Inventors:
Ronald A. Reich - Pittsburgh PA
Ronald P. Festa - New Kensington PA
Mark L. Weaver - Pittsburgh PA
Assignee:
Aluminum Company of America - Pittsburgh PA
International Classification:
B01D 1102
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.