초록

Oil is efficiently solvent extracted from tar sands utilizing a trichloroethylene solvent at mild conditions. The process preferably utilizes minor amounts of surfactant and polyelectrolytes. The process has resulted in unexpectedly high yields of oil with unexpectedly low solvent loss.

대표청구항 ▼

In an oil solvent extraction process wherein a tar sand is contacted with a solvent at mild conditions of temperatures from 70°F. to about 800°F. and pressures from 0 to about 200 psig, the improvement wherein said solvent is trichloroethylene and wherein said solvent is contacted with said tar sand

In an oil solvent extraction process wherein a tar sand is contacted with a solvent at mild conditions of temperatures from 70°F. to about 800°F. and pressures from 0 to about 200 psig, the improvement wherein said solvent is trichloroethylene and wherein said solvent is contacted with said tar sand in a contact vessel; wherein the solvent and tar is removed from the upper portion of such vessel; wherein the sand is removed from the lower portion of such vessel and wherein the solvent is removed from the extracted tar for further use in the solvent extraction process.