Improved solvent extraction recovery of shale oil. [DOE patent application] Page: 4 of 14
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IMPROVED SOLVENT EXTRACTION RECOVERY OF SHALE OIL
Background of the Invention:
The present invention relates to an improved
process for the recovery of organic matter from oil
5 shale. More particularly, the present invention relates
to the recovery of sorganic matter at relatively low
temperatures. Still more particularly, the present
invention relates to high recoveries of organic matter
from oil shale at relatively low temperatures using
10 solvent extraction.
Theorganic matter in oil shale has been
described in the scientific literature as bitumen,
kerogen, or shale oil. These terms describe portions of
the organic matter removed from the oil shale under
15 specific conditions. The term "bitumen" is defined as
the portion of organic matter, that is soluble in organic
solvents at their refluxing temperature; kerogen is the
portion of organic matter that is not. .soluble, in organic
solvents at their refluxing temperature; and shale oil
20 is the liquid product produced from the organic matter
by thermal degradation or solvent extraction under
The generally recognized shortage of conven-
tional petroleum resources in the world has necessitated
25 the focus of attention on other fossil-based deposits
for peLro1eum-type or petroleum precursor resources.
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McKay, J.F. & Chong, S.L. Improved solvent extraction recovery of shale oil. [DOE patent application], text, July 20, 1981; (digital.library.unt.edu/ark:/67531/metadc1074311/m1/4/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.