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Патент USA US2132350

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Patented Oct. 4, 1938
2,132,350 '
Louis A. Clarke, Fishkill, N. Y., assignor to The
Texas Company, New York, N, Y., a corpora
tion of Delaware
No Drawing.’ Application June 5, 1937,
Serial No. 146,587
2 Claims. (Cl. 196-43)
This invention relates to re?ning hydrocarbon tively high yield of ra?inate was obtained, namely,
oil, and more particularly to re?ning mineral oil 88%, having a viscosity index of 70, as compared
by solvent extraction.
with a viscosity index of 5'7 for the original dis
The invention contemplates the solvent ex
5 traction of hydrocarbon oil with a selective solvent
Oil of still higher viscosity index, of course, can 5
comprising resorcinol monoacetate to separate the be obtained by altering the solvent proportions
oil into fractions having different characteristics. '
and the extraction temperature, in which case a
I have discovered that resorcinol monoacetate somewhat lower yield of raf?nate, corresponding
is particularly suitable as a solvent re?ning agent .to the higher viscosity index, would be obtained.
10 for mineral oil, and especially for the re?ning of
lubricating oil fractions derived from petroleum.
I have also discovered that this solvent, when
used for treating mineral lubricating oil, permits
obtaining a high yield of high viscosity index oil
It is, therefore, contemplated that extraction
temperatures, either below or above that' speci
?ed above, may be used. Likewise, the solvent
dosage may be varied as, for example, from one
15 having a good color as well as other desirable
to four parts of solvent to one of oil. These
factors can be varied, depending upon the nature
characteristics. In this respect, it is superior to
many of the known selective solvents; that is,
it is possible to obtain high viscosity index oil
the degree of extraction desired.
While a distillate oil has been referred to above
of good color without substantially sacri?cing‘ the
Treatment of the oil with the solvent may be
effected by stage or continuous countercurrent
contact. In either case, the mixture of oil and
solvent is separated into extract and ra?inate
phases. The extract phase comprises the so
called naphthenic or low viscosity index con
stituents of the oil dissolved in the main body of
the solvent, While the raffinate phase comprises
the so-called para?inic or high viscosity index
constituents of the oil mixed with a small portion
30 of
the solvent.
The two phases are separated, and the solvent
removed therefrom by distillation or by some
other means, for example, washing or displacing
35 the solvent from the oil by contact with some
other liquid or solvent.
As a speci?c example, a lubricating oil dis
tillate obtained from Mid-Continent crude, and
having the tests indicated below was extracted
of the oil undergoing treatment as well as upon
in the speci?c example, it is, of course, contem
plated that residual fractions may also be treated
with the solvent. The solvent is also useful in
the extractive treatment of other petroleum frac
tions as, for example, naphtha, kerosene, etc.
When treating lubricating oil stock, the oil may
be diluted with a suitable diluent such as a low
boiling petroleum hydrocarbon, and the dilute 25
mixture subjected to extraction with the solvent.
Obviously, many modi?cations and variations
of the invention, as hereinbefore set forth, may
be made without departing from the spirit and
should be imposed as are indicated in the ap
pended claims.
I claim:
1. In the re?ning of hydrocarbon oil containing 35
relatively para?'inic and relatively non-para?inic
constituents to separate the oil into fractions re- 4
spectively rich in paraihnic and non-para?inic
constituents, the method which comprises mixing
40 with resorcinol monoacetate, using three parts of
the oil with a selective solvent comprising res
solventto one part of distillate, and at a tempera
ture of about 237° F. The mixture was separated
into extract and ra?inate phases, and the ra?inate
phase, upon removal of the solvent liquid, com
4.5 prised about 88% by volume of the original dis
orcinol monoacetate, forming an- extract phase
The tests on the distillate before extraction,
and on the resulting ra?inate oil, were as follows:
scope thereof, and therefore only such limitations
containing non-parai?nic constituents dissolved
in the solvent and a ra?inate phase comprising
para?inic constituents of the oil, and separating
the two phases.
2. The method of treating mineral lubricating
oil containing relatively para?inc and relatively
non-parai?nic constituents to separate the oil into
fractions respectively rich in paraffinic and non
para?‘lnic constituents comprising mixing the oil 50
with a selective solvent comprising r-esorcinol '
monoacetate, forming an extract phase contain
ing non-paraffinic constituents dissolved in the
S. U. viscosity at 210° F._
solvent and a ra?inate phase comprising paraf?nic
Viscosity index __________ ._
Gravity, A. I’. I ________________________ _.
Color Tag. Rob __________ __
21. 7
S. U. viscosity at 100° F____
Viscosity gravity constant. . _ _
From the foregoing, it is observed that a rela
constituents of the oil, and separating the two 55
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