Patents Assigned to Nalco Chemical Company
  • Patent number: 6293973
    Abstract: A method is disclosed for controlling the precipitation of soluble sodium oxalate in Bayer process liquor which comprises adding a surface active quaternary ammonium compound to the Bayer process liquor and then subsequently adding a mixture of a hydrophobic oil and at least one surfactant.
    Type: Grant
    Filed: July 22, 1998
    Date of Patent: September 25, 2001
    Assignee: Nalco Chemical Company
    Inventors: Graeme J. Farquharson, John D. Kildea
  • Patent number: 6287473
    Abstract: Stable oxidizing bromine compounds are prepared by preparing a caustic solution comprising a halogen stabilizer, water and an alkali or alkaline earth metal hydroxide, the halogen stabilizer being selected from the group consisting of R—NH2, R—NH—R1, R—SO2—NH2, R—SO2—NHR1, R—CO—NH2, R—CO—NH—R1 and R—CO—NH—CO—R1 wherein R is a hydroxy group, an alkyl group or an aromatic group and R1 is an alkyl group or an aromatic group, adding bromine chloride to the solution while mixing the solution, and cooling the solution.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: September 11, 2001
    Assignee: Nalco Chemical Company
    Inventors: Shunong Yang, William F. McCoy, Anthony W. Dallmier
  • Patent number: 6280635
    Abstract: An autocycle method to control a cooling water system comprising the steps of: a) adding a treatment product to said cooling water system, with said treatment product comprising inert tracer and tagged treatment polymer in a set proportion; b) providing a sufficient number of fluorometers, c) using said sufficient number of fluorometers to measure the fluorescent signal of said inert tracer and the fluorescent signal of said tagged treatment polymer in the water from the cooling water system; d) using these measured fluorescent signals from step c) to determine the amount of said tagged treatment polymer present in said cooling water system; e) comparing the amount of said tagged treatment polymer present to the amount of tagged treatment polymer being fed into the system to determine the consumption of said tagged treatment polymer; and f) using said consumption of said tagged treatment polymer to control the concentration cycles of said cooling water system, with the proviso that said control is imple
    Type: Grant
    Filed: May 1, 2000
    Date of Patent: August 28, 2001
    Assignee: Nalco Chemical Company
    Inventors: Barbara E. Moriarty, Dennis P. Bakalik, Ronald V. Davis, John E. Hoots, Robert W. Shiely
  • Patent number: 6280631
    Abstract: The present invention provides a method for conditioning food processing waste prior to mechanical dewatering with the use of environmentally friendly coagulants and flocculants. The method of the present invention comprises treating these waste waters with an effective amount of a vinylamine polymer including from about 1 to about 100 mole percent vinylamine and from about 1 to about 99 mole percent of at least one monomer selected from the group consisting of amidine, vinylformamide, vinyl alcohol, vinyl acetate, vinyl pyrrolidinone and the esters, amides, nitriles and salts of acrylic acid and methacrytic acid. In an embodiment, the method of the present invention includes the further step of adding an effective amount of at least one flocculant to the food processing waste. The flocculent effectively agglomerates a portion of the colloidal organic solids into suspended solids.
    Type: Grant
    Filed: December 27, 1994
    Date of Patent: August 28, 2001
    Assignee: Nalco Chemical Company
    Inventors: Anthony G. Sommese, Daniel K. Chung
  • Patent number: 6270722
    Abstract: Stabilized bromine solutions are prepared by combining a bromine source and a stabilizer to form a mixture, adding an oxidizer to the mixture, and then adding, an alkaline source to adjust the pH of the mixture to at least 13.
    Type: Grant
    Filed: March 31, 1999
    Date of Patent: August 7, 2001
    Assignee: Nalco Chemical Company
    Inventors: Shunong Yang, William F. McCoy, Eric J. Allain, Eric R. Myers, Anthony W. Dallmier
  • Patent number: 6270627
    Abstract: The invention comprises a borosilicate retention aid composition and a method for improving the production of paper by addition of the borosilicate. The borosilicate may be utilized in conjunction with a high molecular weight synthetic flocculant and/or starch, with or without the addition of a cationic coagulant. The borosilicate material is preferably a colloidal borosilicate. Methods for the preparation of the borosilicate material are disclosed.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: August 7, 2001
    Assignee: Nalco Chemical Company
    Inventors: Bruce A. Keiser, James E. Whitten
  • Patent number: 6267897
    Abstract: Biofilm formation is inhibited in commercial and industrial water systems through the addition of at least one plant oil.
    Type: Grant
    Filed: May 4, 2000
    Date of Patent: July 31, 2001
    Assignee: Nalco Chemical Company
    Inventors: Linda R. Robertson, Victoria M. Kehoe, Laura E. Rice, Chandrashekar Shetty
  • Patent number: 6265477
    Abstract: An aqueous dispersion of a particulate high molecular weight water soluble anionic or nonionic polymer is prepared by polymerizing 0-7 mole percent of at least one anionic monomer and 100-93 mole percent of at least one non-ionic monomer under free radical forming conditions in an aqueous solution of a water-soluble salt at a pH greater than 5 in the presence of an anionic water soluble stabilizer polymer containing from about 1.25 to about 20 mole percent 2-acrylamido-2-methyl-l-propanesulfonic acid.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: July 24, 2001
    Assignee: Nalco Chemical Company
    Inventor: John R. Hurlock
  • Patent number: 6258277
    Abstract: The simultaneous precipitation of soluble heavy metal ions from semiconductor wastewater containing abrasive solids and enhancement of microfilter operation is achieved through the addition of an effective amount of a water-soluble polymer containing dithiocarbamate functionalities to the wastewater.
    Type: Grant
    Filed: August 14, 2000
    Date of Patent: July 10, 2001
    Assignee: Nalco Chemical Company
    Inventors: Kristine S. Salmen, Angela S. Kowalski, E. H. Kelle Zeiher, William J. Ward
  • Patent number: 6258279
    Abstract: This invention is directed to a method of removing color bodies from paper mill waste water comprising adding to the water an effective color-removing amount of a hydrophilic cationic dispersion polymer prepared by polymerizing i. a cationic diallyl-N,N-disubstituted ammonium monomer of formula (H2C═CHCH2)2N+R1R2X−  wherein R1 and R2 are independently C1-C20 alkyl, aryl, alkylaryl or arylalkyl and X is an anionic counterion and ii. an acrylamide monomer of formula  wherein R3 and R4 are independently hydrogen, C1-C10 alkyl, aryl or arylalkyl; R5 is hydrogen or methyl and R6 and R7 are independently hydrogen or C1-C10 alkyl, in an aqueous solution of a polyvalent anionic salt wherein the polymerization is carried out in the presence of a dispersant.
    Type: Grant
    Filed: August 23, 1999
    Date of Patent: July 10, 2001
    Assignee: Nalco Chemical Company
    Inventors: Jitendra Shah, Richard E. Metzgar
  • Patent number: 6255118
    Abstract: A solid-state fluorometry instrument is provided. The instrument is based on either diode laser or light-emitting diode (LED) excitation sources that are capable of being used in a wide range of applications. The solid-state diode laser based fluorometer instrument monitors fluorescent tracers, particularly suitable for industrial water sample stream applications. Using the instrument, a solid-state diode laser or light-emitting diode (LED) is used as an excitation source to excite fluorescent tracer molecules. The fluorescence resulting from the diode laser excitation is imaged with a lens onto a silicon photodiode detector. An optical filter is placed between the sample cell and the photodiode detector to reject scattered laser light. The output from the photodiode is amplified to produce an output voltage proportional to the quantity of fluorescence striking the photodiode detector.
    Type: Grant
    Filed: December 31, 1998
    Date of Patent: July 3, 2001
    Assignee: Nalco Chemical Company
    Inventors: Joseph C. Alfano, Michael J. Fehr, Martin R. Godfrey, John E. Hoots, Karen R. Tubergen, James E. Whitten, Narasimha M. Rao
  • Patent number: 6250140
    Abstract: A method measuring a rate of fouling caused by a heat flux through the surface subjected to electrochemical polarization. The method includes the steps of: providing a piezoelectric microbalance comprising a piezoelectric material with electrodes disposed thereon; exposing the working electrode of the microbalance to a flowing liquid, the liquid containing at least one fouling forming species; maintaining the liquid at a constant first temperature; maintaining the liquid at required hydrodynamic conditions; applying either a constant heat flux through the microbalance resulting in its working electrode having a variable second temperature or applying a variable heat flux through the microbalance resulting in its working electrode having a constant second temperature; and measuring a rate of fouling on the microbalance surface.
    Type: Grant
    Filed: June 22, 1999
    Date of Patent: June 26, 2001
    Assignee: Nalco Chemical Company
    Inventors: Dmitri Kouznetsov, Louis DiSanto, Donald Johnson, Paul R. Kraus, Barbara E. Moriarty
  • Patent number: 6248793
    Abstract: Methods for controlling wax and other contaminants by improving the dispersion of these materials through the addition of contaminant dispersants to the process of recycling paper and paperboard are disclosed. A preferred contaminant dispersant comprises: a) water; b) a plasticizer; c) an anionic dispersant; d) a surfactant wetting agent; and e) either 1) an acid or lecithin and optionally, a base, or 2) a preneutralized component.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: June 19, 2001
    Assignee: Nalco Chemical Company
    Inventors: Steven J. Severtson, Martin J. Coffey
  • Patent number: 6238487
    Abstract: A method for determining wafer cleanliness by fluorometric monitoring of the impurities in the semiconductor chip wafer rinse solution. A clean chip is indicated by a leveling off of increased concentration of impurities as the rinsing of the chip progresses. A method for optimizing reuse or recyling of the water discharged from the rinse process which accurately measures the contaminants in that water.
    Type: Grant
    Filed: June 16, 1999
    Date of Patent: May 29, 2001
    Assignee: Nalco Chemical Company
    Inventors: Brian V. Jenkins, John E. Hoots
  • Patent number: 6238521
    Abstract: A papermaking process consisting essentially of: forming an aqueous cellulosic papermaking slurry; adding to the slurry certain additives, with said certain additives selected from the group including: coagulants; sizing agents; and mineral fillers; draining the slurry to form a sheet; and drying the sheet to form a paper sheet; the improvement comprising adding to the slurry, prior to it being drained; an effective amount of a cationic dispersion polymer; which cationic dispersion polymer is a copolymer comprising about 30 mole % diallyldimethylammonium chloride (DADMAC) and about 70 mole % acrylamide (AcAm); and adding to the slurry, either before or after said cationic dispersion polymer is added and the slurry is drained, a microparticle selected from the group consisting of a) copolymers of acrylic acid and acrylamide; b) bentonite; and c) dispersed silica; with the proviso that said coagulant cannot be a cationic dispersion copolymer comprising about 30 mole % diallyldimethylammonium chloride
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: May 29, 2001
    Assignee: Nalco Chemical Company
    Inventors: Jane B. Wong Shing, Chidambaram Maltesh, Ramasubramanyam Nagarajan
  • Patent number: 6238486
    Abstract: The invention provides novel cationic flocculant dispersion polymers that can be utilized in the methods disclosed herein. This invention also provides methods for detecting cationic flocculants wherein said flocculants may be made via a dispersion process, a latex process or a dry polymer process. The flocculants are used to flocculate solids from liquid components of an industrial food process. The detection method involves the use of monoclonal antibodies to determine the presence or concentration of the cationic flocculants in the liquids.
    Type: Grant
    Filed: March 10, 1999
    Date of Patent: May 29, 2001
    Assignee: Nalco Chemical Company
    Inventors: Andrew J. Dunham, Cathy C. Johnson, Kristine S. Salmen, John W. Sparapany, Anthony G. Sommese
  • Patent number: 6235152
    Abstract: The present invention is directed to an improved process for inhibiting calcium carbonate scaling in aqueous systems such as that employed in the kraft process for the production of wood pulp. Such an improved process is achieved by the addition to the system of at least one antiscalant comprising at least one monomer unit derived from the group consisting of 1,2-dihydroxy-3-butene, N-(hydroxymethyl) acrylamide, and N-(sulfomethyl) acrylamide, and at least one monomer unit derived from the group consisting of maleic acid, acrylic acid, acrylamide, methacrylic acid, itaconic acid, vinyl sulfonic acid, styrene sulfonic acid, N-tertbutylacrylamide, butoxymethylacrylamide, N,N-dimethylacrylamide, sodium acrylamidomethyl propane sulfonic acid, and salts thereof, with with the proviso that said polymers do not contain the monomer unit —(CH2—CH═CH—CH2—O)—.
    Type: Grant
    Filed: November 9, 1999
    Date of Patent: May 22, 2001
    Assignee: Nalco Chemical Company
    Inventors: Prasad Yogendra Duggirala, John David Morris, Peter Edward Reed, Steven John Severtson
  • Patent number: 6232419
    Abstract: The present invention provides a novel class of polymer antiscalants which are polymers comprising a 1,2-dihydroxy-3-butene monomer unit and at least one monomer unit derived from the groups consisting of maleic acid, acrylic acid, acrylamide, methacrylic acid, itaconic acid, vinyl sulfonic acid, styrene sulfonic acid, N-tertbutylacrylamide, butoxymethylacrylamide, N,N-dimethylacrylamide, sodium acrylamidomethyl propane sulfonic acid, and salts thereof, with the proviso that said polymers do not contain the monomer unit —(CH2—CH═CH—CH2—O)—.
    Type: Grant
    Filed: November 9, 1999
    Date of Patent: May 15, 2001
    Assignee: Nalco Chemical Company
    Inventors: Prasad Yogendra Duggirala, John David Morris, Peter Edward Reed, Steven John Severtson
  • Patent number: 6231768
    Abstract: The present invention comprises a method for reducing the viscosity of the settled mud or underflow of a raked thickener thereby reducing the torque necessary to move the rake blade through the settled mud. The method includes the step of delivering a viscosity modifier to the settled mud and in front of the rake blade by pumping the viscosity modifier down the rake arm to an area in front of the rake blade. The method also includes an improved rake mechanism that includes a means for delivering viscosity modifier to the settled mud and in front of the rake blade. The present invention also includes a method for increasing the rate of consolidation of flocculated solids in a slurry.
    Type: Grant
    Filed: January 19, 1999
    Date of Patent: May 15, 2001
    Assignee: Nalco Chemical Company
    Inventors: Scott Lewis Barham, Raymond Leslie Henderson
  • Patent number: 6225430
    Abstract: The invention is a water-soluble N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine containing copolymer, wherein said copolymer is formed from the polymerization of an N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine of the formula:  wherein R is selected from the group consisting of alkyl and aryl groups, and R1 is selected from the group consisting of alkyl groups, aryl groups, and alkylaryl groups,  and an anionic monomer, and  the invention is also a method of inhibiting the precipitation and deposition of scale on metal surfaces in contact with industrial cooling waters comprising the addition of an effective, scale-inhibiting amount of a water-soluble N,N-diallyl-N-alkyl-N-(sulfoalkyl) ammonium betaine containing copolymer, wherein said copolymer is formed from the polymerization of a betaine of the formula:  wherein R is selected from the group consisting of alkyl and aryl groups, and R1 is selected from the group consisting of alkyl groups
    Type: Grant
    Filed: May 14, 1998
    Date of Patent: May 1, 2001
    Assignee: Nalco Chemical Company
    Inventors: Dodd W. Fong, Charles F. Marth, Ronald V. Davis