Patents Examined by Krisanne Shideler
  • Patent number: 5035807
    Abstract: The invention provides a chemical process for the treatment of water containing dissolved calcium and sulphate ions, so as to produce a purified product water having a reduced sulphate ion concentration. Barium sulphide is added to the water to cause precipitation of barium sulphate from the water. The water from which the barium sulphate has been precipitated is then treated with carbon dioxide to form hydrogen sulphide in the water, and the hydrogen sulphide is stripped from the water.
    Type: Grant
    Filed: March 14, 1990
    Date of Patent: July 30, 1991
    Assignee: CSIR
    Inventor: Johannes P. Maree
  • Patent number: 5032291
    Abstract: A process is disclosed for treating water or solids contaminated with a nitro- or nitroso- substituted compound comprising reducing a nitro- or nitroso- substituted compound in the presence of an effective catalytic amount of at least one of a corrin- or porphyrin- metal complex. The present invention is particularly useful in treating waste water or soil contaminated with nitro- or nitroso- substituted compounds.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: July 16, 1991
    Assignee: ABB Environmental Services Inc.
    Inventor: Kerry L. Sublette
  • Patent number: 5028338
    Abstract: A process is disclosed for immobilizing environmentally noxious organic, particularly aromatic, substances by absorbing them on a layered clay mineral modified by exchange with a quaternary ammonium compound, thereby increasing the spacing between the layers and rendering the adsorption surfaces hydrophobic.After adsorption of the organic compounds the spacing between the layers of the layered clay mineral is reduced by a layer spacing reducing agent, and subsequently the clay mineral containing the organic compounds is mixed with a hardenable inorganic binder and the whole is hardened.A typical example of a modifying agent is a quanternary ammonium compound, and of a layer spacing reducing agent an alkaline substance, such as sodium hydroxide.Typical clay minerals are chosen among the smectite minerals, tectosilicates and phyllosilicates; preferably montmorillonite clay is used.The inorganic binder may be a calcium hydroxide compound or a calcium containing cement, preferably containing fly ash.
    Type: Grant
    Filed: May 10, 1990
    Date of Patent: July 2, 1991
    Assignee: Pelt & Hooykaas
    Inventor: Carel W. J. Hooykaas
  • Patent number: 5026485
    Abstract: A method is disclosed for treating wastewater from a suspension styrene-acrylonitrile (SAN) copolymerization process. The wastewater contains SAN and polyvinyl alocohol (PVA) as a suspensing agent. The method includes the steps of adding to the wastewater a floc forming effective amount of a) a water soluble borate salt, preferably sodium metaborate and b) a water soluble ferrous salt, preferably ferrous sulfate, and separating the resulting floc which contains the SAN particles and PVA from the treated wastewater.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: June 25, 1991
    Assignee: General Electric Company
    Inventor: Oscar E. Anderson
  • Patent number: 5022983
    Abstract: A flotation process is disclosed for cleaning of particulate coal and separation therefrom of pyrite and ash. A flotation pulp is prepared comprising a particulate coal feed material and an anionic surfactant selected from among alkanesulfonic acids, alkenesulfonic acids, alkynesulfonic acids, arenesulfonic acids, alkyl sulfuric acids, alkenyl sulfuric acids, alkynyl sulfuric acids, aryl sulfuric acids and salts of these acids. Among the particularly preferred surfactants are substituted ethenesulfonic acids and salts thereof. Other preferred embodiments include the use of at least about 0.3 pound surfactant per ton of particulate feed material; implementation of the process via aggregate flotation, in which at least about 50% by weight of the particulate coal feed material is smaller than about 400 mesh; and use of combinations of anionic surfactants and nonionic frothing agents. A novel composition of matter comprising the anionic surfactants adn a nonionic compound is also disclosed.
    Type: Grant
    Filed: August 17, 1989
    Date of Patent: June 11, 1991
    Assignee: Southern Illinois University Foundation
    Inventors: Cal Y. Myers, Richard B. Read
  • Patent number: 5021167
    Abstract: A method is disclosed for clarifying water comprising dosing the water to be clarified with a copolymer produced by the emulsion polymerization of only hydrophobic monomers where at least one hydrophobic monomer is an amine containing monomer which is hydrophobic when the amine is neutral and hydrophilic when the amine is salified.
    Type: Grant
    Filed: July 10, 1989
    Date of Patent: June 4, 1991
    Assignee: Nalco Chemical Company
    Inventors: Michael L. Braden, Stephan J. Allenson
  • Patent number: 5015458
    Abstract: A method is disclosed for removing iron from iron-contaminated sulfuric acid to render the sulfuric acid suitable for ion membrane processing which comprises contacting the iron-contaminated sulfuric acid with an oxidizing agent to oxidize essentially all of the iron to the +3 oxidation state, contacting the resulting iron-contaminated sulfuric acid containing oxidized iron with a complexing agent which can be citric acid, oxalic acid, and tartaric acid, with the amount of the complexing agent being sufficient to complex essentially all of the oxidized iron, and contacting the resulting iron-contaminated sulfuric acid containing the complexed iron with activated carbon to remove essentially all of the iron and produce a purified sulfuric acid solution.
    Type: Grant
    Filed: April 4, 1990
    Date of Patent: May 14, 1991
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Timothy J. Hoffman
  • Patent number: 5013452
    Abstract: A method for resolving emulsions produced in preparation of pharmaceuticals by fermentation and in other such bioprocesses is disclosed. The method comprises adding an effective amount of a demulsifier to an emulsion containing fermentation product that includes a pharmaceutical which is desired to be extracted from the emulsion.
    Type: Grant
    Filed: December 4, 1989
    Date of Patent: May 7, 1991
    Assignee: Petrolite Corporation
    Inventors: Thomas J. Bellos, Richard D. Keating
  • Patent number: 5013456
    Abstract: Co-polymers of diallyldimethyl ammonium chloride with up to 30 mole percent of a water soluble anionic monomer such as acrylic acid are superior coagulants for deinking process waters.
    Type: Grant
    Filed: April 13, 1990
    Date of Patent: May 7, 1991
    Assignee: Nalco Chemical Company
    Inventors: Michael R. St. John, Ronnie L. Alexander
  • Patent number: 5013454
    Abstract: A method of removing dissolved and colloidal macro-molecular organic substances from effluents from processes used in the manufacture of pulp and paper, wherein an acid sludge containing cellulose fibres and being acidified to a pH value of 1.6-2.5, is added to an effluent containing said organic substances, and the pH value is adjusted to 4.5-6.0 before the mixture is subjected to sedimentation to achieve precipitation of the fibres with said organic substances adhered thereto. According to the invention the fibres used as precipitant are subjected to mechanical treatment prior to said acidification, so that the fibres are broken and split open, increasing their specific fibre surface and thereby their ability to catch the organic substances in the effluent.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: May 7, 1991
    Assignee: A. Ahlstrom Corporation
    Inventor: Pertti Hynninen
  • Patent number: 5013443
    Abstract: Extraction and separation method and apparatus using a supercritical fluid for extracting a specified component from a sample by a supercritical fluid and introducing the supercritical fluid containing the extracted component into a silica gel column coated with silver nitrate so as to separate the extracted component.By the combination of the extracting operation by a supercritical fluid under mild conditions and chromatography taking the advantage of the selectivity of the silica gel column coated with silver nitrate to olefins, the extract is obtained at a high concentration without producing denaturation.
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: May 7, 1991
    Assignee: Nihon Bunko Kogyo Kabushiki Kaisha
    Inventors: Sakae Higashidate, Yoshio Yamauchi, Muneo Saito
  • Patent number: 5011612
    Abstract: This invention relates to a method of improving the dewatering of alumina trihydrate obtained by the Bayer process. The method comprises treating the alumina trihydrate with the product of mixing an alkaline liquor and a C.sub.8 to C.sub.20 fatty acid, fatty acid precursor such as an ester or amide, or a fatty acid blend. The product, a fatty acid salt, is an effective dewatering aid.The alumina trihydrate may be washed with a liquor including said product, or the product may be added to a Bayer liquor slurry prior to filtration of the alumina trihydrate.The invention also contemplates a watering aid consisting of the product of mixing an alkaline liquor with a C.sub.8 to C.sub.20 fatty acid or fatty acid precursor.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: April 30, 1991
    Assignees: Industrial Minerals Research & Development Pty. Ltd., Nabalco Pty. Ltd.
    Inventor: Mark Keeney
  • Patent number: 5011613
    Abstract: A method for regulating the residual free chlorine in drinking water, characterized in that the regulation is carried out by introduction of a quantity of chlorine determined as a function of the chlorine demand at "the head" of the line, that is upstream of the water treatment or storage line, while obtaining in the distribution network, water having an acceptable residual free chlorine content. The chlorine demand of the water at the inlet of the treatment, or storage line is rapidly determined by accelerating, the reactions tied to disinfection by heating so as to obtain over a short period (from 5 to 10 minutes) water having a residual free chlorine content corresponding to the required value.
    Type: Grant
    Filed: January 18, 1990
    Date of Patent: April 30, 1991
    Assignee: Lyonnaise des Eaux
    Inventors: Cathy Feray, Conrad Hubele
  • Patent number: 5009793
    Abstract: A process for the heavy-metal decontamination of contaminated substances such as natural and industrial sludges, thermal residues and soils. The contaminated starting substance is treated with an acid and the dissolved metal salts are precipitated as metal hydroxides in the pH range of about 3.5-11. The exact control of the pH value makes it possible to isolate individual metal fractions which can be used as raw materials in the metallurgical industry.
    Type: Grant
    Filed: January 9, 1990
    Date of Patent: April 23, 1991
    Assignee: Industrie Automation Sondertechnik GmbH & Co.
    Inventor: German Muller
  • Patent number: 5008018
    Abstract: The invention relates to a process for the reduction in size of the pores of a filter medium for beverages, preferably beer. Silica sol is added to the beverage to be filtered. In order to be able to reduce the size of the pores of the filter medium in a simple manner and to adjust it to the requirements, upstream of the filter medium through which passes the beverage, silica sol is added continuously or in a batch-feed process using a tank, in such a quantity and controlled such that the silicic-acid precipitation, i.e. the transition from SiO.sub.2 primary particles to SiO.sub.2 secondary particles, has taken place before the beverage has left the filter medium. The resultant silicic-acid precipitation reduces the size of the pores without sealing them.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: April 16, 1991
    Assignee: Stabifix Brauerei-Technik GmbH & Co. OHG
    Inventor: Karl Raible
  • Patent number: 5008019
    Abstract: Water supply contamination is reduced within a formation or eliminated in a flooding procedure utilizing an alkaline aqueous solution. Biodegradable polymer provides a desired viscosity and mobility. Biodegradable surfactant and alkali provide any needed interfacial tension reduction. Additives, e.g., chelating agents, can be utilized for solubilization of insoluble contaminants.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: April 16, 1991
    Assignee: Waste-Tech Services, Inc.
    Inventor: Paul B. Trost
  • Patent number: 5008015
    Abstract: The content of hydrogen chloride and phosphorous acid of crude amino organic phosphonic acids, especially diethylenetriaminepentakis (methylene phosphonic acid) is reduced by solvent extraction into an alcoholic phase leaving purified phosphonic acid behind.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: April 16, 1991
    Assignee: Albright & Wilson Limited
    Inventors: Paul M. Davies, Raymond A. Smith
  • Patent number: 5006639
    Abstract: The present invention provides a method of coagulating sludge, which comprises adding sequentially an anionic polymer coagulant and a cationic polymer coagulant to sludge, and furthermore, adding an anionic polymer coagulant.According to the present invention, it is possible to coagulate sludge at a far higher efficiency with a far smaller dewatering load than in the typical conventional methods using an inorganic salt and a pH adjusting reagent.
    Type: Grant
    Filed: January 11, 1989
    Date of Patent: April 9, 1991
    Assignee: Aoki Corporation
    Inventors: Show Tono, Toshiyuki Miki, Yoshihide Dairokuno, Jyun Kataoka
  • Patent number: 5004547
    Abstract: Bioaffinity separation is carried out in a cascade of column segments under control of a computer which selectively connects each column segment to a collector so that the individual bioactive components which are selectively retained by a biospecific sorbent can be individually collected. The volume and flow rate of eluate collected following each segment serve as the measure for the addition of makeup eluant between that column segment of the cascade and the next column segment.
    Type: Grant
    Filed: July 5, 1989
    Date of Patent: April 2, 1991
    Assignee: Technion Research & Development Foundation Ltd.
    Inventors: Hay Grunfeld, Noah Lotan, Samuel Sideman
  • Patent number: 5004551
    Abstract: A process for treating water or solids contaminated with at least one chlorinated phenol which comprises oxidizing the at least one chlorinated phenol in the presence of an effective catalytic amount of a corrin- or porphyrin-metal complex. A preferred catalyst is a complex of Fe.sup.3+ ion with protoporphyrin known as hematin. Chlorinated phenols which may be oxidized include those found in hazardous wastes such as chlorophenols, dichlorophenols, trichlorophenols, tetrachlorinated phenols, and pentachlorinated phenols.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: April 2, 1991
    Assignee: ABB Environmental Services Inc.
    Inventor: Kerry L. Sublette