Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1988-12-22
1991-10-08
Dawson, Robert A.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
134 251, 134 26, 134 40, 2082621, 2082625, 210639, 210805, 210806, 210909, B01D 1102
Patent
active
050551965
ABSTRACT:
This invention relates to a process for treating soil and sludge for removal of contaminants in contact with the soil or sludge. More particularly, this invention relates to a process where contaminants such as inorganic contaminants such as metal or metal salts or organic contaminants such as PCBs are removed from water-wet soil and sludge. In particular, this invention relates to a process for treating or cleaning a contaminated water-wet solid containing mixture by contacting the contaminated water-wet mixture with a solvent, the solvent containing a comminuting surfactant. The solvent used is a solvent for the contaminant and is sparingly soluble in water. The purpose of adding a comminuting surfactant to the solvent is to form a dispersed mixture of the solids, contaminants, and water whereby the contaminants are extractable into the solvent. The solvent containing the contaminants is easily separated from the solids and then the solvents and contaminants are separated and the solvent is reused. The solvent is preferably a hydrocarbon solvent containing a comminuting surfactant.
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Darian Saeed T.
Weinberg Stephen P.
Dawson Robert A.
Drodge Joseph
Ensr Corporation
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