Elemental Sulfur Patents (Class 423/567.1)
  • Patent number: 6652660
    Abstract: A method for treating compounds which contain reactive sulfur is disclosed, wherein the treatment produces compounds which contain sulfur in a non reactive form. The method is based on the use of an oxidizing compound selected from the group consisting of water soluble inorganic persulfates, water soluble inorganic and organic adducts of hydrogen peroxide and mixtures thereof. The method is particularly useful in preventing stress corrosion cracking of stainless steel and in preventing auto-ignition of pyrophoric iron sulfide.
    Type: Grant
    Filed: January 23, 2003
    Date of Patent: November 25, 2003
    Assignee: United Laboratories Intl., LLC
    Inventor: Jack G. Frost
  • Patent number: 6627680
    Abstract: The present invention are methods for and products having an elemental sulfur matrix. The matrix is formed by using an amount of shear force on molten elemental sulfur, where the molten sulfur is combined with a matrix forming material.
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: September 30, 2003
    Inventor: Bohdan Zakiewicz
  • Publication number: 20030118470
    Abstract: A method for treating compounds which contain reactive sulfur is disclosed, wherein the treatment produces compounds which contain sulfur in a non reactive form. The method is based on the use of an oxidizing compound selected from the group consisting of water soluble inorganic persulfates, water soluble inorganic and organic adducts of hydrogen peroxide and mixtures thereof. The method is particularly useful in preventing stress corrosion cracking of stainless steel and in preventing auto-ignition of pyrophoric iron sulfide.
    Type: Application
    Filed: January 23, 2003
    Publication date: June 26, 2003
    Inventor: Jack G. Frost
  • Publication number: 20030082086
    Abstract: A process for removing thiothionylfluoride from a composition containing sulfur tetrafluoride and thiothionylfluoride includes contacting the composition with a high surface area material, such as activated carbon. The process can provide purified sulfur tetrafluoride free of thiothionylfluoride. The high surface area material can be replaced for further processing. Alternatively, the material can be regenerated by contacting it with a gas mixture of oxygen and nitrogen at 150-450° C. and converting the adsorbed elemental sulfur to sulfur dioxide without oxidation of the material.
    Type: Application
    Filed: November 1, 2001
    Publication date: May 1, 2003
    Inventor: Philip Bruce Henderson
  • Patent number: 6555087
    Abstract: A procedure for the production of polymeric sulfur with improved stability that comprises the stages of: (a) cooling in a vessel for rapid cooling the sulfur vapor from the vaporization of molten sulfur, by bringing it into direct contact with a refrigerating suspension composed of carbon disulphide, soluble sulfur and polymeric sulfur, to a temperature such that part of the sulfur vapor is transformed into a powder-like polymeric sulfur, insoluble in carbon disulphide. (b) extracting the resulting suspension from the cooling vessel; (c) recycling part of said suspension to the vessel for cooling; and (d) sending the rest of the suspension to a maturation stage to stabilize the polymeric sulfur.
    Type: Grant
    Filed: February 5, 2001
    Date of Patent: April 29, 2003
    Assignee: Repsol Petroleo, S.A.
    Inventors: Juan Castro Pascual, Fernando Temprano Posada, Jose Carlos Rojo Gonzalez
  • Patent number: 6547959
    Abstract: A method for treating compounds which contain reactive sulfur is disclosed, wherein the treatment produces compounds which contain sulfur in a non reactive form. The method is based on the use of an oxidizing compound selected from the group consisting of water soluble inorganic persulfates, water soluble inorganic and organic adducts of hydrogen peroxide and mixtures thereof. The method is particularly useful in preventing stress corrosion cracking of stainless steel and in preventing auto-ignition of pyrophoric iron sulfide.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: April 15, 2003
    Assignee: United Laboratories International, LLC
    Inventor: Jack G. Frost
  • Patent number: 6521020
    Abstract: A process for adsorbing hydrocarbons from an acid gas stream includes passing the acid gas stream through an adsorbent which selectively removes hydrocarbons, desorbing the hydrocarbons from the adsorbent and contacting the desorbed hydrocarbons with an acid gas removal solution to remove acid gases which have been coadsorbed with the hydrocarbons. The process is particularly useful in removing hydrocarbons from a hydrogen sulfide-containing stream which is being directed to Claus processing for conversion into elemental sulfur. Useful adsorbents include crystalline titanium silicate molecular sieves containing titania octahedral sites such as ETS-10 and similar materials, as well as high silica aluminosilicate zeolite.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: February 18, 2003
    Assignee: Engelhard Corporation
    Inventors: Kenneth F. Butwell, William B. Dolan, Steven M. Kuznicki
  • Patent number: 6521201
    Abstract: High quality hydrophilic sulfur is recovered from a biologial conversion zone in which a sulfur containing compound such as a sulfide is converted to elemental sulfur. The sulfur is rendered hydrophilic due to the fine particle size and attachment of biomass to the particles. The sulfur is recovered as an undamaged agglomerate powder after being processed in at least two stages of purification.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: February 18, 2003
    Assignee: UOP LLC
    Inventor: Mohammed Munaf Seriwala
  • Publication number: 20020061270
    Abstract: Remediation of gases is accomplished by intimately mixing the products of combustion with a minute quantity of ozone to convert pollutants to highly soluble compounds. The resulting gas mixture is then reduced in temperature and the problematic gas constituents are placed into solution. This is accomplished through the use of one or more water spray towers, placed in series with the gas flow. The clean gas is released. The contaminated water is remediated by water treatment methods and apparatuses, such as those employing the CBR Patents.
    Type: Application
    Filed: May 30, 2001
    Publication date: May 23, 2002
    Inventor: Gerard W. Osborne
  • Publication number: 20010022958
    Abstract: A procedure for the production of polymeric sulfur with improved stability that comprises the stages of:
    Type: Application
    Filed: February 5, 2001
    Publication date: September 20, 2001
    Applicant: Repsol Petroleo, S.A.
    Inventors: Juan Castro Pascual, Fernando Temprano Posada, Jose Carlos Rojo Gonzalez
  • Patent number: 6180079
    Abstract: In wet oxidizing process of an aqueous alkali waste which contains absorbed hydrogen sulfide and carbon dioxide, a convenient method for improving the safety in oxidizing operation and the efficiency in oxidation reaction.
    Type: Grant
    Filed: January 28, 1997
    Date of Patent: January 30, 2001
    Assignee: Nippon Petrochemicals Company, Limited
    Inventor: Isoo Shimizu