Patents Assigned to Rhone-Poulence Chimie
  • Preparation of p-aminophenols
    Patent number: 5288906
    Abstract: Optionally substituted p-aminophenol compounds, easily converted into the N-acylated derivatives thereof, are prepared by hydrogenating the corresponding nitrobenzene, in solution in a saturated aliphatic monocarboxylic acid, notably acetic acid, in the presence of an effective amount of a protonic acid.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: February 22, 1994
    Assignee: Rhone-Poulence Chimie
    Inventors: Michel Gubelmann, Christian Maliverney
  • Separation of rare earth values by liquid/liquid extraction
    Patent number: 5188735
    Abstract: The rare earth values contained in an aqueous solution of the nitrates of at least two rare earth elements are conveniently separated by first liquid/liquid extracting such aqueous nitrate solution with a liquid organic phase containing a P(O)R.sub.1 R.sub.2 R.sub.3 organophosphorus extractant.
    Type: Grant
    Filed: February 21, 1991
    Date of Patent: February 23, 1993
    Assignee: Rhone-Poulence Chimie
    Inventors: Thierry Delloye, Jean-Louis Sabot