Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1993-11-05
1996-04-16
Drodge, Joseph W.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
134 10, 134 251, 134 30, 134 40, 202152, 203 43, 210182, 210188, 210259, 210770, 210780, 210806, B01D 1102, B08B 704
Patent
active
055079539
ABSTRACT:
The method of cleaning soil contaminated with contaminants includes comminuting contaminated soil to form a comminuted contaminated soil; filling the comminuted contaminated soil into a countercurrent extractor from above under an inert gas atmosphere so that the comminuted contaminated soil moves as a travelling bed downward through the countercurrent extractor; feeding a solvent, advantageously acetone, into a lower portion of the countercurrent extractor so that the solvent flows upward through the travelling bed to form a decontaminated soil at the bottom of the extractor and a contaminant-charged solvent portion taken from a middle portion; supplying a conveying liquid to the lower portion of the countercurrent extractor so as to transfer the decontaminated soil from the countercurrent extractor to a filter device having a belt filter; and separating the decontaminated soil in the filter device into a cleaned soil and a reusable conveying liquid. A feeder device is provided for the filter device which avoids clogging of the moving belt filter by the soil when the soil has a high proportion of silt.
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"Extraktion von Feststoffen", Ullmann's Encyclopedia of Chemical Technology, vol. 2, pp. 722-729., Undated.
"Extraction as a Method for Cleaning Contaminated Soil: Possibilities, Problems and Research", 1984, Rulkens, et al, pp. 576-583.
Machlitt Rainer
Meyer Frank
Drodge Joseph W.
Flakus Peter
Muehr Horst
Striker Michael J.
Wessling Erwin
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