Patents Assigned to Ruhrkohle Oel und Gas GmbH
  • Process for cleaning debris containing pollutants
    Patent number: 5296040
    Abstract: Process for the cleaning of debris containing water and contaminated with pollutants using solvents, including the steps of: addition of the solvent to the material to be treated, followed by thorough mixing; separation of the liquid phase containing the pollutants; stripping of the remaining solvent from the residue; and recovery of the solvent obtained in the last two steps.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: March 22, 1994
    Assignee: Ruhrkohle Oel und Gas GmbH
    Inventors: Herbert Dybus, Otto Funk