Temperature Control Patents (Class 423/DIG6)
  • Patent number: 6113874
    Abstract: A furnace is provided having at least two regenerator beds for heat recovery. While a first bed is being heated by hot flue gases produced by combusting a fuel and an oxidant in the furnace, a second bed, heated during a previous cycle, is cooled through carrying out an endothermic chemical reaction therein, for example the reforming reaction of a hydrocarbon with water vapor and carbon dioxide and/or the dissociation of a hydrocarbon. Once the second bed is cooled by the endothermic reaction, the hot flue gases are redirected to it while the first bed, now hot, is used for carrying out the endothermic chemical reaction. Thereafter the cycle is repeated.
    Type: Grant
    Filed: April 29, 1998
    Date of Patent: September 5, 2000
    Assignee: Praxair Technology, Inc.
    Inventor: Hisashi Kobayashi
  • Patent number: 6017507
    Abstract: A process is provided for reducing the amount of hydrogen sulfide present in a tail gas from a sulfur recovery process. The hydrogen sulfide contaminated gas along with a gas containing free oxygen is passed through a series of hydrogen sulfide oxidation zones containing an oxidation catalyst, such as one or more oxides or salts of Ni, Co, Fe, Cu, Ag, Mn, Mo, Cr, W and V, deposited on a support, such as bauxite, activated alumina, titania and activated carbon. The initial and intermediate catalyst beds are operated adiabatically by injecting a substoichiometric amount of oxygen into the gas to be treated with respect to the amount of hydrogen sulfide present in the gas so that the temperature does not exceed 150.degree. C. The final catalyst bed is operated under conditions such that a superstoichiometric amount of oxygen is injected into the gas with respect to the hydrogen sulfide and cooling is provided so that the temperature does not exceed 150.degree. C.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: January 25, 2000
    Assignee: Elf Aquitaine Productiion
    Inventors: Jean Nougayrede, Andre Philippe, Sabine Savin-Poncet
  • Patent number: 5854079
    Abstract: A method for detection of the performance reduction of an exhaust gas purification catalyst used for reducing the concentration(s) of combustible components or (and) nitrogen oxides all present in an exhaust gas, which method detects a reduction in the heat amount E.sub.g generated from the exhaust gas by the reaction of the exhaust gas catalyzed by the catalyst, or a reduction in the cumulative heat amount generated from the exhaust gas by said reaction in a predetermined temperature range taken by the catalyst during its temperature increase. This method can detect the performance reduction of the catalyst accurately without conducting constant-speed vehicle running for a long time.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: December 29, 1998
    Assignee: NGK Insulators, Ltd.
    Inventor: Nobuhide Kato
  • Patent number: 5741475
    Abstract: A catalytic reaction apparatus includes a catalytic reaction vessel containing a catalyst for an exothermic reaction. First and second catalyst regions contain a catalyst and have different catalytic performances from one another. At least two raw materials are introduced in the catalytic reaction vessel and passed through the first and second catalyst regions to react to generate heat. The heat is transferred to a heat medium arranged outside and contacting the catalytic reaction vessel so that distribution of temperature is controlled in the catalytic reaction vessel. The difference in catalytic performance is achieved by controlling concentration of the catalyst or by using different catalyst species.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: April 21, 1998
    Assignee: Agency of Industrial Science & Technology
    Inventors: Takumi Takashima, Tadayoshi Tanaka, Takahiro Fujii, Takuya Doi
  • Patent number: 5676922
    Abstract: A faulty chemical reactor in a chemical plant is removed, heat exchange is conducted between the faulty chemical reactor and a new chemical reactor with which the faulty chemical reactor is to be replaced, and then the new chemical reactor is installed at the position from which the faulty chemical reactor was previously removed.
    Type: Grant
    Filed: October 4, 1996
    Date of Patent: October 14, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Shigeaki Namba, Shoji Takahashi, Toshiki Kahara, Nobuhiro Seiki
  • Patent number: 5670121
    Abstract: This invention relates to a process for controlling the temperature of a fluidized bed reactor in the manufacture of titanium tetrachloride, wherein an exhaust gas stream comprising carbonyl sulfide, sulfur dioxide, carbon monoxide, carbon dioxide, and chlorine is formed. In the process, the exhaust gas stream is first analyzed to determine the analyzed concentration of carbonyl sulfide (or concentration ratio of carbonyl sulfide to sulfur dioxide), the desired concentration of carbonyl sulfide (or concentration ratio of carbonyl sulfide to sulfur dioxide) in the exhaust gas stream is determined, and the difference between the analyzed concentration of carbonyl sulfide (or concentration ratio of carbonyl sulfide to sulfur dioxide) and the desired concentration of carbonyl sulfide (or concentration ratio of carbonyl sulfide to sulfur dioxide) in the exhaust gas stream is then calculated.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: September 23, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Thomas Shields Elkins
  • Patent number: 5560891
    Abstract: A catalytic reaction apparatus for carrying out an exothermic catalytic reaction includes a first vessel for containing a first raw material for the exothermic catalytic reaction; a second vessel for containing a second raw material for the exothermic catalytic reaction; a reaction vessel for carrying out therein the exothermic catalytic reaction which is connected to the first and second vessels and receives the first and second raw materials for the exothermic catalytic reaction, the reaction vessel having first and second regions respectively containing first and second catalysts having respective activities different from each other so that the first and second regions have different catalytic performances from one another; a first heat exchanger associated with the reaction vessel and containing a heating medium flowing through the first heat exchanger so that the heating medium receives heat generated by the exothermic reaction in the reaction vessel; a third vessel connected to the first heat exchanger
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: October 1, 1996
    Assignee: Agency of Industrial Science and Technology
    Inventors: Takumi Takashima, Tadayoshi Tanaka, Takahiro Fujii, Takuya Doi
  • Patent number: 5500195
    Abstract: A method for reducing gaseous emission of halogen compounds in a fluidized bed reactor in which the fine particles entrained in flue gases are used to form a temporary layer of particles on the baghouse filter to absorb halogen gases.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: March 19, 1996
    Assignee: Foster Wheeler Energy Corporation
    Inventor: Juan A. Garcia-Mallol
  • Patent number: 5366719
    Abstract: This invention relates to a method of conducting a chemical reaction in the presence of a heterogeneous catalyst, in which a feedstock is passed through a catalytic reactor, said reactor comprising a solid reactor bed with a catalytically active material present thereon, and at least one heat supplying and/or discharging reactor wall, and in which the catalyst bed consists of elementary particles of material sintered together and to one side of the wall, there being no sintered material present on the other side of the reactor wall, and in which the maximum distance in meters (x.sub.
    Type: Grant
    Filed: August 17, 1993
    Date of Patent: November 22, 1994
    Assignee: Veg-Gasinstituut N.V.
    Inventors: Antonius J. M. van Wingerden, Andries Q. M. Boon, John W. Geus
  • Patent number: 5261602
    Abstract: A partial oxidation process and a novel burner are provided for simultaneously introducing two or three separate feedstreams into a free-flow partial oxidation gas generator for the production of synthesis gas and fuel gas, or reducing gas. The reactant feedstreams include a liquid hydrocarbonaceous fuel or a pumpable slurry of solid carbonaceous fuel, and a free-oxygen containing gas e.g. air or oxygen. The burner comprises a central conduit and a plurality of spaced concentric coaxial conduits with down-flowing annular passages. A flat annular-shaped disc or cup-shaped porous ceramic or porous metal cooling means of uniform composition, wall thickness and porosity with the various pores interconnecting is attached to the downstream tip of the burner. A controlled amount of liquid coolant under pressure is passed successively through the porous inside surface, porous core and porous outside surface of the cooling means is vaporized. The tip of the burner is thereby cooled.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: November 16, 1993
    Assignee: Texaco Inc.
    Inventors: Albert Brent, Robert J. Stellaccio, Mitri S. Najjar, Jerrold S. Kassman
  • Patent number: 5145658
    Abstract: A process and apparatus is disclosed for reclaiming of heat of reaction energy from an alkaline scrubbing solution used in acid gas removal processes and apparatus therefor. The heat recovered is used to produce steam which may then be employed to assist in steam stripping the rich scrubbing solution to effect regeneration thereof. The rich scrubbing solution containing heat of reaction thermal energy is passed through a rich-reflux reboiler to recover a part of the energy to produce at least a part of the stripping steam, and then through a rich-lean reboiler under a reduced pressure to produce additional quantities of stripping steam. A reduction in steam requirements for regeneration of the rich alkaline scrubbing agent of at least 10% is thereby realized.
    Type: Grant
    Filed: September 6, 1991
    Date of Patent: September 8, 1992
    Assignee: Eickmeyer & Associates, Inc.
    Inventor: I-Meen Chao
  • Patent number: 5085839
    Abstract: An improved acid gas recovery system is provided which has particular application in reducing the incidence of sulfide and other acid gas excursions. The present invention addresses the disadvantages of prior absorption techniques by closely monitoring and maintaining a reaction zone temperature profile within a contactor to improve and control the reaction between acid gas components and the aqueous amine absorbent. The temperature profile is maintained by frequently adjusting relative flow rates of the feed gas and lean amine in the process which in turn reduces the incidence of excursions.
    Type: Grant
    Filed: April 23, 1991
    Date of Patent: February 4, 1992
    Assignee: Lyondell Petrochemical Company
    Inventors: David E. Scott, Phillip Celaya, Brent A. McCune, Tom A. Wellborn
  • Patent number: 5063040
    Abstract: A method for increasing the trichlorosilane yield in the hydrochlorination of silicon in a fluidized bed involves chilling the gas mixture issuing from the fluidized bed in the shortest possible time immediately after leaving the fluidized bed to temperatures below 550.degree. C. When the temperature of the fluidized bed is below 550.degree. C., the gas mixture is chilled to temperature 100.degree. C. lower than the reaction temperature in the fluidized bed. The method makes it possible, at a reaction temperature of, for example, 800.degree. C. to increase the 16 to 20% trichlorosilane yields obtained formerly at this temperature to 55%, especially when gaseous silicon tetrachloride is also added to the fluidized bed.
    Type: Grant
    Filed: January 23, 1990
    Date of Patent: November 5, 1991
    Assignee: Huels Aktiengesellschaft
    Inventor: Klaus Ruff
  • Patent number: 4849194
    Abstract: The crystallization of a crystalline silicate product from an crystallization mixture is monitored by measuring the specific electrical conductivity of the mixture. The crystallization of metallosilicates, such as aluminosilicate zeolites, may be monitored in this way. Measurement of the electrical conductivity of the crystallization mixture may be carried out on line in a batch or continuous crystallization process. In a continuous process the conductivity may be monitored and used to control the crystallization process parameters in order to achieve a desired degree of crystallinity in the product.
    Type: Grant
    Filed: October 19, 1988
    Date of Patent: July 18, 1989
    Assignee: Mobil Oil Corporation
    Inventors: Sowmithri Krishnamurthy, Donald J. Klocke
  • Patent number: 4847061
    Abstract: A continuous method for preparing silane and a co-product by reacting a metal hydride such as NaAlH.sub.4 with a silicon halide such as SiF.sub.4. The method involves a reactor loop comprising a primary reactor, a secondary reactor and a separation zone. Most of the metal hydride is reacted in the first reactor to which it is added in a substantially constant rate. The remainder of the hydride is reacted in the secondary reactor, in which all or substantially all of the silicon halide is added. The rate of silicon halide addition is governed by feed back from the reaction in the secondary reactor, (.rarw.T so that stoichiometric or substantially stoichiometric operation is achieved. This conserves resources, provides improved co-product and reduces costs.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: July 11, 1989
    Assignee: Ethyl Corporation
    Inventors: Joseph A. Bossier, III, Douglas M. Richards, Lloyd T. Crasto
  • Patent number: 4797199
    Abstract: A cooling fluid is utilized to withdraw heat from a KOH treater. The passing of the cooling fluid in heat exchange with the KOH treater is controlled so as to maintain desired operating pressures and also substantially maximize heat transfer. Bypassing of the feed around the KOH treater is utilized only if sufficient cooling cannot be provided to prevent a temperature runaway.
    Type: Grant
    Filed: March 21, 1985
    Date of Patent: January 10, 1989
    Assignee: Phillips Petroleum Company
    Inventor: Joe B. Hampton
  • Patent number: 4738835
    Abstract: A method of recovering alkaline chemicals from a material containing sodium or potassium compounds. The material is gasified by an external heat source after which the gas is rapidly cooled by arranging it to contact with cooled solid particles separated from the gas.
    Type: Grant
    Filed: December 16, 1986
    Date of Patent: April 19, 1988
    Assignee: A. Ahlstrom Corporation
    Inventor: Erkki J. Kiiskila
  • Patent number: 4724135
    Abstract: The process of producing high surface area mixed metal oxides comprising selecting a precursor characterized by the following formula:A.sub.x M.sub.a [M'(CN).sub.c ].sub.b.nH.sub.2 Ox=0-4;a=0-4;b=0.1-4;c=4-8;n=0-30;A=alkali, alkaline earth metal, Al, Si or mixtures;M=rare earth metals, transition metals or mixture thereof; andM'=transition metal capable of forming a cyanide (e.g. Group VIA-VIII A) or mixture thereof,and heating the precursor at a temperature rate of below 1.degree.C/minute in a controlled atmosphere consisting essentially of O.sub.2 and an inert gas to a temperature sufficient to decompose the precursor and produce the mixed metal oxide.
    Type: Grant
    Filed: October 23, 1986
    Date of Patent: February 9, 1988
    Assignee: The Standard Oil Company
    Inventors: Larry M. Cirjak, Richard P. Schmidt, Jr.
  • Patent number: 4711771
    Abstract: The invention relates to the compression of a gaseous stream 1. The stream 1 is cooled by a liquid 15 that evaporates at least partially in the gaseous stream. The injected liquid has a composition different from that of the gas to be compressed, and is a component employed in the process in which compression is required and conducted. Alternatively, the liquid is selected from the starting materials to be employed in the process.
    Type: Grant
    Filed: March 16, 1984
    Date of Patent: December 8, 1987
    Assignee: Linde Aktiengesellschaft
    Inventor: Helmut Schiller
  • Patent number: 4707350
    Abstract: The invention relates to a process for the decarbonation of minerals, in powdered form, in a fluidized bed. For example, the process applies to the production of quick lime and/or magnesia from lime stone and/or dolomite fines which are not rendered sufficiently valuable at present.The process comprises recycling a portion at least of the carbon dioxide produced to be used as sole fluidizing gas, the fluidized bed being heated to the desired decarbonation temperature by direct heat supply within the fluidized bed by means of electric devices.Production of decarbonated minerals and of CO.sub.2.
    Type: Grant
    Filed: September 24, 1985
    Date of Patent: November 17, 1987
    Assignee: Electricite de France - Service National
    Inventors: Francois Baudequin, Patrick Leclere
  • Patent number: 4552747
    Abstract: A process and system are set forth for improving an oxygen-enriched Claus plant by recycling effluent from the first condenser back to the reaction furnace to moderate oxygen induced high temperatures and thus allow additional oxygen-enrichment and attendant throughput in the Claus plant.
    Type: Grant
    Filed: June 20, 1984
    Date of Patent: November 12, 1985
    Assignees: GAA Engineered Systems, Inc., Air Products and Chemicals, Inc.
    Inventor: B. Gene Goar
  • Patent number: 4478808
    Abstract: A method of preparing sulphur trioxide by the oxidation of sulphur dioxide contained in a reaction mixture in a stationary catalyst bed wherein the direction of the movement of the reaction mixture flow along the catalyst bed is reversed periodically each 10-200 minutes, or the temperature of said reaction mixture is changed in front of the catalyst bed from a temperature of 20.degree.-200.degree. C. to a temperature of 350.degree.-600.degree. C. each 10-200 minutes.
    Type: Grant
    Filed: December 24, 1981
    Date of Patent: October 23, 1984
    Assignee: Institut Kataliza Sibirskogo Otdelenia Akademii Nauk SSSR
    Inventors: Jury S. Matros, Georgy K. Boreskov, Viktor S. Lakhmostov, Viktor J. Volkov, Alexei A. Ivanov
  • Patent number: 4351646
    Abstract: Carbon monoxide-containing gas streams are converted to methane by a cyclic, essentially two-step process in which said carbon monoxide is disproportionated to form carbon dioxide and active surface carbon deposited on the surface of a catalyst, and said carbon is reacted with steam to form product methane and by-product carbon dioxide. The exothermic heat of reaction generated in each step is effectively removed during each complete cycle so as to avoid a build up of heat from cycle-to-cycle, with particularly advantageous techniques being employed for fixed bed, tubular and fluidized bed reactor operations.
    Type: Grant
    Filed: June 12, 1980
    Date of Patent: September 28, 1982
    Assignee: Union Carbide Corporation
    Inventors: Albert C. Frost, Chang-lee Yang
  • Patent number: 4345915
    Abstract: In the preparation of the gaseous reactant feed to undergo a chemical reaction requiring the presence of steam, the efficiency of overall power utilization is improved by premixing the gaseous reactant feed with water and then heating to evaporate the water in the presence of the gaseous reactant feed, the heating fluid utilized being at a temperature below the boiling point of water at the pressure in the volume where the evaporation occurs.
    Type: Grant
    Filed: November 2, 1977
    Date of Patent: August 24, 1982
    Assignee: General Electric Company
    Inventors: Himanshu B. Vakil, Philip G. Kosky
  • Patent number: 4212817
    Abstract: Highly exothermic continuous chemical reactions such as the methanization of carbon oxides are cooled by indirect heat exchange with a liquid coolant such as water, thereby converting at least some of the liquid to a vapor such as steam. When the reaction temperature, because of operational difficulties or the like, exceeds the design temperature of the reaction, said vapor such as steam is passed into the reaction chamber. In this way, the reaction stream is cooled as well as diluted; in addition, since the vapor is preferably selected to be a reaction product, the extent and rate of the exothermic reaction are diminished.
    Type: Grant
    Filed: June 19, 1975
    Date of Patent: July 15, 1980
    Assignee: Linde Aktiengesellschaft
    Inventors: Herbert Schmid, Helmut Schneider, Allan Watson
  • Patent number: 4076796
    Abstract: Endothermic processes are carried out in a fluidized-bed reactor which is connected to a holding reactor, solids being recirculated between the two reactors. The primary fluidized-bed reactor uses a fast-fluidized bed system in which the solids concentration decreases continuously from the bottom to the top of the reactor. After the necessary residence time in the holding reactor, solids are discharged. Solids are entrained with the gas stream from the primary reactor and are separated therefrom to be delivered to the holding reactor. The reaction is controlled by regulating the rate of recirculation of solids from the holding reactor to the fast fluidized bed reactor.
    Type: Grant
    Filed: May 27, 1976
    Date of Patent: February 28, 1978
    Assignee: Metallgesellschaft Aktiengesellschaft
    Inventors: Lothar Reh, Hans-Werner Schmidt, Ludolf Plass