Patents Represented by Attorney Andrew E. Barlay
  • Patent number: 4102981
    Abstract: Acidic impurity, such as HCl, is removed from chlorofluoromethanes of the formula CHCl.sub.n F.sub.3-n, where n is 1 or 2, by scrubbing the contaminated fluorocarbon with an aqueous solution made from a mixture of trisodium phosphate and sodium hydroxide. Use of this solution as scrubbing medium allows purification of the contaminated fluorocarbon without appreciable decomposition and also without generation of a significant quantity of environmentally objectionable waste stream of high phosphate content. The presence of NaOH in the scrubbing medium provides in situ regeneration of mono and disodium phosphates to trisodium phosphate.
    Type: Grant
    Filed: August 22, 1977
    Date of Patent: July 25, 1978
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventors: Elias A. Woychesin, Clovis P. Legleu, III
  • Patent number: 4077463
    Abstract: An improved cooling system is provided for hot, aqueous caustic solutions, such as received from evaporators employed for the concentration of electrolytically produced dilute caustic solutions. The improved cooling system consists of at least one closed loop circuit in which the hot caustic solution circulates under pressure and in the absence of air. The circuit includes suitable heat exchanger means, for example, a shell and tube device or other known heat transfer apparatus. The novel system not only allows the maintenance of controlled cooling rates, reduces scale formation on heat exchanger surfaces, improves caustic yield and quality due to lessening of carbonate formation but also improves the energy balance of the evaporation process.
    Type: Grant
    Filed: December 16, 1976
    Date of Patent: March 7, 1978
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventor: Philip Grosso
  • Patent number: 4076580
    Abstract: Cellulosic boards, such as hardboards, fiberboards and particle-boards, are flame retarded by incorporation of a synergistically acting alumina trihydrate-ulexite composition in the boards. The alumina trihydrate-ulexite flame-retarding agent provides a board of satisfactory strength properties with a flame spread at least equivalent to that of a commercial Class I-rated hardboard when the loading of the flame-retarding agent in the board is kept at 50% or below of the total weight of the flame-retarded board.
    Type: Grant
    Filed: March 24, 1977
    Date of Patent: February 28, 1978
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventors: Erwin Panusch, Igor Sobolev, Stephen C. Carniglia
  • Patent number: 4076603
    Abstract: Alkali metal hydroxide and chlorine are produced in a membrane-equipped electrolysis cell system in a staged manner wherein at least one cell of the system is used to generate a dilute caustic solution and wherein the subsequent cell(s) of the system are used to produce a more concentrated caustic solution by electrolysis of fresh brine and the dilute caustic produced in the first stage which is used in lieu of water in the subsequent stage(s). The stage-wise production of caustic of commercially acceptable concentration results in significant energy savings with corresponding increase in the average life of the membranes employed.
    Type: Grant
    Filed: April 7, 1977
    Date of Patent: February 28, 1978
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventor: John N. Andersen
  • Patent number: 4062696
    Abstract: Metallic and nonmetallic impurities are removed from contaminated alumina scavengers, such as employed for the purification of aluminum reduction cell effluents in dry scrubber systems, by preparing a slurry of the contaminated alumina and subjecting the slurry to an ultrasonic treatment. The treatment removes a significant quantity of the impurities, which will be dispersed in the liquid phase and can be readily separated from the purified alumina. The cleaned alumina is suitable for return to the dry scrubbing system or to be used as feed in the electrolytic aluminum reduction cells.
    Type: Grant
    Filed: July 27, 1976
    Date of Patent: December 13, 1977
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventor: Hebon J. Ducote
  • Patent number: 4045234
    Abstract: Sintered alumina of low porosity and Na content is made from calcined alumina of 2-6 micron average particle size and about 0.2-1% by weight Na.sub.2 O content by treating the calcined alumina with a synergistically acting combination of a magnesium salt and a boron compound. Suitable magnesium salts include magnesium halides, nitrate, sulfate, acetate and stearate, the water-soluble salts being preferred. As boron compound H.sub.3 BO.sub.3 or B.sub.2 O.sub.3 can be employed. The quantity of magnesium salt in the combination, calculated as Mg, is kept in the range of about 0.01-0.3% by weight of Al.sub.2 O.sub.3, while the boron content, calculated as B.sub.2 O.sub.3, is maintained in the range of about 0.1-1% by weight of Al.sub.2 O.sub.3. Used of the synergistically acting combination in the indicated range allows manufacture of sintered alumina products of less than about 3% total porosity and less than about 0.03% by weight Na content.
    Type: Grant
    Filed: August 23, 1976
    Date of Patent: August 30, 1977
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventor: Terry A. Ring
  • Patent number: 4042501
    Abstract: Iron containing aqueous, acidic solutions, such as acidic stripping solutions used to remove iron from organic extractants, are purified by subjecting the acidic solution to a hydrothermal treatment at elevated temperatures and pressures which cause the precipitation of the dissolved iron in easily separable form. The hydrothermal treatment is accomplished at temperatures in excess of about 100.degree. C. The process can be applied to acidic solutions containing the dissolved iron in the form of ferric sulfate, ferric nitrate or chloride and is particularly adaptable to acidic stripping solutions resulting from the purification of organic extractants employed to extract iron impurities from solutions obtained in the acid leaching of clays, ores and concentrates.
    Type: Grant
    Filed: July 2, 1976
    Date of Patent: August 16, 1977
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventor: William R. King
  • Patent number: 4036931
    Abstract: A process is provided which allows control of the impurity level of Bayer process streams with simultaneous generation of an environmentally acceptable effluent and recovery of valuable dissolved aluminum and sodium values. The process involves carbonation of a blow-down stream at 40.degree.-100.degree. C to produce sodium dawsonite [NaAl(OH).sub.2 CO.sub.2 ] and an effluent essentially free of dissolved alumina and significantly depleted in dissolved sodium. The sodium dawsonite can be used as such or returned to the Bayer process after thermal decomposition to sodium aluminate. The effluent can be directly discharged into natural receiving bodies without further treatment.
    Type: Grant
    Filed: June 25, 1976
    Date of Patent: July 19, 1977
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventors: Morris L. Roberson, John W. Beck, Jack S. Maples, Anthony Savariste, Donald J. Donaldson, David L. Stein, Allan C. Kelly
  • Patent number: 4008214
    Abstract: Flame-retardant cellulosic hardboards and particle boards are made by incorporating in the boards a synergistically acting flame-retarding composition containing at least about 30% by weight (calculated on the weight of the flame-retarded board) alumina hydrate in combination with one of the following compositions: melamine-formaldehyde-phosphate, urea-formaldehyde-phosphate or dicyandiamide-formaldehyde-phosphate.
    Type: Grant
    Filed: December 8, 1975
    Date of Patent: February 15, 1977
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventors: Igor Sobolev, Erwin Panusch
  • Patent number: 4001144
    Abstract: Modification of the pore volume distribution of an alumina base catalyst support is accomplished by treating an alumina precursor of chi-rho-eta structure with an aqueous ammonium carbonate or bicarbonate solution under pressure at about 100.degree.-160.degree. C for 10-24 hours, followed by drying and thermal activation at a temperature of at least about 500.degree. C. The resulting support will possess more than about 70% of its total pore volume in the 45-300 angstrom unit pore diameter range. This pore volume distribution renders it particularly suitable for use as a catalyst carrier for hydrodesulfurization purposes.
    Type: Grant
    Filed: December 19, 1975
    Date of Patent: January 4, 1977
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventors: Michael J. Pearson, Ronald J. Rigge, Stephen C. Carniglia
  • Patent number: 3998208
    Abstract: A device is provided for heating liquids, slurries and the like by direct condensation of steam. The device consists of a vertically oriented, substantially cylindrical elongated vessel, wherein liquid to be heated is introduced at the top and the heated liquid is removed at the bottom. The device is provided with at least one liquid treatment zone consisting of a perforated tray placed perpendicular to the downward flow of the liquid, a downwardly conveying cone-shaped underflow located below the tray and a hemispherical impingement surface positioned below the opening of the cone-shaped underflow. Steam is introduced in the zone at a point where the liquid exits from the underflow. This arrangement allows a maximum degree of heat exchange between the steam and the liquid without causing "hammering" due to excessive steam condensation.
    Type: Grant
    Filed: June 16, 1975
    Date of Patent: December 21, 1976
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventor: Harry I. Abboud
  • Patent number: 3961704
    Abstract: A wiper system for the removal of sticky and/or moist particulate material such as bauxite or clay from the working surface of endless conveyor belts comprised of a plurality of individually adjustable wipers arranged in parallel fashion at the return side or flite of the belt, located at an angle to the main axis of the belt and flexibly mounted relative to the belt.
    Type: Grant
    Filed: November 21, 1974
    Date of Patent: June 8, 1976
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventor: Beresford Eton Rochester
  • Patent number: 3951764
    Abstract: Aluminum-manganese alloys containing up to about 10.0% by weight manganese are made by reacting molten aluminum with a manganese oxide, such as MnO or MnO.sub.2, under a blanket of fluoridic salts, for example cryolite. The alloy can also be prepared by electrolyzing the oxides of aluminum and manganese in a fluoridic bath using aluminum metal as cathode.
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: April 20, 1976
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventor: William R. King