Seed Patents (Class 23/301)
  • Patent number: 10384190
    Abstract: The present invention relates to a tubular reactor (14) for multi-phase polymerization, in particular for producing butyl rubber, comprising a pipe piece (16) for radially delimiting a reactor volume between an inlet (18) and an outlet (20), a stirrer (22) for generating a flow (27) in the radial direction of the pipe piece (16), wherein the stirrer (22) is dimensioned and operable such that the flow (27) is impartable with a centrifugal force which generates a concentration distribution in the radial direction inside the pipe piece (16) and an outlet conduit (32) for discharging a concentrated radially inner part (30) of the flow (27, 28). Enrichment of polymer particles in the radially inner part (30) of the flow (27, 28) avoids gumming of the pipe piece (16) by the polymer particles so that the risk of a blockage is reduced.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: August 20, 2019
    Inventor: Joachim Ritter
  • Patent number: 10369493
    Abstract: A continuous process for producing crystalline ammonium sulfate, said process comprising a start-up operation followed by a steady-state operation, wherein the start-up operation comprises: i) in a crystallizer, evaporating solvent from an approximately saturated ammonium sulfate solution; ii) replacing evaporated solvent with further approximately proximately saturated ammonium sulfate solution; iii) introducing to the crystallizer seed crystals of ammonium sulfate; iv) continuing to evaporate solvent, until a desired degree of supersaturation is reached; and v) recovering crystalline ammonium sulfate from ammonium sulfate solution in a recovery unit, and the steady-state operation comprises: vi) continuously feeding approximately saturated ammonium sulfate solution into the crystallizer and continuously withdrawing ammonium sulfate crystals from the crystallizer, such that the total combined volume of ammonium sulfate solution and ammonium sulfate crystals within the crystallizer remains constant; and vii)
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: August 6, 2019
    Assignee: CAP III B.V.
    Inventors: Geert Ekkelenkamp, Johan Thomas Tinge, Pieter Vonk
  • Patent number: 9428400
    Abstract: Titanium dioxide and an electro-conductive titanium oxide which each includes particles having a large major-axis length in a large proportion and comprises columnar particles having a satisfactory particle size distribution. A titanium compound, an alkali metal compound, and an oxyphosphorus compound are heated/fired in the presence of titanium dioxide nucleus crystals having an aspect ratio of 2 or higher to grow the titanium dioxide nucleus crystals. Subsequently, a titanium compound, an alkali metal compound, and an oxyphosphorus compound are further added and heated/fired in the presence of the grown titanium dioxide nucleus crystals. Thus, titanium dioxide is produced which comprises columnar particles having a weight-average major-axis length of 7.0-15.0 ?m and in which particles having a major-axis length of 10 ?m or longer account for 15 wt. % or more of all the particles. A solution of a tin compound and a solution of compounds of antimony, phosphorus, etc.
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: August 30, 2016
    Assignee: ISHIHARA SANGYO KAISHA, LTD.
    Inventors: Kaoru Isobe, Katsuichi Chiba, Takanori Sakamoto
  • Patent number: 8926713
    Abstract: Titanium dioxide which includes particles having a large major-axis length in a large proportion and comprises columnar particles having a satisfactory particle size distribution. A titanium compound, an alkali metal compound, and an oxyphosphorus compound are heated/fired in the presence of titanium dioxide nucleus crystals having an aspect ratio of 2 or higher to grow the titanium dioxide nucleus crystals. Subsequently, a titanium compound, an alkali metal compound, and an oxyphosphorus compound are further added and heated/fired in the presence of the grown titanium dioxide nucleus crystals. Thus, titanium dioxide is produced which comprises columnar particles having a weight-average major-axis length of 7.0-15.0 ?m and in which particles having a major-axis length of 10 ?m or longer account for 15 wt. % or more of all the particles.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: January 6, 2015
    Assignee: Ishihara Sangyo Kaisha, Ltd.
    Inventors: Kaoru Isobe, Katsuichi Chiba, Takanori Sakamoto
  • Patent number: 8835005
    Abstract: The present invention relates to a process for the preparation of granules comprising the steps of: providing a granulation zone comprising particles, the particles being kept in motion; providing a first feed stream comprising a liquid composition into the granulation zone, the liquid composition being applied onto or over the moving particles in the granulation zone; withdrawing a product stream comprising granules from the granulation zone, the granules being the result of layered growth of the moving particles in the granulation zone; wherein a second feed stream comprising granulation nuclei is fed into the granulation zone, wherein the granulation nuclei have a particle size distribution characterized by a standard deviation of the particle size that is less than 15% of the mean particle size, and wherein the second feed stream comprises between 0.05 wt % and 50 wt % of the product stream.
    Type: Grant
    Filed: August 10, 2010
    Date of Patent: September 16, 2014
    Assignee: Stamicarbon B.V.
    Inventors: Willem Frederik Roos, Fredericus Henricus Maria Buitink
  • Patent number: 8323360
    Abstract: A method of crystallization is provided. The method includes providing a solution comprising a solute dissolved in a first solvent. The method includes providing a dispersion comprising a plurality of nanoparticles in a second solvent. The first solvent and the second solvent are mutually miscible. The method includes combining the solution and the dispersion to form a mixture. The nanoparticles remain dispersed in the mixture and the solute remains dissolved in the mixture at or below a saturation concentration. The method includes cooling the mixture such that the solute exceeds the saturation concentration forming crystals in the presence of the dispersed nanoparticles. The method includes separating the crystals from the mixture, wherein the nanoparticles remain dispersed in the mixture.
    Type: Grant
    Filed: June 26, 2009
    Date of Patent: December 4, 2012
    Assignee: 3M Innovative Properties Company
    Inventors: Jimmie R. Baran, Jr., William J. Hunt
  • Patent number: 8298300
    Abstract: The invention relates to a continuous process for preparing large crystal products of a crystalline product in a fluid bed crystallizer, said fluid bed crystallizer comprising a crystallization vessel and means for mechanically impacting of crystals; and connected to the crystallization vessel (i) a feed line; (ii) an external circulation circuit comprising means for determining properties of the slurry in the external circulation circuit and a heat exchanger; and (iii) a product withdrawal line, wherein—for any specific crystalline product and at any flow rate chosen in the external circulation circuit—the weight percentage of crystals of the crystalline product in the slurry in the external circulation circuit, ECCWPC, is controlled by said means for determining properties of the slurry within a specified and predetermined narrow range having a maximum and minimum value not more apart than at most 25% by weight and falling within the range of from 1 to 50% by weight.
    Type: Grant
    Filed: July 19, 2007
    Date of Patent: October 30, 2012
    Assignee: DSM IP Assets B.V.
    Inventor: Geert Ekkelenkamp
  • Patent number: 8288022
    Abstract: A perovskite phosphor film emitting red light from among the three primary colors (i.e., red, green and blue) underlying the construction of displays which is fabricated by adsorbing a nanosheet as a seed layer on a solid substrate and forming an oriented film of an oxide phosphor thereon, characterized in that the perovskite phosphor film comprises a film of an oxide phosphor (3) having a high transparency that is formed on a seed layer comprising a nanosheet (2) that is adsorbed on a solid substrate (1) such as a glass substrate or the like, and the oxide phosphor (3) is (SrxCa1-x)1-yPryTiO3: 0?x?0.8, 0.001?y?0.01.
    Type: Grant
    Filed: July 17, 2009
    Date of Patent: October 16, 2012
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Keiichi Ikegami, Hiroshi Takashima, Takeo Ebina, Hiroyuki Tetsuka
  • Patent number: 8178066
    Abstract: The present invention provides a method for stabilizing fine particles of calcium phosphates without lowering their solid phase forming activity. It is possible to stabilize the fine particles of calcium phosphates by stopping the growth of the fine particles formed in an aqueous solution supersaturated with respect to calcium phosphates. More specifically, the fine particles of calcium phosphates were stabilized by lowering the inorganic ion concentration of a fine-particle-forming solution containing fine particles of calcium phosphates by dialysis, ion exchange, dilution, or the like, or by separating the fine particles of calcium phosphates from the fine-particle-forming solution by filtration, centrifuging, or the like.
    Type: Grant
    Filed: August 15, 2006
    Date of Patent: May 15, 2012
    Assignee: Kyoto University
    Inventors: Takeshi Yao, Mitsuhiro Hibino, Seiji Yamaguchi, Hidetaka Okada
  • Patent number: 7820057
    Abstract: The invention relates to a method for removing at least one constituent from a solution, comprising:—forming a liquid mixture by bringing together said solution (1) and a particulate seed material (6) under conditions or in the presence of one or more substances which cause the constituent to be removed to crystallize out on the surface of the seed material; and—separating the seed material having the constituent to be removed crystallized out thereon from the liquid mixture by passing the liquid mixture through a filter (3), wherein the pore size of the filter (3) is greater than or equal to the particle size of the seed material (6). The invention also relates to a method for preparing a particulate material wherein use is made of the method according to the present invention. The invention also relates to the particulate material obtainable by this method. The invention further relates to an apparatus that can be used in the process of the present invention.
    Type: Grant
    Filed: October 8, 2004
    Date of Patent: October 26, 2010
    Assignee: Nederlandse Organisatie voor toegepastnatuurwetenschappelijk Onderzoek TNO
    Inventors: Dirk Verdoes, Johannes van der Meer, Earl Lawrence Vincent Goetheer
  • Patent number: 7763223
    Abstract: In a synthetic method for porous silica crystals through a hydrothermal reaction, a method for synthesizing porous silica crystals with a size of 0.5 mm or larger in high reproducibility and efficiency is provided using a method for manufacturing the porous silica crystals, wherein a high concentration area with silicon is formed as a partial area inside a hydrothermal synthesis vessel, and at least a part of a surface-smoothed bulk material is present in the high concentration area with silicon to perform the hydrothermal reaction, the bulk material comprising a compound containing both silicon and oxygen as a supply source for a part or a whole of the structure composition elements of the porous silica crystals.
    Type: Grant
    Filed: September 12, 2005
    Date of Patent: July 27, 2010
    Assignees: Shimane Prefectural Government, Shimane University
    Inventors: Shuji Noda, Takanobu Shiomura, Masahiro Tajima, Naoto Imawaka, Yasuaki Okamoto, Takeshi Kubota
  • Patent number: 7736614
    Abstract: A process for removing aluminum and other metal chlorides from liquid chlorosilanes with the steps of: introducing a source of seed into a source of impure liquid chlorosilanes, initiating the crystallization of aluminum and other metal chlorides on the seed from the liquid chlorosilanes in a first agitated vessel, passing the resulting mixture of liquid and solids through a cooler into a second agitated vessel for additional crystallization, transferring the resulting mixture of liquid and solids into a solids removal device, transferring the liquid with reduced solids content to a further process or vessel and transferring the liquid with high solids content into a waste concentration device, passing the resulting liquid with reduced solids content to a further process or vessel and passing the resultant liquid with very high solids content to a waste storage vessel with agitation.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: June 15, 2010
    Assignee: Lord Ltd., LP
    Inventor: Stephen Michael Lord
  • Publication number: 20100024172
    Abstract: The invention relates to a continuous process for preparing large crystal products of a crystalline product in a fluid bed crystallizer, said fluid bed crystallizer comprising a crystallization vessel and means for mechanically impacting of crystals; and connected to the crystallization vessel (i) a feed line; (ii) an external circulation circuit comprising means for determining properties of the slurry in the external circulation circuit and a heat exchanger; and (iii) a product withdrawal line, wherein—for any specific crystalline product and at any flow rate chosen in the external circulation circuit—the weight percentage of crystals of the crystalline product in the slurry in the external circulation circuit, ECCWPC, is controlled by said means for determining properties of the slurry within a specified and predetermined narrow range having a maximum and minimum value not more apart than at most 25% by weight and falling within the range of from 1 to 50% by weight.
    Type: Application
    Filed: July 19, 2007
    Publication date: February 4, 2010
    Inventor: Geert Ekkelenkamp
  • Patent number: 7637965
    Abstract: A process for operating a hydraulic wash column, in which the position of the buildup front in the wash column is positioned by means of the flow rates of control liquor conducted into the wash column and/or by means of the flow rate of the suspension conducted into the wash column, and the flow rate determination is with the aid of the pressure difference which exists in the column between points in the suspension zone disposed upstream of the buildup front and points in the zone projecting from the buildup front up to the end of the crystal bed.
    Type: Grant
    Filed: April 10, 2006
    Date of Patent: December 29, 2009
    Assignee: BASF Aktiengesellschaft
    Inventors: Joerg Heilek, Klaus Joachim Mueller-Engel, Ulrich Hammon, Thomas Walter
  • Patent number: 7520932
    Abstract: A method of analyzing carbon concentration in crystalline silicon includes providing a section from a zoned and annealed silicon core. The zoned and annealed core is extracted from a polycrystalline silicon composition and has a columnar shape. The zoned and annealed core includes a single crystalline silicon region and a freeze-out melt region. The freeze-out melt region is disposed adjacent to the single crystalline silicon region, and the regions are spaced along a length of the columnar shape. Specifically, the section is provided from the freeze-out melt region, with the entire freeze-out melt region in the section. A carbon concentration of the section is determined. By providing the section from the freeze-out melt region, as opposed to the polycrystalline silicon composition, determination of carbon concentration in the crystalline silicon is enabled with a sensitivity at less than or equal to 10 parts per billion atomic.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: April 21, 2009
    Assignee: Dow Corning Corporation
    Inventor: Doug Kreszowski
  • Publication number: 20090000080
    Abstract: A solid hollow fiber cooling crystallizer and method for crystallizing aqueous and organic solutions are provided. The solid hollow fiber crystallizer (SHFC) for carrying out cooling crystallization of inorganic/organic microsolutes/macrosolutes from solution generally includes a bundle of non-porous hollow fibers mounted within a shell where a feed solution for crystallization flows through the lumen side of the hollow fibers and a cooling solution flows through the shell side to form nuclei and subsequently crystals in the feed solution at a temperature below its saturation temperature. The solid hollow fiber crystallizer may be combined with a mixing device, such as a completely stirred tank or static mixer, to further effectuate crystallization. The solid hollow fiber crystallizer may be operated in a number of modes including feed recycle mode, once through mode, SHFC-in-line static mixer in series mode, and SHFC-CST in series mode.
    Type: Application
    Filed: May 2, 2008
    Publication date: January 1, 2009
    Applicant: NEW JERSEY INSTITUTE OF TECHNOLOGY
    Inventors: Kamalesh K. Sirkar, Dimitrios Zarkadas
  • Patent number: 7438729
    Abstract: In order to produce granules granulometrically polidispersed in a very little range, a fluid bed granulation process of the type comprising the steps of preparing a fluid bed of seeds (S1) of the substance to be granulated, having a free surface (P) substantially horizontal; and feeding a continuous flow (L) of a fluid comprising a growth liquid, provides in the fluid bed for a continuous vortex (V) with a substantially horizontal axis, in which an upper zone (Z1) of seeds wetting and evaporation of possible solvent contained in the flow (L) and a lower zone (Z2) of solidification/consolidation of the growth liquid are identified.
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: October 21, 2008
    Assignee: Urea Casale S.A.
    Inventor: Gianfranco Bedetti
  • Publication number: 20080229549
    Abstract: This disclosure pertains to a process for making single crystal Group III nitride, particularly gallium nitride, at low pressure and temperature, in the region of the phase diagram of Group III nitride where Group III nitride is thermodynamically stable comprises a charge in the reaction vessel of (a) Group III nitride material as a source, (b) a barrier of solvent interposed between said source of Group III nitride and the deposition site, the solvent being prepared from the lithium nitride (Li3N) combined with barium fluoride (BaF2), or lithium nitride combined with barium fluoride and lithium fluoride (LiF) composition, heating the solvent to render it molten, dissolution of the source of GaN material in the molten solvent and following precipitation of GaN single crystals either self seeded or on the seed, maintaining conditions and then precipitating out.
    Type: Application
    Filed: April 25, 2008
    Publication date: September 25, 2008
    Inventors: Boris N. Feigelson, Richard L. Henry
  • Publication number: 20080092340
    Abstract: The present invention concerns a method for the controlled precipitation of organic molecules which comprises the use of apparatus that is normally used in the field of photography.
    Type: Application
    Filed: July 19, 2005
    Publication date: April 24, 2008
    Inventors: Gertjan Bogels, Jan Bastiaan Bouwstra, Huib Van Boxtel
  • Patent number: 7357835
    Abstract: A crystalline material sufficiently pure for use in pharmaceuticals may be made by forming a saturated solution of the material, changing the temperature of the solution so it becomes supersaturated, and subjecting the solution to irradiation by high intensity ultrasound, the frequency of the ultrasound being scanned over a range of frequencies. For example the ultrasound may be varied between 19.5 and 20.5 kHz, and this variation may be sinusoidal. Preferably the ultrasound is provided only briefly, say for less than 5 s, before allowing the solution to cool gradually without further irradiation. The ultrasound may be applied using a vessel with an array of ultrasonic transducers attached to a wall, so each transducer radiates no more than 3 W/cm2 yet the power dissipation within the vessel is between 25 and 150 W/litre. This method can reduce the metastable zone width to less than 10 K. It is applicable in particular to aspartame.
    Type: Grant
    Filed: May 13, 2003
    Date of Patent: April 15, 2008
    Assignee: Accentus PLC
    Inventors: Linda Jane McCausland, John Patrick Perkins
  • Patent number: 7270752
    Abstract: A process is described for purifying lactams, in particular the lactams obtained by cyclizing hydrolysis of an aminoalkylnitrile, and more particularly to the purification by crystallization of ?-caprolactam obtained by cyclizing hydrolysis of aminocapronitrile. This crystallization is carried out on the cyclization reaction medium after hydrogenation, removal of volatile compounds, and treatment with an ion-exchange resin.
    Type: Grant
    Filed: December 27, 2000
    Date of Patent: September 18, 2007
    Assignee: Rhodia Polyamide Intermediates
    Inventors: Philippe Carvin, Jean-Claude Masson
  • Patent number: 7011708
    Abstract: A device includes an agitation tank, a liquid circulation means for circulating a liquid along a tank wall of the agitation tank, and at least one auxiliary heat transfer means provided inside the agitation tank, wherein the auxiliary heat transfer means is constantly put in a wetted state.
    Type: Grant
    Filed: September 17, 2001
    Date of Patent: March 14, 2006
    Assignee: Kansai Chemical Engineering Co. Ltd.
    Inventors: Hideo Noda, Hiroshi Ooshima, Takaya Inoue, Hiroaki Ueda
  • Patent number: 6881231
    Abstract: A composition for reducing deposition of a mineral salt from an aqueous supersaturated solution onto a solid surface in contact with the aqueous supersaturated solution which composition comprises a dispersion of either (i) seed crystals of the mineral salt in an aqueous solution of the mineral salt or (ii) seed crystals of a salt isomorphous with the mineral salt in an aqueous solution of the isomorphous salt wherein the dispersed seed crystals are of Mean particle size of less than 2.5 microns.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: April 19, 2005
    Assignees: BP Exploration Operating Company Limited, Asymptote Limited
    Inventors: Elizabeth Acton, George John Morris
  • Patent number: 6855176
    Abstract: A method for purifying substances through emulsion crystallisation is described, whereby (a) an emulsion of organic liquid droplets in a continuous water phase containing the impure substance is formed; (b) the emulsion is super-saturated in the substance; (c) crystallisation of the substance in the water phase is induced; (d) the crystals of the substance are isolated from the from emulsion, yielding an emulsion-filtrate; (e) additional impure substance is dissolved in the emulsion-filtrate; and (f) steps (b)-(d) are repeated with the emulsion obtained from step (e).
    Type: Grant
    Filed: March 8, 2000
    Date of Patent: February 15, 2005
    Assignee: Reuter Chemische Apparatebau KG [DE/DE]
    Inventor: Karl Reuter
  • Patent number: 6670036
    Abstract: There are disclosed a silicon seed crystal which is composed of silicon single crystal and used for the Czochralski method, wherein oxygen concentration in the seed crystal is 15 ppma (JEIDA) or less, a silicon seed crystal which is used for the Czochralski method, wherein the silicon seed crystal does not have a straight body, and a method for producing a silicon single crystal by the Czochralski method comprising using said seed crystal, bringing a tip end of the seed crystal into contact with a silicon melt to melt the tip end of the seed crystal, with or without performing necking operation, and growing a silicon single crystal. The method is capable of improving the rate of success in making crystals dislocation-free and the productivity of single crystal rods regardless of the use of necking operation.
    Type: Grant
    Filed: April 6, 1999
    Date of Patent: December 30, 2003
    Assignee: Shin-Etsu Handotai Co., Ltd.
    Inventors: Eiichi Iino, Masanori Kimura
  • Patent number: 6589906
    Abstract: Disclosed are methods for producing films of a composite comprising a metal oxide in combination with one or more other oxides or metals as a third component, or a composite comprising a metal oxide doped with metal ions as a third component, methods for producing titanium oxide coating layers having transparency, low peeling property and weather resistance, which are comparable to or even more excellent than those of conventional ones, as well as surface hardness comparable to that of coating films produced by using sintering, on plastic substrates, and methods for producing titanium oxide which exhibits photocatalytic activity even with light of visible light range. These methods do not require a treatment at a high temperature.
    Type: Grant
    Filed: January 11, 2002
    Date of Patent: July 8, 2003
    Assignee: Hoya Corporation
    Inventors: Koji Sato, Shigeaki Ohmi
  • Patent number: 6566490
    Abstract: Disclosed is a method for producing seeding microcrystals for the production of human insulin, the microcrystals being free of non-human pancreatic insulin, the method comprising providing an unseeded suspension of human insulin, the suspension being free of non-human pancreatic insulin, and homogenizing the insulin suspension under pressure to result in human insulin microcrystals suitable for use as seeding microcrystals for the production of zinc insulin products. The method of homogenization under pressure may also be used for the production of seeding mnicrocrystals for other peptides and proteins, in particular pharmaceutical peptides or proteins such as insulin, GLP-1, glucagon and growth hormones.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: May 20, 2003
    Assignee: Novo Nordisk A/S
    Inventors: Flemming Manique, Christian Ilsoe
  • Patent number: 6478828
    Abstract: A process for crystallization of an inorganic substance includes preparing a supersaturated solution of the inorganic substance to be crystallized in a solvent which is a liquid; forcing a stream of the supersaturated solution upwardly through successively a fluidized bed distributor of a fluidized bed reactor and a bed of crystals arranged above the fluidized bed distributor with a pressure effective to cause fluidization of the bed of crystals, the fluidized bed distributor dividing the stream of supersaturated solution into thin, substantially parallel and vertical jets; maintaining the fluidized bed distributor at a temperature which is uniform and at which the inorganic substance to be crystallized from the supersaturated solution is lower than or equal to the concentration corresponding to saturation; and controlling the temperature of the fluidized bed distributor to cause the stream of supersaturated solution in the fluidized bed distributor to undergo a temperature change which is insufficient to des
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: November 12, 2002
    Assignee: Solvay & Cie (Société Anonyme)
    Inventors: Léon Ninane, Léopold Detry
  • Patent number: 6464736
    Abstract: The present invention provides a process for producing crystals of a polymorphic compound in a first crystal structure by introduction of the compound in a second crystal structure into a saturated brine solution of the compound under conditions in which formation of the first crystal structure is favored and without evaporation or changes in temperature. As the second crystal structure dissolves, the brine becomes supersaturated resulting in relief of supersaturation by formation of crystals of the first crystal structure. The process includes controlling supersaturation and its relief to achieve growth of existing crystals of the first crystal structure rather than nucleation and formation of new crystals. The resulting crystals are separated from insoluble impurities on a size separation basis.
    Type: Grant
    Filed: March 9, 2000
    Date of Patent: October 15, 2002
    Assignee: Environmental Projects, Inc.
    Inventors: Wayne C. Hazen, Dale Lee Denham, Jr., David R. Baughman, Rudolph Pruszko
  • Patent number: 6428583
    Abstract: A crystallization process is described for separating a desired substance from an aggregate mixture in which an emulsion of droplets in a continuous phase containing the aggregate mixture is formed and supersaturated, characterized in that the emulsion is seeded with seed crystals of the desired substance and seed crystals of at least one other substance in the aggregate mixture to effect crystallization of the desired substance and the other substance(s) in the continuous phase. Also described are substances separated by the process, and devices for carrying out the process.
    Type: Grant
    Filed: April 27, 2000
    Date of Patent: August 6, 2002
    Assignee: Reuter Chemische Apparatebau KG
    Inventor: Karl Reuter
  • Patent number: 6383233
    Abstract: A process is described for separating a desired substance from an aggregate mixture in which process a three-phase dispersion is formed, the first phase comprising droplets phase comprising a liquid transport phase, and the third phase comprising a surface upon which the desired substance can crystallize, whereby a chemical potential exists for crystal growth of the desired substance in the third phase thereby creating a flow of the desired substance from the first phase through the second phase to the third phase where the desired substance crystallizes, characterized in that the Gibb's free enthalpy of formation (&Dgr;G) of the droplets is <0.
    Type: Grant
    Filed: January 19, 1999
    Date of Patent: May 7, 2002
    Assignee: Reuter Chemicscher Apparatebau KG
    Inventor: Karl Reuter
  • Patent number: 6364914
    Abstract: Herein is disclosed a method of crystallization with the particle size distribution being controlled, characterized in that while crystals are being precipitated by vacuum concentration crystallization, the temperature of the slurry is periodically varied up and down during the concentration of the crystallization mother liquor (i.e., the slurry), which method is an excellent one free from the defects of the conventional methods.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: April 2, 2002
    Assignee: Ajinomoto Co., Inc.
    Inventors: Hiroshi Ueda, Hiroshi Fukushi, Muneyuki Ozawa
  • Patent number: 6334878
    Abstract: An apparatus for crystallization, which contains a crystallization vessel, a seed supplying device, a feed solution supplying device and a tube baffle disposed within the crystallization vessel. The tube baffle is provided with a crystallization portion in an inner area and a lower area thereof, and the tube baffle and the crystallization vessel define a classification portion there between. The apparatus further contains an agitating fan for agitating the seed crystals and the feed solution, and a plurality of plate baffles disposed within the classification portion which define a buffer portion and a gravitational settling portion. The apparatus further contains a device for generating a rising velocity of a slurry containing fine crystals in the gravitational settling portion by discharging the slurry so that the rising velocity of the slurry is greater than a settling velocity of the fine crystals and an outlet for discharging the crystallized material.
    Type: Grant
    Filed: August 27, 1999
    Date of Patent: January 1, 2002
    Assignee: Ajinomoto Co., Inc.
    Inventors: Ichiro Miyahara, Tatsuo Kitamura, Masato Yokoyama, Takashi Koko
  • Patent number: 6315966
    Abstract: Continuously operated, two-part crystallizer which is particularly suitable for the resolution of racemic mixtures, and process for separating solid mixtures which are difficult to separate, in particular racemates.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: November 13, 2001
    Assignee: Haarmann & Reimer GmbH
    Inventors: Hans-Dieter Baumgard, Bernhard Haedke, Josef Himmelreich, Helmut Judat
  • Patent number: 6267789
    Abstract: Process for enriching crude salt, in which the crude salt is ground and then cooled in a saturated aqueous sodium chloride solution, to a temperature below the anhydrous sodium chloride to sodium chloride dihydrate transition temperature, a stock of a powder comprising sodium chloride crystals is collected from the cooling step and the powder is subjected to particle-size fractionation from which a fine particle-size fraction and a coarse particle-size fraction comprising the enriched salt are collected.
    Type: Grant
    Filed: October 12, 1999
    Date of Patent: July 31, 2001
    Assignee: Solvay (Société Anonyme)
    Inventor: Léon Ninane
  • Patent number: 6251358
    Abstract: Process for the preparation of sodium fluoride from sodium hydroxide solution and hydrogen fluoride or hydrofluoric acid, characterized in that <45% strength by weight, preferably 20 to 40% strength by weight, sodium hydroxide solution and hydrogen fluoride or hydrofluoric acid are introduced separately into a saturated NaF solution in which 4 to 50% by weight, preferably 5 to 30% by weight, of solid NaF are suspended and whose temperature is in the range from 20 to 80° C., preferably 30 to 60° C.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: June 26, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Günter Lailach, Andreas Bulan, Günter Buss
  • Patent number: 6251182
    Abstract: The present invention is an improved susceptor for a float-zone apparatus for the float-zone processing of silicon elements. The susceptor is of a cylindrical design which allows the susceptor to be positioned around a free end of a silicon element to heat the free end of the silicon element to facilitate inductive coupling of the free end of the silicon element with an RF induction coil heater. In a preferred embodiment of the present invention, the susceptor is formed from tantalum.
    Type: Grant
    Filed: May 11, 1993
    Date of Patent: June 26, 2001
    Assignee: Hemlock Semiconductor Corporation
    Inventors: Joaquin Enrique Luna, Scott Allen Wheelock
  • Publication number: 20010000546
    Abstract: The present invention relates to a process for the manufacture of particles comprising magnesium chloride, which may serve as a support for a catalytic component for the polymerization of olefins, this process comprising a step of placing in contact between solid particles, an organomagnesium derivative and a chlorinating agent for the organomagnesium derivative. The process affords excellent control over the morphology of the support particles, particles of catalytic component and polymer particles.
    Type: Application
    Filed: December 18, 2000
    Publication date: May 3, 2001
    Applicant: ELF ATOCHEM S.A.
    Inventor: Claude Brun
  • Patent number: 6113657
    Abstract: In a process for preparing crystalline NaOH.3.5H.sub.2 O, NaOH.3.5H.sub.2 O is allowed to crystallize from an aqueous sodium hydroxide solution which contains sodium chloride and is saturated in respect of NaOH.3.5H.sub.2 O and the crystals formed are separated from the solution using a mechanical solid/liquid separation apparatus, wherein the solid/liquid separation is carried out under conditions under which the crystalline NaOH.3.5H.sub.2 O is freed sufficiently of residual solution adhering to the surface for the sodium chloride content of the crystalline NaOH.3.5H.sub.2 O obtained to be less than 100 mg per kg. The crystalline NaOH.3.5H.sub.2 O is subjected to an additional purification step, which may include the at least superficial melting or the at least superficial dissolution of the crystals, in combination with a solid/liquid separation step. The additional purification step. The additional purification step comprises washing the crystalline NaOH.3.5H.sub.2 O separated off.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: September 5, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Dieter Schlafer, Michael Mauss, Matthias Rauls, Dieter Baumann
  • Patent number: 6106794
    Abstract: Process for the preparation of sodium fluoride from sodium hydroxide solution and hydrogen fluoride, characterized in that at least 45% strength by weight, in particular 50% strength by weight, sodium hydroxide solution and anhydrous hydrogen fluoride are introduced separately into a saturated NaF solution in which 4 to 50% by weight, preferably 5 to 30% by weight, solid NaF are suspended and the temperature of which is in the range from 20 to 80.degree. C., preferably 30 to 60.degree. C.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: August 22, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gunter Lailach, Andreas Bulan, Gunter Buss
  • Patent number: 6080210
    Abstract: A process for producing aluminum fluoride particles having a smooth surface, comprising the steps of adding aluminum fluoride seed crystals to a super-saturated solution of aluminium fluoride; allowing aluminum fluoride particles to be precipitated under heating and agitation; collecting the aluminium fluoride particles by filtration; and drying them, wherein: a super-saturated solution of aluminium fluoride containing 0.6 to 1.3 wt % of fluosilicic acid which is preferably obtained by reacting aluminum hydroxide with fluosilicic acid in an [Al(OH).sub.3 /H.sub.2 SiF.sub.6 ] molar ratio of 1.80 to 1.90 is used as the crystallization mother liquor.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: June 27, 2000
    Assignee: Onoda Chemical Industry Co., Ltd.
    Inventors: Motohiko Asano, Toyohiro Nawata, Masahiro Numata, Koji Okamoto, Takashi Goda, Kazuyoshi Kamata
  • Patent number: 5985165
    Abstract: The present invention allows the reproduction of a crystalline aluminum hydroxide having a high particle strength and a high purity which can find wide application such as abrasive from a supersaturated sodium aluminate solution which is being recycled in the production of aluminum hydroxide or lithographic printing plate. In a process for the purification of aluminum hydroxide which comprises the hydrolysis reaction of a supersaturated solution of sodium aluminate to crystallize aluminum hydroxide, the improvement which comprises the steps of keeping the temperature of a suspension formed by mixing a mother liquor having a total caustic soda concentration of from 50 to 700 g/l and an aluminum concentration or from 0 to 300 g/l with crystalline aluminum hydroxide at a range of from 10.degree. C. to 200.degree. C. for at least 1 to 48 hours, mixing the suspension with the supersaturated solution of sodium aluminate, and then causing the crystallization reaction at the crystallization reaction temperature.
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: November 16, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroshi Fukuta, Tsutomu Kakei, Tadabumi Tomita, Hideki Miwa
  • Patent number: 5879647
    Abstract: An improvement is proposed in the so-called urea method for the preparation of fine particles of yttrium oxide, according to which, while an aqueous reaction mixture containing a water-soluble yttrium salt, e.g., nitrate, and urea dissolved therein in specified concentrations is heated at 90.degree. to 100.degree. C. to effect precipitation of yttrium carbonate hydroxide particles followed by calcination of the carbonate hydroxide in air into yttrium oxide, the aqueous reaction mixture is diluted with addition of a specified volume of preheated water within a critical period between incipient appearance of turbidity in the reaction mixture by the precipitation of the carbonate hydroxide and a moment 30 minutes thereafter. In this way, the yttrium oxide particles obtained have a globular particle configuration with a very small average particle diameter D.sub.50 in the range from 0.1 to 0.3 .mu.m and are suitable for use in various fine applications.
    Type: Grant
    Filed: November 13, 1997
    Date of Patent: March 9, 1999
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Kazuhiro Wataya, Shigeru Sakai
  • Patent number: 5814231
    Abstract: A process for separating a liquid eutectic mixture by crystallization of one eutectic forming substance of the mixture on a cold surface to which seed crystals of the eutectic forming substance have been applied in the form of a seed crystal layer, and subsequent removal of the eutectic forming substance in liquid form after heating of the surface.
    Type: Grant
    Filed: September 9, 1996
    Date of Patent: September 29, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Klaus Borho, Jorg Heilek, Gunter Schnabel
  • Patent number: 5776864
    Abstract: A method of fabricating bulk YBa.sub.2 Cu.sub.3 O.sub.x where compressed powder oxides and/or carbonates of Y and Ba and Cu present in mole ratios to form YBa.sub.2 Cu.sub.3 O.sub.x are heated in the presence of a Nd.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.y seed crystal to a temperature sufficient to form a liquid phase in the YBa.sub.2 Cu.sub.3 O.sub.x while maintaining the seed crystal solid. The materials are slowly cooled to provide a YBa.sub.2 Cu.sub.3 O.sub.x material having a predetermined number of domains between 1 and 5. Crack-free single domain materials can be formed using either plate shaped seed crystals or cube shaped seed crystals with a pedestal of preferential orientation material.
    Type: Grant
    Filed: April 1, 1997
    Date of Patent: July 7, 1998
    Assignee: The University of Chicago
    Inventors: Volker Todt, Dean J. Miller, Donglu Shi, Suvankar Sengupta
  • Patent number: 5755975
    Abstract: In a process for separating substances from a liquid mixture by crystallization in a crystallizer, a two-phase seed layer in the form of a melt or solution of the mixture to be separated, with crystals suspended therein, is applied, prior to the crystallization, to those surfaces of the crystallizer from which crystals grow during the crystallization.
    Type: Grant
    Filed: September 9, 1996
    Date of Patent: May 26, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Bernd Eck, Bernhard Maltry
  • Patent number: 5707406
    Abstract: A method of manufacturing aluminum fluoride anhydride by means of a wet method. This method is featured in that a seed crystal of AlF.sub.3.3H.sub.2 O containing not more than 5% of fine particle 40 .mu.m or less in diameter is added into the super-saturated solution of aluminum fluoride in such a ratio that the total surface area of the seed crystal is in the range of 40-100 m.sup.2 per 1 kg of AlF.sub.3.3H.sub.2 O to be precipitated until an initial concentration of the super-saturated solution is reduced to 1.6%. The initial concentration of the super-saturated solution is adjusted to 8 to 15%. Resultant slurry is heated under agitation, thereby precipitating in batch-wise large AlF.sub.3.3H.sub.2 O particles which are then separated, dried and dehydrated.
    Type: Grant
    Filed: January 29, 1997
    Date of Patent: January 13, 1998
    Assignee: Onoda Chemical Industry Co., Ltd.
    Inventors: Motohiko Asano, Masahiro Numata, Koji Okamoto, Takashi Goda
  • Patent number: 5690700
    Abstract: A process for the precipitation of aluminum trihydroxide from a supersaturated sodium aluminate solution, comprising the steps of(a) supplying a stream of supersaturated sodium aluminate solution and a first stream of aluminum trihydroxide particles as seed particles to a first reaction circuit,(b) maintaining the sodium aluminate stream containing the stream of seed particles in the first reaction circuit under conditions mainly resulting in precipitation and agglomeration of aluminum trihydroxide,(c) passing the stream thus obtained to a second reaction circuit in which the stream is maintained under conditions mainly resulting in precipitation and growth of aluminum trihydroxide particles,(d) passing the stream obtained in the second reaction circuit to a separation/classification unit to separate the stream into a first aluminum trihydroxide product stream comprising the coarser particle size portion, a second aluminum trihydroxide product stream comprising the finer particle size portion and a spent liqu
    Type: Grant
    Filed: November 28, 1995
    Date of Patent: November 25, 1997
    Assignee: Billiton Intellectual Property B.V.
    Inventor: Iwan Dilip Kumar Hiralal
  • Patent number: 5575923
    Abstract: An improved salt basket for dewatering solids, particularly salts resulting from evaporation of industrial wastewaters. The salt basket system includes a pressurizable vessel having a screen floor situated above a bottom liquid collection head, an inlet for the brine/solids slurry from which solids are to be separated and dried, an inlet for air, an inlet for steam (the latter two inlets may be combined, where convenient), an inlet for solids free feed, and a drain outlet (these two may be combined where convenient into a combination feed/drain connection). Preferably, an automated system for introducing feed brine and for removing the solids product is provided. For safety, a pivotally attached lower door has a hydraulic failsafe closure mechanism and locking safety latches to prevent the door from inadvertently opening.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 19, 1996
    Assignee: Ionics, Incorporated
    Inventors: Robert L. Solomon, Ferris C. Standiford, Joseph Bostjancic, Dan Peterson, George R. Jones
  • Patent number: 5503641
    Abstract: A potassium chloride mixture with grains of different sizes is extracted in a first stage with an unsaturated solution at an elevated temperature, whereby the finest grains are completely dissolved and the coarse proportions are caused to start dissolution, the purified medium fraction is transported into a second process stage and the previously dissolved amount of KCl is crystallized there onto the purified grains at a lower temperature, forming a product of high purity with a balanced grain size and a narrow grain spectrum.
    Type: Grant
    Filed: June 2, 1994
    Date of Patent: April 2, 1996
    Assignee: Kali und Salz Beteiligungs AG
    Inventors: Ivan Bakardjiev, Hans W. Beher, Ingo Stahl