsorb methyl chloride from vent streams comprising methyl chloride and isobutane and recovering a tail gas stream enriched in methyl chloride. The process may be used in applications such as treating the vent gas streams from the direct synthesis of methyl chlorosilanes. The process provides an economical route to recovering a valuable raw material in the process of making silicones and reduces the volume and methyl chloride content of the vent stream which is typically incinerated to avoid the release of halogenated hydrocarbons to the atmosphere.Type: GrantFiled: April 11, 1994Date of Patent: September 26, 1995Assignee: UOPInventors: Andrew S. Zarchy, Richard T. Maurer, Chen C. Chao
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Patent number: 5405431Abstract: In a continuous adsorption process using dual towers for separation of a multi-component feed with one tower active and the other on regeneration, automatic switching of the tower feed based on loading of a hydrogen fluoride (HF) component in the active tower is achieved by inferring HF loading based on concentration measurement of acid soluble oil (ASO). An optimum switching point, which switches tower feed near full HF capacity of the active tower but before HF breakthrough occurs, is based on calculating a second derivative for a concentration vs. time curve of ASO in the active bed effluent.Type: GrantFiled: October 4, 1993Date of Patent: April 11, 1995Assignee: Phillips Petroleum CompanyInventor: Alan D. Eastman
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Patent number: 5380500Abstract: A process and apparatus for the separation of vaporous heavy metal compounds from a carrier gas wherein the heavy metal compounds are cooled and desublimed. An apparatus for carrying out this process has a melting furnace with a discharge opening for a gas/vapor mixture, which leads to a cooling device. Vaporous heavy metal compounds can be separated from a carrier gas on a large industrial scale. In addition, the apparatus for carrying out this process is easy to operate. The gas/vapor mixture is turbulently mixed immediately after the discharge from the furnace in a mixing section with cold air and is thus cooled. During this cooling, the vaporous heavy metal compounds desublime and are filtered as particles in a filter.Type: GrantFiled: November 12, 1993Date of Patent: January 10, 1995Assignee: ABB Gadelius KKInventors: Michael Hirth, Joachim Jochum, Harald Jodeit, Christian Wieckert
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Patent number: 5376164Abstract: A process is provided for the removal and recovery of chlorine from a chlorine plant offgas stream. A pressure swing adsorption (PSA) process is used to remove from the chlorine plant offgas a vent gas stream comprising hydrogen and a tail gas stream comprising chlorine which is subsequently liquefied. The PSA zone comprises at least 2 adsorption beds, wherein each of the adsorption beds comprises a first adsorption layer and at least a second adsorption layer. The first adsorption layer contains a weak adsorbent selective for the adsorption of chlorine and has a large pore structure with 12 member rings or more. The second adsorption layer contains a strong adsorbent selective for the adsorption of chlorine and has a small pore structure with 10 member rings, or less. The vent gas withdrawn from the process is essentially free of chlorine.Type: GrantFiled: August 9, 1993Date of Patent: December 27, 1994Assignee: UOPInventors: Andrew S. Zarchy, Chien C. Chao, Richard T. Maurer
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Patent number: 5370833Abstract: A process produces fibers from polymers which give off troublesome gases and/or vapors during spinning, comprising the steps of:a) extruding the molten polymer through a spinneret into a closed spinning shaft,b) quenching the resulting filaments in the spinning shaft with a gas,c) taking off the resulting filaments from the spinning shaft,d) conducting the quench gas away from the spinning shaft and introducing it into a gas purification system ande) purifying the used quench gas by contact with an adsorbent for said troublesome gases and/or vapors.It is possible by the present invention to keep hazardous gases occurring during the spinning of polymers away from the surroundings and to dispose of them. Suitable polymers are in particular polyphenylene sulfides.Type: GrantFiled: July 26, 1993Date of Patent: December 6, 1994Assignee: Hoechst AktiengesellschaftInventors: Herbert Wellenhofer, Gerhard Leumer, Andreas Fischer, Diethelm Rabe, Hans-Jurgen Profe
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Patent number: 5302187Abstract: Disclosed herein is a process comprising introducing a chlorine-containing gas through an adsorbent to adsorb chlorine and thereafter reducing the pressure of the adsorbent to a pressure lower than that during the introduction, thereby obtaining an effluent gas with a higher chlorine concentration than that of the introduced gas. Among preferably usable adsorbents are zeolite, non-zeolite-type porous acidic oxides and active carbon.Type: GrantFiled: November 12, 1992Date of Patent: April 12, 1994Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Hiroyuki Itoh, Yoshitsugu Kono, Shinji Takenaka, Yukihiro Yoshikawa, Isao Kikuchi, Teruo Hirayama
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Patent number: 5298227Abstract: A process and apparatus for the separation of vaporous heavy metal compounds from a carrier gas wherein the heavy metal compounds are cooled and desublimed. An apparatus for carrying out this process has a melting furnace with a discharge opening for a gas/ vapor mixture, which leads to a cooling device.Vaporous heavy metal compounds can be separated from a carrier gas on a large industrial scale. In addition, the apparatus for carrying out this process is easy to operate. The gas/vapor mixture is turbulently mixed immediately after the discharge from the furnace in a mixing section with cold air and is thus cooled. During this cooling, the vaporous heavy metal compounds desublime and are filtered as particles in a filter.Type: GrantFiled: August 18, 1989Date of Patent: March 29, 1994Assignee: Asea Brown Boveri Ltd.Inventors: Michael Hirth, Joachim Jochum, Harald Jodeit, Christian Wieckert
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Patent number: 5296017Abstract: A method and an apparatus for concentrating/purifying a chlorine gas are disclosed in which a pressure swing adsorption method for alternately repeating an adsorbing operation and a desorbing operation employing one or more adsorption towers packed with an adsorbent for adsorbing the chlorine gas are used to obtain a high-purity concentrated/purified chlorine gas and an exhaust gas containing virtually no chlorine gas is obtained from the chlorine gas containing impurities by terminating the adsorption operation when the rate of temperature rise near the outlet end of an adsorption tower due to adsorption of chlorine therein rises above a predetermined amount.Type: GrantFiled: May 27, 1992Date of Patent: March 22, 1994Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Yoshitsugu Kono, Masaaki Ura, Hiroyuki Itoh, Satoshi Tsuruda
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Patent number: 5282886Abstract: A mixed gas is contacted with a non-carbonaceous adsorbent while irradiating the adsorbent with an electromagnetic wave having a frequency of 1 MHz to 25 GHz, such as a microwave, so that a gas component having a smaller coefficient of dielectric loss is selectively adsorbed by the adsorbent. A gas adsorbed on an adsorbent may be desorbed therefrom by contact with a desorbing gas while irradiating the adsorbent with the above electromagnetic wave.Type: GrantFiled: September 9, 1992Date of Patent: February 1, 1994Assignee: Director-General of Agency of Industrial Science and TechnologyInventors: Satoru Kobayashi, Koichi Mizuno, Satoshi Kushiyama, Reiji Aizawa, Yutaka Koinuma, Hideo Ohuchi