Reacting With Oxiding Gas Patents (Class 423/613)
  • Patent number: 10685860
    Abstract: There is provided a first substrate having a first main surface, a second substrate having a second main surface, a bonding member bonding the first main surface and the second main surface, and a flow path positioned between the first substrate and the second substrate and extended in a parallel direction with the first main surface and the second main surface, and the bonding member has a projection which is protruded from a portion between the first main surface and the second main surface toward an inner part of the flow path, the flow path includes a first portion having the projection provided in an inner part and a second portion linked to the first portion adjacently to an opposite side to a side where the projection of the first portion is provided, and a height of the first substrate is greater than a height of the second portion in the thickness direction.
    Type: Grant
    Filed: November 28, 2014
    Date of Patent: June 16, 2020
    Assignee: KYOCERA Corporation
    Inventor: Tomoyuki Inoue
  • Patent number: 10464021
    Abstract: Embodiments described herein relate to methods and systems for dewatering solutions via forward osmosis.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: November 5, 2019
    Assignee: Porifera, Inc.
    Inventors: Charles Benton, Erik Desormeaux, Olgica Bakajin
  • Patent number: 9617166
    Abstract: An object of the present invention is to provide a method for producing metal oxide particles, in which metal oxide particles with high photocatalytic activity is produced, and a production apparatus therefor. The above object can be achieved by using a method for producing metal oxide particles, which includes subjecting a reaction gas containing metal chloride and an oxidizing gas containing no metal chloride in a reaction tube (11) to preheating, and then subjecting a combined gas composed of the reaction gas and the oxidizing gas to main heating in a main heating region (A) apart from the downstream side of the junction (5b), wherein the time until the combined gas from the junction (5b) arrives at the upstream end (A1) of the main heating region (A) is adjusted to be less than 25 milliseconds.
    Type: Grant
    Filed: August 3, 2010
    Date of Patent: April 11, 2017
    Assignees: National University Corporation Hokkaido University, SHOWA DENKO K.K.
    Inventors: Bunsho Ohtani, Noriyuki Sugishita, Yasushi Kuroda
  • Patent number: 9588034
    Abstract: An apparatus and method for performing permeation testing on materials used in personal protective equipment is described. Two or more test cells are loaded with swatches of material and inserted into the testing apparatus. Chemicals to be tested on the material are loaded into one or more syringes and may be introduced into the top of the test cells as a liquid or a vapor. Vapor is collected from the bottom of the test cells, underneath the swatches of material, and tested for concentration of the chemicals being tested. The apparatus and method facilitates instantaneous breakthrough analysis, control of the sample environment and ease of operator use and calibration.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: March 7, 2017
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Russell A. Bonsteel, Wesley D. Ercanbrack, Christopher A. Bailey, Kenneth D Nemelka, Nathan L. Porter, Michael B. DeZearn
  • Patent number: 9352965
    Abstract: There is provided a method and an apparatus for producing metal oxide particles, which produce metal oxide particles having a high photocatalytic activity with high yield.
    Type: Grant
    Filed: March 7, 2011
    Date of Patent: May 31, 2016
    Assignees: NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY, SHOWA DENKO K.K.
    Inventors: Bunsho Ohtani, Noriyuki Sugishita, Yasushi Kuroda
  • Patent number: 9163299
    Abstract: A device for producing titanium metal comprises (a) a first heating unit that heats and gasifies magnesium and a first channel that feeds the gaseous magnesium, (b) a second heating unit that heats and gasifies titanium tetrachloride so as to have a temperature of at least 1600° C. and a second channel that feeds the gaseous titanium tetrachloride, (c) a venturi section at which the second channel communicates with an entrance channel, the first channel merges into a throat and as a result the magnesium and the titanium tetrachloride combine in the throat and a mixed gas is formed in the exit channel, and in which the temperature of the throat and the exit channel is regulated to be at least 1600° C., (d) a titanium metal deposition unit that communicates with the exit channel and has a substrate for deposition with a temperature in the range of 715-1500° C., and (e) a mixed gas discharge channel that communicates with the titanium metal deposition unit.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: October 20, 2015
    Assignees: HITACHI METALS, LTD., TEKNA PLASMA SYSTEMS INC.
    Inventors: Maher I. Boulos, Jiayin Guo, Jerzy Jurewicz, Gang Han, Shujiroh Uesaka, Tatsuya Shoji
  • Patent number: 8791044
    Abstract: Methods for preparing and using a photocatalyst are described. The catalyst is prepared by oxidation of a metal salt which has been doped in situ to form a photocatalyst active in visible light. The photocatalyst is used for degrading toxic and irritating compounds and infectious agents.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: July 29, 2014
    Assignee: The United States of America as Represented by the Administrator of the U.S. Environmental Protection Agency
    Inventors: Rajender S. Varma, Babita Baruwati, Jurate Virkutyte
  • Patent number: 8741257
    Abstract: This disclosure relates to a process for producing titanium dioxide, comprising: a) reacting a alloy comprising silicon and aluminum having a melting point of about 482° C. to about 660° C., with chlorine gas at temperatures above 190° C. to form chlorides of silicon and aluminum; b) adding titanium tetrachloride to the chlorides of silicon and aluminum of step (a); c) oxidizing the chlorides of silicon and aluminum and titanium tetrachloride of step (b); and d) forming titanium dioxide.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: June 3, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Charles David Musick, Kenneth Paul Klein
  • Patent number: 8734756
    Abstract: A process for producing titanium dioxide, comprising: a) reacting an alloy comprising a metal selected from the group consisting of aluminum, titanium and mixtures thereof, wherein one metal is a major component of the alloy, and an element, with chlorine gas to form chlorides of aluminum, titanium or mixtures thereof and chlorides of the element, at or above the boiling point of the chloride of the major component of the alloy; with the proviso that the element does not comprise Ti when the metal is Ti and does not comprise Al when the metal is Al; (b) adding titanium tetrachloride to the chlorides formed in step (a); (c) oxidizing the chlorides formed in step (a), and titanium tetrachloride of step (b); and (d) forming titanium dioxide.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: May 27, 2014
    Assignee: E I Du Pont de Nemours and Company
    Inventors: John Davis Bolt, Eugene Michael McCarron, III, Charles David Musick
  • Patent number: 8734755
    Abstract: This disclosure relates to a process for producing titanium dioxide, comprising: reacting aluminum and an alloy comprising silicon and titanium having a silicon content of at least 5%, based on the weight of the ahoy, with chlorine gas at temperatures above 190° C. to form chlorides of silicon, aluminum and titanium; adding titanium tetrachloride to the chlorides of silicon, aluminum and titanium; oxidizing the chlorides of silicon, aluminum and titanium and titanium tetrachloride; and forming titanium dioxide.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: May 27, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventor: Charles David Musick
  • Patent number: 8679449
    Abstract: Provided is a method for producing decahedral titanium oxide particles, wherein the decahedral titanium oxide particles are produced by allowing a reaction gas containing titanium tetrachloride to flow into a reaction pipe having a partial double-pipe structure in which a hollow internal cylinder is inserted into an upstream portion of a hollow external cylinder, the method comprising: performing a preheating on the reaction gas containing titanium tetrachloride and a barrier gas not containing metal chlorides in a region on the upstream side of a downstream end of the hollow internal cylinder, while allowing the reaction gas to flow into the hollow internal cylinder and the barrier gas to flow between the hollow internal cylinder and the hollow external cylinder; and performing a main heating on the reaction gas in a downstream region apart from the downstream end of the hollow internal cylinder to thermally decompose the titanium tetrachloride.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: March 25, 2014
    Assignees: National University Corporation Hokkaido University, Showa Denko K.K.
    Inventors: Bunsho Ohtani, Yasushi Kuroda, Noriyuki Sugishita
  • Patent number: 8480999
    Abstract: The manufacture of titanium dioxide by oxidation of titanium tetrachloride in a plug flow reactor, wherein the titanium tetrachloride is introduced into the reactor in at least two stages and is used exclusively in liquid form. The total quantity of liquid TiCl4 used is split up in several stages. A small quantity is added in the first stage in order to start combustion despite using the liquid phase. In the first phase, the activation energy required is provided solely via the preheated oxygen. In all other stages, the activation energy is provided by the preheated oxygen and the reaction enthalpy of TiCl4 oxidation released in the upstream stages.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: July 9, 2013
    Assignee: Kronos International, Inc.
    Inventor: Rainer Gruber
  • Publication number: 20130058860
    Abstract: The manufacture of titanium dioxide by oxidation of titanium tetrachloride in a plug flow reactor, wherein the titanium tetrachloride is introduced into the reactor in at least two stages and is used exclusively in liquid form. The total quantity of liquid TiCl4 used is split up in several stages. A small quantity is added in the first stage in order to start combustion despite using the liquid phase. In the first phase, the activation energy required is provided solely via the preheated oxygen. In all other stages, the activation energy is provided by the preheated oxygen and the reaction enthalpy of TiCl4 oxidation released in the upstream stages.
    Type: Application
    Filed: October 22, 2012
    Publication date: March 7, 2013
    Applicant: Kronos International, Inc.
    Inventor: Rainer Gruber
  • Patent number: 8323613
    Abstract: The manufacture of titanium dioxide by oxidation of titanium tetrachloride in a plug flow reactor, wherein the titanium tetrachloride is introduced into the reactor in at least two stages and is used exclusively in liquid form. The total quantity of liquid TiCl4 used is split up in several stages. A small quantity is added in the first stage in order to start combustion despite using the liquid phase. In the first phase, the activation energy required is provided solely via the preheated oxygen. In all other stages, the activation energy is provided by the preheated oxygen and the reaction enthalpy of TiCl4 oxidation released in the upstream stages.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: December 4, 2012
    Assignee: Kronos International, Inc.
    Inventor: Rainer Gruber
  • Patent number: 8298507
    Abstract: A process for producing a fine particulate titanium dioxide, comprising charging a fine particulate titanium dioxide powder in a resin bag, spraying water droplets having a liquid droplet diameter of 5 to 500 ?m to the powder in the bag, and closing the bag for storing the powder in the bag.
    Type: Grant
    Filed: November 3, 2010
    Date of Patent: October 30, 2012
    Assignee: Showa Denko K.K.
    Inventors: Hisao Kogoi, Susumu Kayama, Jun Tanaka
  • Patent number: 8295786
    Abstract: The present invention provides a magnetic sheet with improved resistance to folding while maintaining good magnetic characteristics and reliability; a method for producing the magnetic sheet; an antenna; and a portable communication device. A magnetic sheet of the present invention includes a flat magnetic powder, and a resin binder capable of dissolving in a solvent, wherein the magnetic sheet has a gradient of the content ratio of the magnetic powder to the resin binder in a thickness direction thereof, wherein, in use, the magnetic sheet is folded so that, of the front and back surfaces thereof, one surface whose magnetic powder content is lower than that of the other is folded inward, and wherein the difference in glossiness measured at a light-incident angle of 60° between the front and back surfaces is 9.4 or more.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: October 23, 2012
    Assignee: Sony Chemical & Information Device Corporation
    Inventors: Keisuke Aramaki, Junichiro Sugita, Morio Sekiguchi
  • Publication number: 20120252999
    Abstract: Systems and methods of producing chemical compounds are disclosed. An example chemical production system includes a combustion chamber having intake ports for entry of a gas mixture. An igniter ignites the gas mixture in the intake chamber to facilitate a reaction at a high temperature and high pressure. A nozzle restricts exit of the ignited gas mixture from the combustion chamber. An expansion chamber cools the ignited gas. The expansion chamber has an exhaust where the cooled gas exits the expansion chamber. A chemical compound product is formed in the expansion chamber.
    Type: Application
    Filed: April 12, 2012
    Publication date: October 4, 2012
    Inventor: Bruce H. Peters
  • Publication number: 20120219494
    Abstract: This disclosure relates to a process for producing titanium dioxide, comprising: reacting aluminum and an alloy comprising silicon and titanium having a silicon content of at least 5%, based on the weight of the ahoy, with chlorine gas at temperatures above 190° C. to form chlorides of silicon, aluminum and titanium; adding titanium tetrachloride to the chlorides of silicon, aluminum and titanium; oxidizing the chlorides of silicon, aluminum and titanium and titanium tetrachloride; and forming titanium dioxide.
    Type: Application
    Filed: November 9, 2010
    Publication date: August 30, 2012
    Inventor: Charles David Musick
  • Patent number: 8178074
    Abstract: Titanium oxide particles having a particle having a decahedral box-shape and a particle size in a range of from 1 nm to 100 nm can be selectively and efficiently produced by carrying out a method in which in a case of oxidizing titanium tetrachloride in vapor at high temperatures, it is rapidly heated and cooled, and a method, in which water vapor is used as an oxidizing gas, in combination under certain conditions.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: May 15, 2012
    Assignees: Showa Denko K.K., National University Corporation Hokkaido University
    Inventors: Yasushi Kuroda, Noriyuki Sugishita, Bunsho Ohtani
  • Patent number: 8147794
    Abstract: The invention relates to manufacturing titanium dioxide by oxidizing titanium tetrachloride by a multi-stage method, where liquid titanium tetrachloride is used in a first and gaseous titanium tetrachloride is used in a second stage. The process is energetically more favorable and offers the possibility, to a certain extent, of controlling the mean particle size of the end product.
    Type: Grant
    Filed: February 16, 2010
    Date of Patent: April 3, 2012
    Assignee: Kronos International, Inc.
    Inventor: Rainer Gruber
  • Publication number: 20120058044
    Abstract: This disclosure relates to a flue providing improved heat transfer comprising an inner layer and an outer layer, wherein the inner layer comprises a high thermal conductivity ceramic having a thermal conductivity of at least 91 W/m-K (@300K) and a Moh's hardness of at least 6.5, and comprises a plurality of protuberances 13, depressions 14 or both; and wherein the inner layer 12 and the outer layer 11 are in substantially continuous, thermally conductive contact. Titanium dioxide particles having improved particle size, gloss, undertone, tinting strength and hiding power are famed using the above described flue.
    Type: Application
    Filed: May 7, 2010
    Publication date: March 8, 2012
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventor: Charles David Musick
  • Patent number: 8114377
    Abstract: This disclosure relates to process for producing titanium dioxide pigment having reduced chlorides, comprising: a) reacting titanium tetrahalide vapor, rutile-forming agent and at least a stoichiometric amount of oxygen in a reactor to form a gaseous suspension comprising titanium dioxide particles; b) introducing silicon tetrachloride into the reactor at least one point downstream of the point of contact of the titanium tetrahalide, the rutile forming agent and the oxygen, and where at least 97% of the titanium tetrahalide has been converted to titanium dioxide to provide a substantially uniform encapsulation of pyrogenic SiO2 on the titanium dioxide; c) passing the gaseous suspension to a cooling conduit; d) introducing scouring material, typically selected from the group of calcined titanium dioxide and compressed titanium dioxide, and mixtures thereof, into the cooling conduit; wherein the particles of the scouring material have a diameter in the range of about 0.25 mm to about 12.
    Type: Grant
    Filed: November 2, 2006
    Date of Patent: February 14, 2012
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Alan Roger Eaton, Rajeev Lochan Gorowara, Narayanan Sankara Subramanian, Stephen William Taylor
  • Patent number: 8114376
    Abstract: The manufacture of titanium dioxide by oxidation of titanium tetrachloride in a multistage method, where both oxygen and titanium tetrachloride are added in several stages. In the first stage gaseous TiCl4 is introduced into a preheated oxygen-containing gaseous stream in a stoichiometric or hyper-stoichiometric amount to produce a TiO2 containing gas suspension. In the second or further stages liquid TiCl4 and oxygen-containing gas is introduced into the TiO2 containing gas suspension to produce further TiO2.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: February 14, 2012
    Assignee: Kronos International, Inc.
    Inventor: Rainer Gruber
  • Patent number: 8071070
    Abstract: Provided is a crystalline TiO2 powder in the form of aggregated primary particles having a variable sintering stability at a BET surface area of 70-100 m2/g and a rutile content of greater than 10% but less than or equal to 40%, and a process for preparing the crystalline TiO2 powder, which involves: introducing a TiCl4 vapor and, separately therefrom, H2 and a primary air into a mixing chamber to produce a gaseous mixture; igniting the gaseous mixture in a burner to produce a flame, which is burned into a reaction chamber to produce the crystalline TiO2 powder and gaseous substances; and separating the crystalline TiO2 powder from the gaseous substances, wherein the relative amounts of TiCl4 vapor, H2 and primary air are selected to provide crystalline TiO2 powder having the aforementioned BET surface area and rutile content, with the proviso that factor A has a value of 0.1-0.4 g/m2 in accordance within the following formula: factor A=105{[(TiCl4 vapor×H2)/(amount of air×gaseous mixture)]/BET]}.
    Type: Grant
    Filed: May 24, 2010
    Date of Patent: December 6, 2011
    Assignee: Evonik Degussa GmbH
    Inventors: Christian Schulze-Isfort, Kai Schumacher, Nina Schuhardt, Oswin Klotz, Rainer Golchert
  • Publication number: 20110293508
    Abstract: Disclosed herein are pigments comprising mostly rutile TiO2, wherein the mostly rutile TiO2 consists essentially of low abrasion TiO2 particles produced by introducing a metal halide into the chloride process. Further disclosed are ink, can coatings, fibers, papers, and plastics comprising the pigment. Also disclosed herein are pigments comprising the low abrasion TiO2 pigments comprising TiO2 particles which have been further heat treated at a temperature of at least about 800° C. in an oxidizing atmosphere for a time period of at least about 1 hour.
    Type: Application
    Filed: August 8, 2011
    Publication date: December 1, 2011
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: MICHAEL ANDREW HOFMANN, CHARLES DAVID MUSICK, NARAYANAN SANKARA SUBRAMANIAN, KOSTANTINOS KOURTAKIS, AUSTIN HENRY REID, JR.
  • Patent number: 8062622
    Abstract: A crystalline titanium dioxide powder, containing aggregated primary particles, wherein a BET surface area of the aggregated primary particles is from 30 to 65 m2/g, and a rutile content of a sum of crystalline modifications in the crystalline titanium dioxide is from of 50-70%.
    Type: Grant
    Filed: December 10, 2009
    Date of Patent: November 22, 2011
    Assignee: Evonik Degussa GmbH
    Inventors: Christian Schulze-Isfort, Oswin Klotz, Rainer Golchert, Uwe Diener, Kai Schumacher
  • Patent number: 7968077
    Abstract: A method for manufacturing titanium dioxide by reacting titanium tetrachloride with an oxygen-bearing gas in a tubular reactor and subsequently cooling the titanium dioxide particle/gas mixture in a cooling section, where the gas/particle flow is caused to rotate. Titanium tetrachloride is introduced in the cross-sectional plane of the reactor, but not in the radial direction, whereby the flow velocity of the oxygen-bearing gas is more than 20 m/s. Scrub solids free the inner wall of the reactor and the reactor cooling section of TiO2 deposits, thereby achieving a better cooling performance, which produces a TiO2 pigment with a narrow particle size distribution.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: June 28, 2011
    Assignee: Kronos International, Inc.
    Inventors: Rainer Gruber, Frank Malcharek
  • Patent number: 7932208
    Abstract: A method of preparing stable, transparent photocatalytic titanium dioxide sots is disclosed which involves thermal treatment of a suspension of amorphous titanium dioxide in the presence of certain alpha-hydroxy acids. The sots comprise titanium dioxide particles in the anatase form having a crystallite size less than about 10 nm and exhibit excellent stability and transparency at basic, neutral, and acid pH.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: April 26, 2011
    Assignee: Millennium Inorganic Chemicals, Inc.
    Inventors: Guoyi Fu, Billiejo M. Monk, Robert McIntyre
  • Patent number: 7910515
    Abstract: Silicon titanium mixed oxide powder having the following features: BET surface area of 5 to 300 m2/g, silica content, based on the total amount of the mixed oxide powder, of ?0.1 to <0.5% by weight, titanium dioxide content, based on the total amount of the mixed oxide powder, of ?99.0% by weight, sum of the proportions of silica and titanium dioxide, based on the total amount of the mixed oxide powder, ?99.5% by weight, titanium dioxide content of the primary particles comprising intergrown rutile and anatase phases, silica content of the primary particles amorphous, is prepared by allowing the vapours of one or more, in each case oxidizable and/or hydrolyzable titanium and silicon compounds to react in a high temperature zone with oxygen and/or steam, cooling the reaction mixture after the reaction and separating off the pulverulent solid from gaseous substances.
    Type: Grant
    Filed: July 6, 2006
    Date of Patent: March 22, 2011
    Assignee: Evonik Degussa GmbH
    Inventors: Reinhard Vormberg, Kai Schumacher
  • Publication number: 20110008246
    Abstract: Systems and methods for generating nanomaterial are described wherein a reaction, for example, oxidation, for generating nanomaterial occurs in an open reaction zone which is external to the nanoparticle generator. The systems and methods minimize damage to the hot wall reactors evident in conventional systems and methods used to generate nanomaterial.
    Type: Application
    Filed: February 23, 2009
    Publication date: January 13, 2011
    Applicant: CORNING INCORPORATED
    Inventors: Calvin Thomas Coffey, Andrey V. Filippov, Clinton Damon Osterhout, Carlton Maurice Truesdale
  • Patent number: 7854917
    Abstract: A process for manufacturing titanium dioxide by the chloride process is provided. In one embodiment, a particle size control agent comprising an ionizing agent such as potassium chloride is introduced into the reaction zone of the oxidation reactor to control the particle size of the titanium dioxide. In a first aspect, the effectiveness of the particle size control agent in controlling the particle size of the titanium dioxide is improved by adding the particle size control agent to at least one of the reactant streams at a sufficient distance upstream of the oxidization reactor to allow the ionizing agent to efficiently ionize and the particle size control agent to thoroughly admix with the stream(s) prior to entering the reaction zone. In a second aspect, the particle size control agent comprises an ionizing agent and fumed silica. In another embodiment, the amount of alumina added to the reaction zone of the oxidization reactor is increased in order to control the particle size of the titanium dioxide.
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: December 21, 2010
    Assignee: Tronox LLC
    Inventors: Harry E. Flynn, Robert O. Martin, Charles A. Natalie, Jeffrey W. Giles
  • Publication number: 20100215569
    Abstract: The invention relates to manufacturing titanium dioxide by oxidising titanium tetrachloride by a multi-stage method, where liquid titanium tetrachloride is used in a first and gaseous titanium tetrachloride is used in a second stage. The process is energetically more favourable and offers the possibility, to a certain extent, of controlling the mean particle size of the end product.
    Type: Application
    Filed: February 16, 2010
    Publication date: August 26, 2010
    Inventor: Rainer Gruber
  • Patent number: 7763565
    Abstract: A method of preparing stable, transparent photocatalytic titanium dioxide sols is disclosed which involves thermal treatment of a suspension of amorphous titanium dioxide in the presence of certain alpha-hydroxy acids. The sots comprise titanium dioxide particles in the anatase form having a crystallite size less than about 10 nm and exhibit excellent stability and transparency at basic, neutral, and acid pH.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: July 27, 2010
    Assignee: Millennium Inorganic Chemicals, Inc.
    Inventors: Guoyi Fu, BillieJo M. Monk, Robert McIntyre
  • Publication number: 20100150819
    Abstract: A crystalline titanium dioxide powder, containing aggregated primary particles, wherein a BET surface area of the aggregated primary particles is from 30 to 65 m2/g, and a rutile content of a sum of crystalline modifications in the crystalline titanium dioxide is from of 50-70%.
    Type: Application
    Filed: December 10, 2009
    Publication date: June 17, 2010
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Christian Schulze-Isfort, Oswin Klotz, Rainer Golchert, Uwe Diener, Kai Schumacher
  • Patent number: 7708975
    Abstract: There is described a process for preparing metal oxide particles which are substantially free of coarse tail from an oxidizing agent and a vaporous metal reactant in a flow reactor; comprising, (a) directing a flow of the metal reactant into a contacting region of the flow reactor; comprising (a) passing a flow of oxidizing agent through a high temperature zone of the flow reactor to form a flow of hot oxidizing agent and directing the flow of the hot oxidizing agent onto the contacting region of the flow reactor at a flow condition sufficient to form a reaction stream comprising a flow of hot oxidizing agent, a flow of metal reactant and a diffusive flow of the hot oxidizing agent and the metal reactant, the temperature of the hot oxidizing agent being at least sufficient to initiate oxidation of the metal reactant in the diffusive flow; (c) passing the reaction stream into a reaction zone of the flow reactor, while simultaneously introducing a flow of an upper cooling fluid substantially coaxially with the
    Type: Grant
    Filed: July 18, 2005
    Date of Patent: May 4, 2010
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Juergen Kurt Plischke, Stephan Claude de la Veaux, Scott Rickbeil Frerichs, Jodi Lynn Witt, Christian Normand
  • Publication number: 20100098621
    Abstract: The disclosure relates to a process for making titanium dioxide, comprising: reacting titanium tetrachloride with oxygen by contacting the titanium tetrachloride with the oxygen in a vapor phase reactor under mixing conditions and at an elevated temperature to form a gaseous product stream containing titanium dioxide; separating the titanium dioxide from the gaseous product stream to form a process stream; analyzing the process stream to detect a concentration of titanium tetrachloride in the process stream; comparing the concentration of titanium tetrachloride detected in the process stream to an aim point concentration; and modifying the oxidation conditions to restore or maintain the concentration of titanium tetrachloride in the process stream at the aim point.
    Type: Application
    Filed: October 5, 2007
    Publication date: April 22, 2010
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Robert E. Bucher, JR., James Timothy Cronin, Yung-Hsing Samson Hsu, Charles David Musick, Kunle Ogunde, Robert Rossi
  • Patent number: 7686881
    Abstract: Flame-hydrolytically produced titanium dioxide powder that is present in the form of aggregates of primary particles, and has a BET surface of 20 to 200 m²/g, a half width (HW) [nm] of the primary particle distribution of HW = a×BETf where a = 670×10?9 m³/g and ?1.3 ≤ f ≤ ?1.0 and the proportion of particles with a diameter of more than 45 &mgr;m lies in a range from 0.0001 to 0.05 wt. %. The powder is produced by a process in which a titanium halide is vapourised at temperatures of less than 200°C.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: March 30, 2010
    Assignee: Degussa AG
    Inventors: Kai Schumacher, Andreas Schild, Martin Moerters
  • Patent number: 7638113
    Abstract: The disclosure relates to a process for making titanium dioxide, comprising: reacting titanium tetrachloride with oxygen by contacting the titanium tetrachloride with the oxygen in a vapor phase reactor under mixing conditions and at an elevated temperature to form a gaseous product stream containing titanium dioxide; separating the titanium dioxide from the gaseous product stream to form a process stream; analyzing the process stream to detect a concentration of titanium tetrachloride in the process stream; comparing the concentration of titanium tetrachloride detected in the process stream to an aim point concentration; and modifying the oxidation conditions to restore or maintain the concentration of titanium tetrachloride in the process stream at the aim point.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: December 29, 2009
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Robert E Bucher, Jr., James Timothy Cronin, Yung-Hsing Samson Hsu, Charles David Musick, Kunle Ogunde, Robert J. Rossi, Barbara A. Kirsch
  • Patent number: 7591991
    Abstract: An anatase-type ultrafine particulate titanium oxide produced through a vapor-phase process, which has low chlorine content and exhibits excellent dispersibility as compared with conventional titanium oxide having a BET specific surface area comparable to that of the ultrafine particulate titanium oxide. When the ultrafine particulate titanium oxide is subjected to dechlorination, the titanium oxide satisfies the relation between BET surface area (B) and chlorine content (C) represented by the formula C?650e0.02B. The ultrafine particulate titanium oxide has a D90 of 2.5 (m or less as measured by means of laser diffraction particle size analysis. The present invention also provides a process for producing the ultrafine particulate titanium oxide.
    Type: Grant
    Filed: March 6, 2003
    Date of Patent: September 22, 2009
    Assignee: Showa Denko K.K.
    Inventors: Susumu Kayama, Jun Tanaka
  • Patent number: 7585488
    Abstract: An anatase-type titanium oxide powder having a ratio of rutile to anatase of 10% or less and a BET specific surface area of 20 to 80 m2/g. Since the titanium oxide powder has a large specific surface area and a low ratio of rutile to anatase in comparison with a conventional titanium oxide powder and excels in dispersibility, the titanium oxide powder is suitable for various applications.
    Type: Grant
    Filed: March 10, 2005
    Date of Patent: September 8, 2009
    Assignee: Toho Titanium Co., Ltd.
    Inventor: Hideki Sakai
  • Publication number: 20090098041
    Abstract: The manufacture of titanium dioxide by oxidation of titanium tetrachloride in a multistage method, where both oxygen and titanium tetrachloride are added in several stages. In the first stage gaseous TiCl4 is introduced into a preheated oxygen-containing gaseous stream in a stoichiometric or hyper-stoichiometric amount to produce a TiO2 containing gas suspension. In the second or further stages liquid TiCl4 and oxygen-containing gas is introduced into the TiO2 containing gas suspension to produce further TiO2.
    Type: Application
    Filed: September 26, 2008
    Publication date: April 16, 2009
    Inventor: Rainer Gruber
  • Publication number: 20090098042
    Abstract: The manufacture of titanium dioxide by oxidation of titanium tetrachloride in a plug flow reactor, wherein the titanium tetrachloride is introduced into the reactor in at least two stages and is used exclusively in liquid form. The total quantity of liquid TiCl4 used is split up in several stages. A small quantity is added in the first stage in order to start combustion despite using the liquid phase. In the first phase, the activation energy required is provided solely via the preheated oxygen. In all other stages, the activation energy is provided by the preheated oxygen and the reaction enthalpy of TiCl4 oxidation released in the upstream stages.
    Type: Application
    Filed: September 26, 2008
    Publication date: April 16, 2009
    Inventor: Rainer Gruber
  • Patent number: 7476378
    Abstract: This disclosure relates to a process for producing titanium dioxide, comprising: a) providing a quantity of liquid titanium tetrahalide for reacting with an oxygen-containing gas; b) vaporizing a first portion of the liquid titanium tetrahalide and reacting the titanium tetrahalide vapor and the oxygen-containing gas, in a first stage of a reaction zone, the reaction zone temperature ranging from at least about 650° C.—to form a reaction product at least containing titanium dioxide and oxygen-containing gas and passing the reaction product, more typically in the vapor phase, to at least one additional stage of the reaction zone; and c) charging at least one additional portion of the liquid titanium tetrahalide to the at least one additional stage of the reaction zone to cool the titanium dioxide and to react with the oxygen-containing gas to form additional titanium dioxide.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: January 13, 2009
    Assignee: E.I. DuPont deNemours & Company
    Inventors: Narayanan Sankara Subramanian, Richard P. Bernard, Yung-Hsing Samson Hsu, Charles David Musick, Kunle Ogunde, James Nelson Tilton
  • Publication number: 20080318046
    Abstract: Provided is a crystalline TiO2 powder in the form of aggregated primary particles having a variable sintering stability at a BET surface area of 70-100 m2/g and a rutile content of greater than 10% but less than or equal to 40%, and a process for preparing the crystalline TiO2 powder, which involves: introducing a TiCl4 vapor and, separately therefrom, H2 and a primary air into a mixing chamber to produce a gaseous mixture; igniting the gaseous mixture in a burner to produce a flame, which is burned into a reaction chamber to produce the crystalline TiO2 powder and gaseous substances; and separating the crystalline TiO2 powder from the gaseous substances, wherein the relative amounts of TiCl4 vapor, H2 and primary air are selected to provide crystalline TiO2 powder having the aforementioned BET surface area and rutile content, with the proviso that factor A has a value of 0.1-0.4·105 g/m2 in accordance within the following formula: factor A=105{[(TiCl4 vapor×H2)/(primary air×gaseous mixture)]/BET]}.
    Type: Application
    Filed: May 22, 2008
    Publication date: December 25, 2008
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Christian SCHULZE-ISFORT, Kai Schumacher, Nina Schuhardt, Oswin Klotz, Rainer Golchert
  • Patent number: 7468175
    Abstract: A high photosensitivity titanium oxide composition includes a plurality of nanosize particles including titanium dioxide and titanium suboxide. The particles are substantially non-stoichiometric (TiO2-x, wherein 0.1<×<0.3 at a surface of the particles, and in the bulk of the particles x is less than at the surface), having a magnetic susceptibility value (?) of at least 0.8·10?6 cm3/g at 300 K and being at least 30% by weight rutile. A related method of forming a high photosensitivity titanium oxide composition includes the steps of providing a titanium chloride compound, such as titanium tetrachloride, an oxygen-containing gas and hydrogen, wherein a concentration of the hydrogen is in a stoichiometric excess (H2:O2) from 2.02:1 to 2.61:1. The titanium chloride compound is burned in the presence of oxygen from the oxygen-containing gas and hydrogen to form plurality of ultrafine particles comprising titanium dioxide and titanium suboxide.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: December 23, 2008
    Assignee: Worthington Technologies, LLC
    Inventors: Ihor Mykhaylovych Kobasa, Wojciech Jan Strus, Mykhaylo Andriyovych Kovbasa
  • Patent number: 7465430
    Abstract: There is described an apparatus for making metal oxide particles which are substantially free of coarse tail from an oxidizing agent and a metal reactant in a flow reactor. The apparatus can be a concentric tubular flow reactor comprising a substantially funnel-shaped reactant contacting region located adjacent to a reaction zone which is able to direct a flow of a hot oxidizing agent towards a flow of the metal reactant to form a reaction stream which flows downstream into a reaction zone, whereby the hot oxidizing agent of the reaction stream is able to surround the flow of metal reactant sufficient to prevent the metal reactant from contacting the wall of the reactant contacting region and forming scale on the wall.
    Type: Grant
    Filed: July 18, 2005
    Date of Patent: December 16, 2008
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Juergen Kurt Plischke, Stephan Claude De La Veaux, Scott Rickbeil Frerichs, Jodi Lynn Witt, Christian Normand
  • Publication number: 20080305363
    Abstract: Disclosed herein are pigments comprising mostly rutile TiO2, wherein the mostly rutile TiO2 consists essentially of low abrasion TiO2 particles produced by introducing a metal halide into the chloride process. Further disclosed are ink, can coatings, fibers, papers, and plastics comprising the pigment. Also disclosed herein are pigments comprising the low abrasion TiO2 pigments comprising TiO2 particles which have been further heat treated at a temperature of at least about 800° C. in an oxidizing atmosphere for a time period of at least about 1 hour.
    Type: Application
    Filed: August 15, 2008
    Publication date: December 11, 2008
    Inventors: Michael Andrew Hofmann, Charles David Musick, Narayanan Sankara Subramanian, Kostantinos Kourtakis, Austin Henry Reid, JR.
  • Publication number: 20080292539
    Abstract: A crystalline titanium dioxide powder, containing aggregated primary particles, wherein a BET surface area of the aggregated primary particles is from 30 to 65 m2/g, and a rutile content of a sum of crystalline modifications in the crystalline titanium dioxide is from of 50-70%.
    Type: Application
    Filed: May 22, 2008
    Publication date: November 27, 2008
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Christian Schulze-Isfort, Oswin Klotz, Rainer Golchert, Uwe Diener, Kai Schumacher
  • Publication number: 20080267852
    Abstract: Process for preparing pulverulent solids, in which one or more oxidizable and/or hydrolysable metal compounds are reacted in a high-temperature zone in the presence of oxygen and/or steam, the reaction mixture is cooled after the reaction, and the pulverulent solid is removed from gaseous substances, wherein at least one metal compound is introduced into the high-temperature zone in solid form and the evaporation temperature of the metal compound is below the temperature of the high-temperature zone.
    Type: Application
    Filed: November 29, 2006
    Publication date: October 30, 2008
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Kai Schumacher, Stefan Fiedler, Roland Schilling, Ronald Ihmig, Stipan Katusic
  • Publication number: 20080260627
    Abstract: A process for manufacturing titanium dioxide by the chloride process is provided. In one embodiment, a particle size control agent comprising an ionizing agent such as potassium chloride is introduced into the reaction zone of the oxidation reactor to control the particle size of the titanium dioxide. In a first aspect, the effectiveness of the particle size control agent in controlling the particle size of the titanium dioxide is improved by adding the particle size control agent to at least one of the reactant streams at a sufficient distance upstream of the oxidization reactor to allow the ionizing agent to efficiently ionize and the particle size control agent to thoroughly admix with the stream(s) prior to entering the reaction zone. In a second aspect, the particle size control agent comprises an ionizing agent and fumed silica. In another embodiment, the amount of alumina added to the reaction zone of the oxidization reactor is increased in order to control the particle size of the titanium dioxide.
    Type: Application
    Filed: September 16, 2005
    Publication date: October 23, 2008
    Applicant: TRONOX LLC
    Inventors: Harry E. Flynn, Robert O. Martin, Charles A. Natalie, Jeffrey W. Giles