Process for extracting oil from contaminated filter media

Details Process for extracting oil from contaminated filter media Process for extracting oil from contaminated filter media

1997-07-08

1999-08-17

Therkorn, Ernest G.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210791, 210797, 208428, 502 20, 502 22, 502 28, B01D 1102

Patent

active

059389273

ABSTRACT:
Oil and oil additives separated from a contaminated solid particulate filter medium, preferably diatomaceous earth particles. Portions of a mixture of oil, oil additives and the filter medium are compressed into pellets that are extracted with liquid or supercritical CO.sub.2 to form a liquid solution. The solution is separated from the pellets and then heated to 20.degree.-60.degree. C. at a superatmospheric pressure to drive off CO.sub.2 gas, which is preferably recycled by compression into liquid or supercritical CO.sub.2.

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