Patents Assigned to Nalco Chemical Company
  • Method of achieving microbiological control in open recirculating cooling water
    Patent number: 5603840
    Abstract: The invention comprises adding bromide to a cooling water system containing corrosion and scale control treatment chemicals at elevated concentrations (40 ppm or greater). A fraction of the recirculating water is drawn off in a side stream and ozonated. Ozone oxidizes bromide to bromine which then serves as a biocide. The bromide levels are chosen such that the ozone/bromide reaction is preferred over the ozone/treatment chemicals reaction. Thus, the addition of bromide at elevated concentrations, while acting as a biocide precursor, serves to protect treatment chemicals necessary for corrosion and scale control.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: February 18, 1997
    Assignee: Nalco Chemical Company
    Inventors: Richard J. Strittmatter, Narasimha M. Rao
  • Hydrophobically modified polymers for sludge dewatering
    Patent number: 5601725
    Abstract: A method for the dewatering of sludges in industrial waste waters utilizing a hydrophobically-modified coagulant copolymer of diallyldimethyl ammonium chloride and quaternized dimethylaminoethyl acrylate or quaternized dimethylaminoethylmethacrylate and a flocculant.
    Type: Grant
    Filed: October 23, 1995
    Date of Patent: February 11, 1997
    Assignee: Nalco Chemical Company
    Inventors: Daniel K. Chung, Chandrashekar S. Shetty, Manian Ramesh
  • Hydrophobically associating dispersants used in forming polymer dispersions
    Patent number: 5597858
    Abstract: An improved process for the preparing a dispersions of water soluble cationic polymers in an aqueous salt solution is disclosed. The improvement comprises using as a polymeric dispersion stabilizer a water soluble hydrophobically associating copolymer of diallyldimethylammonium chloride and a monomer selected from the group consisting of: ##STR1## and alkyl esters of acrylic acid, where R.sub.1 is either hydrogen or CH.sub.3 ; R.sub.2 and R.sub.3 are each an alkyl group having 1 to 3 carbon atoms; A.sub.1 is either an oxygen atom or NH; B.sub.1 is either an alkylene group having 2 to 4 carbon atoms or a hydroxypropylene group, Q is benzyl, or C.sub.6 -C.sub.20 alkyl, and X.sub.1.sup.- is an anionic counterion.
    Type: Grant
    Filed: March 22, 1995
    Date of Patent: January 28, 1997
    Assignee: Nalco Chemical Company
    Inventors: Manian Ramesh, Jeffrey R. Cramm, Darrell L. Werges, Christopher P. Howland
  • DADMAC/vinyl trialkoxysilane copolymers for dewatering copper and taconite slurries in the mining industry
    Patent number: 5597475
    Abstract: A method for dewatering mineral slurries employing a copolymer of diallyldimethlylammonium halide and a vinyl alkoxysilane, which is preferably a copolymer of diallyldimethylammonium chloride and vinyltrimethoxysilane as a coagulant is disclosed. The method for dewatering mineral slurries containing water comprising the steps of: feeding said mineral slurry into a thickener, treating said mineral slurry with an effective amount of a coagulant which comprises a copolymer of halide and a vinyl alkoxysilane; allowing the water to separate from the mineral slurry, withdrawing the water from said thickener and discharging said mineral products from said thickener. Mineral slurries which can be effectively treated are copper and taconite. The above-mentioned method may also include treatment with a flocculant in conjunction with the coagulant.
    Type: Grant
    Filed: July 28, 1995
    Date of Patent: January 28, 1997
    Assignee: Nalco Chemical Company
    Inventors: E. Michael Kerr, Manian Ramesh
  • DADMAC/vinyl trialkoxysilane copolymers for treatment of food processing wastes
    Patent number: 5597490
    Abstract: The present invention relates generally to the treatment of food processing wastes. More particularly, the present invention provides a chemical treatment method that effectively removes fat, blood, tissue and other solids from food processing waste, using novel hydrophobically associating copolymer compositions. These polyelectrolyte compositions are water soluble silicon containing copolymers prepared from dialkyldiallyl ammonium halides, particularly diallyldimethyl ammonium chloride (DADMAC) and vinyl alkoxysilanes, preferably vinyltrimethoxysilane (VTMS).
    Type: Grant
    Filed: August 31, 1995
    Date of Patent: January 28, 1997
    Assignee: Nalco Chemical Company
    Inventors: Daniel K. Chung, Manian Ramesh
  • Method for reducing pitch deposition using copolymer of N-vinyl acetamide
    Patent number: 5597448
    Abstract: Pitch in paper mills is controlled by treating paper mill systems with a water soluble polymer which contains a lower alkyl N-vinyl amide or a hydrolyzed lower alkyl N-vinyl amide.
    Type: Grant
    Filed: May 16, 1995
    Date of Patent: January 28, 1997
    Assignee: Nalco Chemical Company
    Inventors: Peter E. Reed, Carol S. Greer
  • Seed process for salt dispersion polymer
    Patent number: 5597859
    Abstract: A novel dispersant system is disclosed for use in forming dialkylaminoalkyl (meth)acylamide polymer dispersions.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: January 28, 1997
    Assignee: Nalco Chemical Company
    Inventors: John R. Hurlock, Manian Ramesh
  • Papermaking process
    Patent number: 5595629
    Abstract: A papermaking process comprising forming an aqueous cellulosic papermaking slurry and adding a cationic polymer and an anionic polymer to the slurry to increase retention and/or drainage is disclosed. The anionic polymer comprises a formaldehyde condensate of a naphthalene sulfonic acid salt (NSF) with a molecular weight range of 500 to 120,000, while the cationic polymer has a molecular weight range of from 500,000 to 20 million. After addition of the polymers, the slurry is drained to form a sheet, and the sheet is dried.
    Type: Grant
    Filed: September 22, 1995
    Date of Patent: January 21, 1997
    Assignee: Nalco Chemical Company
    Inventor: Arthur J. Begala
  • Monitoring of industrial water quality using monoclonal antibodies to polymers
    Patent number: 5593850
    Abstract: The invention provides methods and compositions for monitoring chemicals used to prevent corrosion in industrial water containers. The invention is useful for chemicals such as polymers, in particular water soluble, vinyl polymers. Monoclonal antibodies are used in assays to determine the presence or concentration of the chemicals in a fluid, in particular water used in industrial systems.
    Type: Grant
    Filed: October 4, 1993
    Date of Patent: January 14, 1997
    Assignee: Nalco Chemical Company
    Inventors: Robert L. Wetegrove, Krishna Balakrishnan, Richard E. Bruehl
  • Coker/visbreaker and ethylene furnace antifoulant
    Patent number: 5593568
    Abstract: Fouling on the surfaces of equipment used in the high temperature processing of petroleum feedstocks can be controlled by treating the petroleum feedstocks with at least 5 ppm of tri-t-butylphenol phosphate ester.
    Type: Grant
    Filed: April 26, 1995
    Date of Patent: January 14, 1997
    Assignee: Nalco Chemical Company
    Inventor: Harald K. Lemke
  • Use of silicon containing polyelectrolytes in wastewater treatment
    Patent number: 5589075
    Abstract: The invention is a process for removing color from a paper mill waste effluent containing color bodies which comprises: treating the waste effluent containing color bodies with an effective color-removing amount of a water-soluble silicon-containing copolymer coagulant prepared from diallyldimethylammonium halide and a vinyltrialkoxysilane; coagulating the color bodies present in the waste effluent; and then removing the coagulated color bodies from the waste effluent.
    Type: Grant
    Filed: November 30, 1995
    Date of Patent: December 31, 1996
    Assignee: Nalco Chemical Company
    Inventors: Ananthasubramanian Sivakumar, John H. Collins, Manian Ramesh
  • Carbon steel corrosion inhibitors
    Patent number: 5589106
    Abstract: The prevention of corrosion on the surfaces of metallic pipes, heat exchangers, and the like which are in contact with industrial cooling waters, and particularly industrial cooling waters containing low levels of hardness is controlled utilizing a corrosion inhibiting amount of a composition including an alkali metal silicate, a hydroxycarboxylic acid or its water soluble salts, an organophosphonate, and a water soluble polymer which acts as a dispersant. Superior corrosion inhibition is achieved using the compositions of this invention as corrosion inhibitors, particularly in cooling water systems employing mild steel metallurgy.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: December 31, 1996
    Assignee: Nalco Chemical Company
    Inventors: Sang-Hea Shim, Dennis P. Bakalik, Donald A. Johnson, Bo Yang, Frank F. Lu
  • Method for preventing microbial deposits in the wet end of papermachines using ethylene oxide/propylene oxide copolymer
    Patent number: 5573641
    Abstract: A method of removing and preventing the build-up deposit-forming microorganisms in a papermachine fluid, the method comprising the step of treating the fluid with an aqueous, the aqueous solution including from about 0.1 to about 35 parts per million of an ethylene oxide/propylene oxide copolymer having a molecular weight of from about 2500 to about 3550 daltons.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: November 12, 1996
    Assignee: Nalco Chemical Company
    Inventors: Robert J. Meade, Linda R. Robertson, Nicole R. Taylor
  • Clarification of deinking process waters using polymers containing vinylamine
    Patent number: 5573675
    Abstract: The invention relates to the clarification of deinking process waters which result from the recycling of paper. More specifically, the present invention relates to the use of containing vinylamine as water clarifying agents in said processes.
    Type: Grant
    Filed: May 11, 1995
    Date of Patent: November 12, 1996
    Assignee: Nalco Chemical Company
    Inventors: Anthony G. Sommese, Karen R. Tubergen, Daniel K. Chung
  • Papermaking process with improved retention and maintained formation
    Patent number: 5571380
    Abstract: A process in which paper or paperboard is made by forming an aqueous cellulosic slurry, draining said slurry on a screen to form a sheet and drying said sheet, employs a cationic polymer as a substantially single component retention aid. The cationic polymer has a cationic charge density of at least about 3.2 equivalents of cationic nitrogen per kilogram of dry polymer. The cationic polymer also has an Intrinsic Viscosity of at least about 8 dl/g. The polymer is added to the slurry prior to sheet formation in an amount effective to provide at least about a 50 percent increase in retention without more than about a 10 percent decrease in formation.
    Type: Grant
    Filed: January 8, 1992
    Date of Patent: November 5, 1996
    Assignee: Nalco Chemical Company
    Inventor: Thomas C. Fallon
  • Demulsification of oily waste waters using silicon containing polymers
    Patent number: 5560832
    Abstract: A method of removing waste oil from industrial oily waste water is disclosed. The method comprises the steps of adding to the oily waste water which includes oil, dispersed solids and emulsified water, an effective amount of a demulsifier which comprises a copolymer of a cationic monomer and a vinyl alkoxysilane; allowing the oil, emulsified water and dispersed solids to flocculate and separate into layers; and then removing the water layer from the treated waste water. The cationic monomer is selected from the group consisting diallyldimethylammonium halide, dimethylaminoethyl acrylate quaternary salt and dimethylaminoethyl methacrylate quaternary salt.
    Type: Grant
    Filed: May 8, 1995
    Date of Patent: October 1, 1996
    Assignee: Nalco Chemical Company
    Inventors: Ananthasubramanian Sivakumar, Manian Ramesh
  • Steel mill flume water treatment
    Patent number: 5554298
    Abstract: The invention comprises a method of preventing deposition of oil on steel mill scale particles comprising adding from about 1 part per million to about 500 parts per million of an amine acrylate/acrylic acid copolymer to mill flume water. Once the copolymer is added, deposition of oil onto scale particles is prevented. The recovered mill scale has less than 2% oil by weight on the scale, making it suitable for recycle to the steelmaking process. Oil and water are subsequently separated with a greater percentage of oil being recovered.
    Type: Grant
    Filed: January 20, 1995
    Date of Patent: September 10, 1996
    Assignee: Nalco Chemical Company
    Inventors: Ronald D. Kochik, David A. Picco, Michael L. Braden, Kristine S. Salmen
  • Preparation of amphoteric acrylic acid copolymers suitable as oil-in-water emulsion breakers
    Patent number: 5552498
    Abstract: The invention comprise a composition for breaking oil-in-water emulsions comprising adding from about 1 part per million to about 500 parts per million of an amphoteric acrylic acid copolymer to the emulsion. Once the copolymer is added, the emulsion is subjected to agitation until the oil-in-water emulsion is resolved and the oil and water separates into two phases. The oil and water phases are then subjected to a separation technique to separate the phases. The invention further comprises a method of synthesizing the amphoteric polymers used in the emulsion breaking application.
    Type: Grant
    Filed: December 5, 1995
    Date of Patent: September 3, 1996
    Assignee: Nalco Chemical Company
    Inventor: Michael L. Braden
  • Phosphorus thioacid ester inhibitor for naphthenic acid corrosion
    Patent number: 5552085
    Abstract: Corrosion of the metallic surfaces of distillation columns, trays, packing, and pumparound piping used in the production of hydrocarbons can be controlled by adding a neutralized or non-neutralized thio-phosphate or thio-phosphite ester to the hydrocarbon distillate contacting the metallic surfaces.
    Type: Grant
    Filed: October 3, 1995
    Date of Patent: September 3, 1996
    Assignee: Nalco Chemical Company
    Inventor: Elizabeth Babaian-Kibala
  • Polymers containing phosphonic acid groups for the treatment of red mud in the Bayer process
    Patent number: 5534235
    Abstract: The invention comprises a process for improved flocculation of Bayer process red mud-containing slurry. The improvement comprises adding to the red mud-containing liquor a phosphonic acid polymer optionally in addition to the conventional flocculant. The polymer is added to the red mud-containing liquor in an amount sufficient to reduce the concentration of suspended solids in the supernatant phase and/or increase the rate of sedimentation.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: July 9, 1996
    Assignee: Nalco Chemical Company
    Inventors: Peter E. Reed, Robert P. Mahoney