Patents Assigned to Interox
  • Patent number: 5681807
    Abstract: The use of lactobionic acid, lactobionic acid salts and/or lactobionic acid derivatives as covering material is disclosed for coating alkali metal peroxy salts, in particular for coating sodium percarbonate. In an advantageous alternative of the invention, alkali metal peroxy salts are provided with a covering layer that contains as covering materials lactobionic acid and/or lactobionic acid salt mixed with boric acid and/or a boric acid salt as additional covering material. This coating stabilizes the alkali metal peroxy salts and protects them against humidity and decomposition. In another advantageous alternative, lactobionic acid, lactobionic acid salts and/or lactobionic acid derivatives are used in combination with or in particular mixed with an inorganic mineral salt mixture of alkali metal sulphate and alkali metal chloride as additional covering material for coating alkali metal peroxy salts, in particular for coating sodium percarbonate.
    Type: Grant
    Filed: October 1, 1996
    Date of Patent: October 28, 1997
    Assignee: Solvay Interox GmbH
    Inventors: Helmut Honig, Werner Doetsch, Manfred Mathes, Klaus-Guenter Gerling, Gerd Hecken
  • Patent number: 5675042
    Abstract: Phenols, and related aromatic compounds, phenolic ethers, can be hydroxylated selectively using hydrogen peroxide in the presence of an amorphous or crystalline tin or cerium phosphate catalyst in a solvent containing an aliphatic carboxylic acid. The process is particularly suitable for phenol itself, and advantageously employs a catalyst obtained by heating an hydrated amorphous or crystalline tin or cerium phosphate for example at about 100.degree. C. A convenient hydroxylation temperature is in the range of 50.degree. to 90.degree. C., and a convenient solvent is acetic acid.
    Type: Grant
    Filed: August 3, 1995
    Date of Patent: October 7, 1997
    Assignee: Solvay Interox Limited
    Inventor: Robert Alexander Walker Johnstone
  • Patent number: 5670470
    Abstract: A process for stabilising percarbonate by coating with a coating agent. The percarbonate particles are treated with a concentrated aqueous solution containing at least one boron compound selected from the metal and ortho boric acids and at least one phosphate. Water is removed to provide the coated percarbonate particles which are useful in bleaching and washing compositions.
    Type: Grant
    Filed: June 21, 1995
    Date of Patent: September 23, 1997
    Assignee: Solvay Interox Limited
    Inventors: Graham Robert Horne, Alun Pryce James
  • Patent number: 5665891
    Abstract: A process for the catalysed oxidation of ketones to esters or lactones with hydrogen peroxide in the presence of a carboxylic acid or anhydride is provided. The process employs gamma alumina as a heterogeneous catalyst. In certain preferred embodiments the catalyst also contains a tungsten-containing heteropolyacid. Preferably, the heteropolyacid contains phosphorus. In a related process, the catalyst accelerates the formation of percarboxylic acid solutions.
    Type: Grant
    Filed: October 12, 1995
    Date of Patent: September 9, 1997
    Assignee: Solvay Interox Limited
    Inventors: Scott William Brown, Alexander Johnstone, William Ronald Sanderson
  • Patent number: 5665427
    Abstract: The invention relates to a process for stabilizing particulate alkali metal percarbonate by coating by coating it with an aqueous solution, preferably concentrated, of a complex formed from a boric acid or borate and an organic diol, polyol or hydroxycarboxylic acid, to the resulting coated product, and to compositions including the product. The coating can additionally contain an alkali metal neutral salt such as sodium chloride or sodium sulphate.
    Type: Grant
    Filed: May 30, 1996
    Date of Patent: September 9, 1997
    Assignee: Solvay Interox Limited
    Inventors: Graham Robert Horne, Alun Pryce James
  • Patent number: 5645686
    Abstract: Process for bleaching a chemical paper pulp by means of a sequence of treatment stages involving at least one stage with an enzyme and at least one stage with a peroxyacid.
    Type: Grant
    Filed: October 13, 1994
    Date of Patent: July 8, 1997
    Assignee: Solvay Interox (Societe Anonyme)
    Inventors: Nicholas A. Troughton, Fran.cedilla.ois Desprez, Johan Devenyns, Pierre Ledoux, Rene Detroz
  • Patent number: 5624634
    Abstract: A multi-component product for providing, on mixing of the components, a disinfectant composition. A first component of the product comprises an aqueous solution of a lower aliphatic peracid and a second component comprises an aqueous solution containing a phosphate corrosion inhibitor and either a hydrogen peroxide stabilizer, a peracid stabilizer, or both.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: April 29, 1997
    Assignee: Solvay Interox Limited
    Inventors: Paul Brougham, Robert A. Simms
  • Patent number: 5621118
    Abstract: A process for oxidizing a substrate susceptible to nucleophilic oxidation by reacting a bicaroate or monopersulfate solution with the substrate is disclosed. In one aspect, the substrate is introduced into the reaction mixture in an inert carrier gas, which can also serve to sweep the product out of the mixture. In a second aspect the oxidation solution is obtained by a two stage neutralization of a Caro's acid solution, the first stage to e.g. 0.5 to 2.0 and the second stage to about 7 to 9. In preferred embodiments, the substrate is introduced into partially neutralized Caro's acid, and the second stage neutralization in the presence of the substrate is most preferably carried out with an alkali salt such as sodium bicarbonate. The process can employ relatively low ratios of substrate: Caro's acid oxidant and homogeneous reaction conditions. The process is particularly useful for preparing dioxiranes from ketones.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: April 15, 1997
    Assignee: Solvay Interox Limited
    Inventors: Craig W. Jones, William R. Sanderson, John P. Sankey
  • Patent number: 5621097
    Abstract: A process for the oxidation of organosulphur compounds with hydrogen peroxide is provided. The process employs solid supported polyacids comprising tungsten, molybdenum and/or vanadium as catalysts. The supports are selected from compounds, preferably oxides, of Group IIa, IIb, IIIb, IVa and IVb elements, and strong base ion exchange resins. Certain embodiments of the process provide for the oxidation of sulphides to sulphoxides or sulphones, particularly for the oxidation of penicillins to penicillin sulphoxides. Other embodiments of the process provide for the selective oxidation of thiols to sulphoxides.
    Type: Grant
    Filed: November 3, 1995
    Date of Patent: April 15, 1997
    Assignee: Solvay Interox Limited
    Inventors: Scott W. Brown, Angela M. Lee, Stephen C. Oakes
  • Patent number: 5565231
    Abstract: Solutions of sugars obtained during the processing of foodstuffs can be subject to bacterial contamination. In view of the possible legislation to prevent the use of existing disinfectants such as formaldehyde in these conditions, alternative treatments are needed. Effective disinfection of sugar solutions can be achieved employing a peracetic acid solution containing a high mole ratio of hydrogen peroxide to peracetic acid, such as from 18:1 to about 54:1 in combination with a second peracetic acid solution.
    Type: Grant
    Filed: August 15, 1995
    Date of Patent: October 15, 1996
    Assignees: Solvay Interox Limited, British Sugar PLC
    Inventors: Joseph W. G. Malone, Robert A. Simms, Garry I. Bowler
  • Patent number: 5556834
    Abstract: A process for stabilizing percarbonate by coating by means of a coating agent according to which the percarbonate particles are treated with a concentrated aqueous solution containing at least one boron compound selected from meta and ortho boric acids and at least one silicate, following by removal of water to provide coated percarbonate particles. The solution is prepared by adding the boron compound to a solution of the silicate. The coated particles are useful in washing and bleaching compositions.
    Type: Grant
    Filed: June 21, 1995
    Date of Patent: September 17, 1996
    Assignee: Solvay Interox Limited
    Inventors: Alun P. James, Graham R. Horne
  • Patent number: 5557008
    Abstract: A one pot process for the perfluoroalkylation and/or perfluoroacyloxylation of organic substrates is provided. The process comprises contacting a substrate with a perfluoroalkanoic anhydride in the presence of an inorganic peroxygen compound at a temperature of greater than 10.degree. C. Substrates that can be perfluoroalkylated and/or perfluoroacyloxylated include alkylbenzenes, halogenated aromatic compounds, alkoxybenzenes, aryl benzenes, and aromatic and aliphatic disulphides. Preferably, the perfluoroalkanoic anhydride is trifluoroacetic anhydride and the inorganic peroxygen compound is sodium percarbonate.
    Type: Grant
    Filed: September 6, 1995
    Date of Patent: September 17, 1996
    Assignee: Solvay Interox Limited
    Inventors: Craig W. Jones, William R. Sanderson, John P. Sankey
  • Patent number: 5552018
    Abstract: Process for improving the selectivity of the delignification of a chemical paper pulp by employing a peroxyacid, in which the unbleached pulp originating from the cooking operation is treated with an aqueous solution of this organic peroxyacid in the presence of at least one stabilizer selected from phosphonic acids and their salts.
    Type: Grant
    Filed: June 29, 1993
    Date of Patent: September 3, 1996
    Assignee: Solvay Interox (Societe Anonyme)
    Inventor: Johan Devenyns
  • Patent number: 5545343
    Abstract: A multi-component product for providing, on mixing of the components, a disinfectant composition. A first component of the product comprises an aqueous solution of a lower aliphatic peracid and a second component comprises an aqueous solution containing a corrosion inhibitor and either a hydrogen peroxide stabilizer, a peracid stabilizer, or both.
    Type: Grant
    Filed: June 21, 1994
    Date of Patent: August 13, 1996
    Assignee: Solvay Interox Limited
    Inventors: Paul Brougham, Robert A. Simms
  • Patent number: 5545391
    Abstract: Hydrogen sulphide can be removed from a gaseous stream by contact with a 2,3-dialkyl substituted naphthoquinone in the presence of a catalytic amount of an amine catalyst dissolved in a hydrophobic organic solvent system, with consequential formation of a corresponding quinhydrone and insoluble elemental sulphur. Preferably the total number of carbons in the alkyl substituents is from 2 to 6. Particularly suitable compounds comprise dimethyl and/or ethyl/methyl naphthoquinones. Preferably the amine catalyst has a pK in the range of about 9 to 11.5. Preferred solvent systems comprise mixtures of aromatic hydrocarbons with aliphatic esters such as methyl cyclohexanol acetate or dialkylketones such as diisobutylcarbinol. Advantageously, the naphthoquinone react with hydrogen sulphide significantly faster than do the anthraquinone or tetrahydroanthraquinone compounds hitherto proposed.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: August 13, 1996
    Assignee: Solvay Interox Limited
    Inventors: Phillip A. Clapp, Dennis F. Evans, deceased, Antonia F. E. McKenna, executrix
  • Patent number: 5545374
    Abstract: Microbicidal compositions having activity over a broad pH range are provided. The compositions include a peracid and a nonionic surfactant according to the general chemical formula: R-(OCH.sub.2 CH.sub.2).sub.n -(OCH.sub.2 CH.sub.2 CH.sub.3).sub.p -OH, wherein R represents an alkyl group of at least 6 carbon atoms, and n and p each represent an integer. The compositions can additionally include a cationic surfactant.
    Type: Grant
    Filed: June 21, 1995
    Date of Patent: August 13, 1996
    Assignee: Solvay Interox Limited
    Inventors: Madeline S. French, Anita J. Harvey
  • Patent number: 5538152
    Abstract: Stabilizing composition for inorganic peroxides and hydrogen peroxide intended for baths for the surface treatment of metal components comprising at least one activating agent selected from derivatives of benzotriazoles of imidazole and of carboxyimidazoles. Process for the treatment of metal surfaces using the composition at acid pH in the presence of inorganic peroxide. Use of the composition for producing a bath for pickling, polishing or burnishing metals.
    Type: Grant
    Filed: June 22, 1994
    Date of Patent: July 23, 1996
    Assignee: Solvay Interox S.p.A.
    Inventor: Costante Fontana
  • Patent number: 5538636
    Abstract: A process to purify waste waters using chemical oxidation and Fenton's reagent by the action in the acid range of hydrogen peroxide and iron(II) compounds and subsequent precipitation in the weakly acid to alkaline range of the iron(III) compounds, said process being characterized in that the sludge containing iron(III) accumulating in addition to the purified waste water is reduced electrolytically back into iron(II) compounds and in that the sludge so reduced is fed back into the process. The process of the invention allows extensive purification of highly concentrated waste waters and furthermore problems arising with the treatment and elimination of the Fenton sludge can be circumvented.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: July 23, 1996
    Assignee: Solvay Interox GmbH
    Inventors: Michael Gnann, Carl-Heinz Gregor, Siegfried Schelle
  • Patent number: 5534115
    Abstract: Process for preserving the mechanical strength properties of a chemical paper pulp, comprising two treatment stages by means of a peroxidic reagent, with the first stage in an acidic medium and the second stage in an alkaline medium, according to which a treatment by means of a reducing compound is interposed between the two stages.
    Type: Grant
    Filed: April 15, 1993
    Date of Patent: July 9, 1996
    Assignee: Interox International (Societe anonyme)
    Inventors: Marc Hoyos, Marcel Robberechts, Paul Essemaeker
  • Patent number: 5527956
    Abstract: Fluro-substituted aromatic carboxylic acids, and particular 2- and 4-fluorobenzoic acid can be made from the corresponding fluoro-methyl compound such as fluorotoluene in a single stage by the reaction at elevated temperature, preferably of at least 80.degree. C. with hydrogen peroxide and bromide in mole ratios to the substrate of greater than 2:1, and preferably around 3:1, in the presence of means capable of generating bromine free radicals from bromine molecules, such as radiation having a wavelength of not greater than 600 nm or an organic peroxide.
    Type: Grant
    Filed: December 15, 1994
    Date of Patent: June 18, 1996
    Assignee: Solvay Interox Limited
    Inventor: Richard G. Jones