1
George B Karnofsky: Process and apparatus for solvent extraction of oil from oil-containing diatomite ore. September 11, 1979: US04167470 (22 worldwide citation)

A process for solvent extraction of oil from oil bearing diatomite ore and an apparatus for use therewith, wherein the ore is extracted by countercurrent decantation with a hydrocarbon solvent, solvent is recovered from the extract by multiple effect evaporation followed by stripping, and the spent ...


2
George B Karnofsky: Process and apparatus for solvent extraction of oil from oil-containing diatomite ore. Parmelee Miller Welsh & Kratz, December 16, 1980: US04239617 (8 worldwide citation)

A process for solvent extraction of oil from oil bearing diatomite ore and an apparatus for use therewith, wherein the ore is extracted by countercurrent decantation with a hydrocarbon solvent, solvent is recovered from the extract by multiple effect evaporation followed by stripping, and the spent ...