ApplicationNo. 05/677523 filed on 04/16/1976
US Classes:208/390, TAR SAND TREATMENT WITH LIQUID196/14.52, SOLVENT EXTRACTION208/424Specified procedure to improve separation of solids from liquid product
ExaminersPrimary: Gantz, Delbert E.
Assistant: Hellwege, James W.
Attorney, Agent or Firm
International ClassesC10G 1/00 (20060101)
C10G 1/04 (20060101)
AbstractTar sands are put into finely divided form, preferably by pressing them into sheets and flaking the sheets. The flakes are mixed with a solvent for the contained oils for a time sufficient to extract the oils. The resulting slurry is introduced beneath the surface of a body of water and the solids allowed to settle, while the solvent containing the oil rises to the top to form a liquid phase above the surface of the body of water. The wet solids and the oil-containing solvent are separately removed. After the oil is recovered from the solvent, as by fractional distillation, the solvent is recycled in the process, which is preferably carried on as a continuous operation.