Patents Represented by Attorney Steven D. Boyd

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  • Heap leach agglomeration/percolation extraction aids for enhanced gold and silver recovery
    Patent number: 6428597
    Abstract: Methods and compositions for increasing the recovery of precious metals from ore during heap leaching operations are disclosed. The methods add polypropylene glycol and alkylphenol ethoxylate in a paraffin oil solvent with the cyanide lixivant to the ore heap.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: August 6, 2002
    Assignee: BetzDearborn Inc.
    Inventor: Ricardo A. Cifuentes
  • Copper leach process aids
    Patent number: 6409799
    Abstract: Methods for enhancing the leaching of copper from copper bearing ores with an aqueous sulfuric acid leach solution are disclosed wherein an antifoam formulation stable at a solution pH of about 1 to 2 is added. A preferred antifoam formulation comprises a glycol ester and an alkyl phenol ethoxylate in a paraffinic oil solvent added to the aqueous sulfuric acid leach solution.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: June 25, 2002
    Assignee: Betzdearborn Inc. & Corporacion Nacional del Cobre de Chile
    Inventors: Ricardo Arancibia Cifuentes, Donald C. Roe, Jorge Vergara Chavez, Andres Reghezza Inzunza
  • Inhibition of corrosion in aqueous systems
    Patent number: 6379587
    Abstract: A method and composition for controlling corrosion of metals, particularly ferrous-based metals in contact with aqueous systems is disclosed, which includes treating industrial waters with a combination of (a) a tetrazolium salt of the general formula: wherein R1, R2 and R3 may be various organic or inorganic substituents, including monomers or oligomers of the above structure, and (b) polyacrylic or polymaleic acid.
    Type: Grant
    Filed: May 3, 1999
    Date of Patent: April 30, 2002
    Assignee: BetzDearborn Inc.
    Inventor: Longchun Chen
  • Inhibiting deposits in coke oven gas processing equipment
    Patent number: 6375831
    Abstract: A method of inhibiting and/or removing deposits from coke oven gas handling equipment is disclosed which comprises the addition of a treatment combination of a heterocyclic nitrogenous compound such as quinoline and 2-butoxyethanol to the flushing liquor used to cool coke oven effluent gases.
    Type: Grant
    Filed: February 1, 2000
    Date of Patent: April 23, 2002
    Assignee: BetzDearborn Inc.
    Inventors: Patrick J. Doyle, Terrence W. Mattioli, Gary S. Thundercliffe
  • Biocidal compositions and use thereof containing a synergistic mixture of glutaraldehyde and 2,2-dibromo-3 nitrilo propionamide
    Patent number: 6369104
    Abstract: A microbial inhibiting composition and method are disclosed. The composition comprises an amount, effective for the intended purpose, of glutaraldehyde and 2,2-dibromo-3-nitrilopropionamide. The method comprises administering between about 0.1 and 200 parts of this combined treatment (based on one million parts of the desired aqueous system) to the particular water containing system for which treatment is desired.
    Type: Grant
    Filed: July 17, 2000
    Date of Patent: April 9, 2002
    Assignee: Hercules Incorporated
    Inventors: Lynn G. Kleina, Wilson K. Whitekettle
  • Copper leach process aids
    Patent number: 6261341
    Abstract: A method for inhibiting crud formation and organic in aqueous solvent and aqueous in organic solvent entrainment in the solvent extraction of copper from an aqueous sulfuric acid pregnant leach solution is disclosed. The method comprises adding an antifoam formulation stable at a solution pH of about 1 to 2 is added. A preferred antifoam formulation comprises a glycol ester and an alkyl phenol ethoxylate in a paraffinic oil solvent added to the acid solution.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: July 17, 2001
    Assignees: BetzDearborn Inc., Corporacion Nacional del Cobre de Chile
    Inventors: Ricardo Arancibia Cifuentes, Donald C. Roe, Jorge Vergara Chavez, Andres Reghezza Inzunza
  • Copper leach process aids
    Patent number: 6258245
    Abstract: A method for enhancing the operation of an acid solvent extraction and electrowinning operation by inhibiting acidic aerosol formation, allowing increased acid concentration and allowing higher operating temperature is disclosed wherein an antifoam formulation stable at a solution pH of about 1 to 2 is added. A preferred antifoam formulation comprises a glycol ester and an alkyl phenol ethoxylate in a paraffinic oil solvent added to the acid solution of an acid solvent extraction and electrowinning operation.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: July 10, 2001
    Assignees: BetzDearborn Inc., Corporación Nacional del Cobre de Chile
    Inventors: Ricardo Arancibia Cifuentes, Donald C. Roe, Jorge Vergara Chavez, Andres Reghezza Inzunza
  • Treatment for the enhancement of bacterial exopolysaccharide recovery
    Patent number: 6251641
    Abstract: A treatment for enhancing the recovery of exopolysaccharide from bacterial cells is disclosed, which treatment includes adding to a cultivation medium containing said cells an amount, effective for the purpose of an alkylsulfosuccinate surfactant.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: June 26, 2001
    Assignee: BetzDearborn Inc.
    Inventor: J. Barry Wright
  • Softened brine treatment of crude oil
    Patent number: 6159374
    Abstract: A method for removing corrosive inorganic cations--such as calcium magnesium cations--from a crude oil stream by mixing the stream with a softened brine wash water that has been softened by removal or replacement of precipitating divalent or trivalent cations with non-precipitating cations. The crude oil stream and the wash water are mixed at a temperature from about 98.degree. C. to about 150.degree. C. to form an emulsion wherein the corrosive inorganic cations are transferred from the crude oil to the wash water, The emulsion is then broken to form a crude oil fraction and an aqueous fraction containing at least a portion of the corrosive inorganic cations from the crude oil. This method is particularly useful in areas where freshwater is not readily available.
    Type: Grant
    Filed: September 21, 1999
    Date of Patent: December 12, 2000
    Assignee: BetzDearborn Inc.
    Inventor: Paul R. Hart
  • Method for dispersing and removing sludge contained in a storage tank
    Patent number: 6142160
    Abstract: A method and apparatus for cleaning the interior of the storage tanks of the type used for storing large volumes of liquids, such as crude oil, wherein hydrocarbon sludge accumulates with the passage of time, such apparatus comprising concentric hallow pipes, a spray nozzle for injecting a flushing fluid, and connecting means including a packing gland which allows the concentric pipes to be movably oriented inside a storage tank through a manway. With this construction, a flushing fluid can be sprayed into a sludge layer in the storage tank through the inner pipe and sludge/flushing fluid withdrawn through the annular region between the concentric pipes. The packing gland in the connecting means, and a second packing gland between the inner and outer pipes allows for independent movement of the pipes within the storage tank.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: November 7, 2000
    Assignee: BetzDearborn Inc.
    Inventors: M. Craig Winslow, Larry J. Weber
  • Method and composition for corrosion and deposition inhibition in aqueous systems
    Patent number: 6126859
    Abstract: A method of stabilizing aqueous system solubility of a transition metal salt, polymeric agent corrosion/deposition control combination at neutral pH is disclosed. The addition of an aliphatic hydroxycarboxylic acid to such corrosion/deposition control combinations was found to enhance corrosion/deposition inhibition while providing for a stabile combination at neutral pH.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: October 3, 2000
    Assignee: BetzDearborn Inc.
    Inventors: Matthew M. Hunter, Gregory J. Pomrink, Stephen M. Kessler, Bruce K. Fillipo
  • Tube cleaner recovery system
    Patent number: 6116333
    Abstract: Apparatus for recovering floating hard-body tube cleaning elements from cooling water downstream of a heat exchanger. The floating hard-body tube cleaning elements are removed from the water flowing through a cooling tower distribution header and recovery from a modified distribution header vent.
    Type: Grant
    Filed: April 5, 1999
    Date of Patent: September 12, 2000
    Assignee: BetzDearborn Inc.
    Inventors: Robert P. Diem, James F. Echols
  • Halogen resistant copper corrosion inhibitors
    Patent number: 6103144
    Abstract: Non-halogen substituted, nitrogen containing, aromatic compounds are disclosed which are effective copper corrosion inhibitors in aqueous systems being treated with a halogen biocide. The materials of the present invention exhibit copper corrosion inhibition comparable to tolyltriazole in the absence of halogen, copper corrosion rates of less than about 2.5 mills per year in aqueous systems where halogen is present; and do not exhibit a detrimental effect on halogen demand in an aqueous system being treated.
    Type: Grant
    Filed: April 12, 1999
    Date of Patent: August 15, 2000
    Assignee: BetzDearborn Inc.
    Inventor: Longchun Cheng
  • Styrene caustic wash extraction aid
    Patent number: 6100439
    Abstract: Methods and compositions for improving the extraction of phenols from crude styrene using an aqueous caustic solution are disclosed. It has been discovered that aromatic or alkylammonium tailed multi-polyether headed surfactants and/or quaternary polyamines will improve this extraction, particularly in propylene oxide styrene monomer systems.
    Type: Grant
    Filed: December 14, 1998
    Date of Patent: August 8, 2000
    Assignee: BetzDearborn Inc.
    Inventor: Paul R. Hart
  • Method of adding coal combustion enhancer to blast furnace
    Patent number: 6077325
    Abstract: In the manufacture of iron in which coke and coal are added to a blast furnace during iron manufacture, an improvement for enhancing the operation of the furnace is disclosed. A metallic element in the form of a compound thereof, the metallic element selected from zirconium, chromium, molybdenum, tungsten, manganese, iron, cobalt, nickel, copper, zinc, aluminum, tin and lead is added to the coal, allowing for a reduction in the amount of coke added to the furnace.
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: June 20, 2000
    Assignee: BetzDearborn Inc.
    Inventors: Muthukumaraswamy Karanai Margan, Santanu Ghosh, Indronil Sengupta, James S. McNeill
  • Corrosion inhibitor for alkanolamine units
    Patent number: 6036888
    Abstract: The corrosion of metals in contact with aqueous alkanolamine solution in acid gas removal units is inhibited by adding to the alkanolamine solution a corrosion inhibiting amount of a sulfur containing heterocyclic ring compound. The ring compounds are useful for inhibiting the corrosion of metals in both the acid gas rich and the acid gas lean portions of the acid gas removal unit.
    Type: Grant
    Filed: August 22, 1997
    Date of Patent: March 14, 2000
    Assignee: BetzDearborn Inc.
    Inventor: Ljiljana V. Minevski
  • Aqueous dispersion polymers
    Patent number: 6020422
    Abstract: Water soluable, aqueous salt solution dispersible polymers and aqueous salt solutions containing dispersed polymers are produced by polymerization of ethylenically unsaturated soluble monomers in an aqueous salt solution in the presence of at least one carbohydrate. The polymers and aqueous salt solutions containing the dispersed polymers are useful for paper making, water clarification and emulsion breaking.
    Type: Grant
    Filed: November 15, 1996
    Date of Patent: February 1, 2000
    Assignee: BetzDearborn Inc.
    Inventors: Edward J. Connors, Michelle L. Cotter, Fu Chen
  • Apparatus and method for generating high quality foam using an air eductor
    Patent number: 6010083
    Abstract: A foam generating apparatus and system for generating high quality foam suitable for dust control is disclosed. The apparatus is an eductor that makes use of the energy of a high pressure stream of aqueous foaming solution to draw air into the foaming solution and force it through a foam generator. A dust control foam system is described which employs such air eductors. The described foaming system requires only a single pressurized line to supply foaming solution obviating the need for a compressed air line.
    Type: Grant
    Filed: October 16, 1998
    Date of Patent: January 4, 2000
    Assignee: BetzDearborn Inc.
    Inventors: Donald C. Roe, Ragula Bhaskar, Bradley J. Utzka
  • Corrosion inhibitor for alkanolamine units
    Patent number: 5985179
    Abstract: The corrosion of metals in contact with an aqueous alkanolamine solution in an acid gas removal unit is inhibited by adding a corrosion inhibiting amount of an alkanemonothiol or alkanedithiol compound to the aqueous alkanolamine solution. The alkanemonothiol and alkanedithiol compounds are useful for inhibiting the corrosion of metals in both the acid gas rich and lean portions of the acid gas removal unit.
    Type: Grant
    Filed: August 27, 1998
    Date of Patent: November 16, 1999
    Assignee: BetzDearborn, Inc.
    Inventors: Ljiljana V. Minevski, Ann L. Lambousy
  • Methods of inhibiting corrosion using isomers of chloro-methylbenzotriazole
    Patent number: 5968408
    Abstract: The use of halo-benzotriazoles as corrosion inhibitors in aqueous systems is disclosed. Specific isomers of chloro-methylbenzotriazole were found to be more effective corrosion inhibitors than tolyltriazole in the presence of chlorine.
    Type: Grant
    Filed: June 24, 1998
    Date of Patent: October 19, 1999
    Assignee: BetzDearborn Inc.
    Inventors: Sydia B. Anderson, Longchun Cheng, Michael A. Cady