Patents Assigned to Transvalor
  • Complex composition resulting from the action of urea on a sulfuric sludge of petroleum origin, process for the preparation thereof and use thereof as a source of fertilizing material
    Patent number: 5470370
    Abstract: A complex composition formed by the product resulting from the action of urea on a sludge of petroleum origin containing by weight from 50 to 99% of sulfuric acid and from 1 to 20% of organic residues. The acid sludge may contain water and often comes from an alkylation reaction. This composition can be used as a source of fertilizing material or as a component of a fertilizing formulation.
    Type: Grant
    Filed: June 29, 1994
    Date of Patent: November 28, 1995
    Assignees: Institut Francais du Petrole, Transvalor
    Inventors: Daniel Lonchamp, Yvan Schwob
  • Process for the production of phospho-nitrogenous products and products thus obtained
    Patent number: 5409516
    Abstract: The method relates to the production of phospho-nitrogenous products soluble in neutral ammonium citrate and wherein free urea does not remain in significant amount in such products. Most of the free urea is involved in a ureic combination of calcium sulphate. Tricalcic phosphate is reacted with a reactant obtained by mixing sulfuric acid and urea. The process is particularly useful for the manufacture of fertilizers.
    Type: Grant
    Filed: September 15, 1993
    Date of Patent: April 25, 1995
    Assignees: Transvalor, Grande Paroisse S.A.
    Inventors: Patrick Achard, Pierre Ilbizian, Laurent Limousin, Bernard Neveu, Jean-Bernard Peudpiece, Yvan A. Schwob