Patents Assigned to Institut Francais du Petrole des Carburants et Lubricants et Enterprise de Recherches et d'Activities Petroliers Elf
  • Process for reducing molten ammonium sulfates containing metallic impurities to ammonia and sulfur dioxide
    Patent number: 4029745
    Abstract: Molten ammonium sulfates containing iron sulfate as an impurity may be reduced with sulfur or a sulfur compound over long periods provided a fraction of these impure ammonium sulfates is withdrawn, treated for iron removal and fed back to the reduction zone.
    Type: Grant
    Filed: July 21, 1975
    Date of Patent: June 14, 1977
    Assignee: Institut Francais du Petrole des Carburants et Lubricants et Enterprise de Recherches et d'Activities Petroliers Elf
    Inventors: Claude Dezael, Philippe Renault, Andre Deschamps