Note: Descriptions are shown in the official language in which they were submitted.
The in~ention rel~te~ ~o a method of ~tabilizing
d hydroc~a~ked oil~ ~ore particularly 7 ~t relate~
ts ~t~bil izinq ~c~ ga~t light de~eri~ration
~y ~dding there~ a l~as~ one Q~ certain ~i~ydroxy-
components.
~ t i8 ~tlDWll that Dils in qeneral will degrade~l~wly in the pre~ence of light. Oil~ ~uch as ~he
~c~nomica~ly v~lu~ble hydrocra~ed lubricating oils
used in hi~ invention, degrade in li~ht, especially
in the Dre~ence of air. Since the hydrocracked oils
are valuable, there has been considerable effort to
~ind ways to prevent their breakdown due to light.
U.S. Patent 4,036,770 ~eaches a method for
stabilizing hydrocracked oils which in~olves a~din~
nitro-containing aromatic amine c~mponent~. Such com~onents
~re relatively expensive and therefore m~y ~dd significantly
to the cost of the hydrocracked oils, Also~ such r~mponents
m~y impart a less than desirable ~olor an~/or odor to the final
product.
U~S. Patent 4,101,430 teache~ that oxidative
~egradation of lu~ricant co~po~ition6 containing certain
organo ~ulfur-c~ntaining nickel complexe~ is inhibited.
U.S. Patent~ 2,78~,18~ and 3,156,543 teach
the use ~f 3,3',5,5'-tetra alkyl-4t4~dihydroxy diphenyls
as o~idation ~tabilizer~ f~r hydr~Garbon fuels, ~uch
as gasoline. U.5. Pate~t 3,156,543 discloses ~ha~
~,4'~ (2-i~oprop~1-6 tert-butylphen~ s a light
yellow crystalline ~ub~thnce ~nd i~ highly soluble
in gasoline, ~iesel fuel and lu~ricating oil. ~owever,
~either of the~e xeferences teach either inhlbiti~
~f ~eterior~tion from livht expvsure ~r hydrocracked
lubricatiQg oil~.
~6,'~
One ~ject of the present inventi~n ih to
pr~Yide an improved me~hod for ~tabilizin~ hydrocracke~
lu~ricating ~ gain~ e aeteriorating effects
Df light~
AnDther object Or the inventi~n i~ -to provi~e
an impr~e CDm~iti~n o~ matter in~olvin~ a hydrocracked
?ubricating ~i~ ~hich has improved inhibi~ion again~t
deteriorati~n by light, Othes ~jects and advantages
Df the present invention will ~ecome apparent hereinafter.
An improved hydrocracked oil compo~ition
ha now been discovered. This com~osition comprises
a major amount, preferably at least about 70%, by
weight of a hydrocracked lubricating ~il an2 a minor
amoun~ by weigh~ ~f at least one added dihydroxy
~omponent havin~ a 6tructure:
;
lOH ,
(H)b 3_OH
~R) a
wherein each R is in~ependently selecte~ from the group
consisting o~ ~ubstantially monovalent hydrocarbonaceous
radicals containing 1 to abollt 24, pre~erably 1 to-
~be~ut 1~ and more prefer~bly 1 to about 10, carbon
atoms; and a and b are integers such that a is e~aual to
at least 2, preferably equal to 2, and the sum of a plus
b equals 4.
~ t is preferred that th~ hydrocarbonaceous
radical ~e ~ubstantially ~atura ed aliphatic radicals.
~ ~ 6~
Also, it is pxeferred that each of the R qrou~s include
at least ~ne textiary carbon atomO More preerably,
each of the R sroups has the same structure and, still more
preferab~y, each of the R groups i.s a tertiary butyl
group.
In a preferred emboaiment, the a~de~ dihydroxy-
diphenyl component compri~es about O . 005~ to ~bout 2 . 0%
more preferably, ab~ut 0.01% to about 1. 0%, by weight of
the total composition.
lQ The term "hydrocracked lubricating oil~ means
an oil, preferably a mineral oil, of lubricating viscosity
which is derived from a lubricating oil produced by
contac~ing a hydrocarhon feédstoc~ with hydrogen, preferably
: in the presence of ca~alyst effective to promote hydro
cracking, at hydrocarbon hydrocracking conditions to
~: produce an oil of lubricating viscosity having an increased
viscosity index relative to the visc~sity index of
: the hydrocarbon feedstock. In addition, the
hydrocracked lubricating oll may be subjected ~o addi~ional
processing, e.g., further contacting with hydrogen-
~: a~ain preferably in the ~resence of an effective catalyst-~
other purifying procedures and the like, to further
: ~mprove the guality, e~g~ 9 color, of the hydrocracked
lu~ricatinq oil, For example, hydrocracked lubricatin~
oils useful in the present inventi~n may be obtaine~
by the processes disclosed in U.S. Patent 3,642J610.
~ ypical examples of the ~ubstantially monovalent
hydrocarb~naceous radical~ from which R may be selected
incluaes alkyl,such a~ methyl, ethyl, propyl, butyl,
pentyl~ hexyl gincluding cyclohexyl), 05tvl, decyl,
the like; ~yl, ~uch ~ phenyl~ benzyl and the like;
alkaryl ~u~h a~ ~ethy~ phenyl, ethyl phenyl, butyl
phenyl, octyl ph~yl, ~ea~l phenyl And ghe like;
alkenaryl ~ch ~ e~hylenyl phenyl, octenyl phenyl,
oleyl phenyl and the like; ~ralkyl ~uch as ph~nyl ethyl,
phenyl o~tyl, phen~l stearyl a~d *he like; and ar~lkenyl
~uch as phenyl ~thylenyl, p~enyl butenyl, phenyl octenyl,
phenyl oleyl and ~he like. ~s no~ed above, it is preferred
that such hydrocarbonaceous radical~ be substantially
10 ~aturated.
By n substantially hydrocarbonaceo~s~ radical
is meant those radical~ which are comp~sed
mainly of hydro~en and carbon, and include such radicals ;~
which contain, in addition, minor amounts of ubstituents,
such as chlorine, bromine, ~ulfur, nitrogen and the
like, which do not substantially affect their hydrocarbon
characterO Preferably, such substantial.ly hydrocarbonaceous
radical~ include only ~rbon ~nd hydrogen ~toms.
The presen ly useful dihydroxy component m~y
be produced using procedures well known in the art.
The following example~ illustrate ~ore ~lear~y
the compositions and methods Df the present invention,
~owever, the6e illustra~ion~ 2re not to be interpreted
~pecific limitationfi on this inventicn.
EXAMæLES
These exam~les illustrate certain of the advantages
of the present invention.
A commercially available hydrocracked oil of
lubricating viscosity was selected for testing.
~his hydrocracked oil had the following properties.
Initial Boiling Point, F. ;~ 600
Viscosity, SU5 at 100~. 156.0
Viscosity Index 106
t~
This oil was deriv~d using a well known lube oil hydrocracking
process.
Varying amounts of 3~-di-tert-~uty~ catechol
were blended into samples of the hydrocracked ~il.
In order ~o ~etern~ine .he susce?tibi~.ity
~f the oils ~n~ ~len~ to lig~t deterioration, 10 gram
~amples were p~aced In ~5D ml. beaker~ ana exposed
to tw~ 12) 275 watt ~.V~ ~unlamps at se~en(7) in~hes
~n a r~tating table ~r a period of fifteen (15) hours.
After the fifteen (15~ ~our exposure periodr each of
the samples was processed to determine the amount of
E~l~ds Isludge) formation. The followi~ results were
obtained:
ydrocracked Oil 3,5-di-tert- Solids ~fter Exposure
butyl catechol mg.~ oil
weight percent
Sample 1 0.00 1.23
2 0.01 1.01
20 3 0.025 0.94
4 ~.05 ~.77
0.10 0 55
6 0.15 0.36
7 0.20 0.30
8 0.40 ~.16
9 0.70 0.~8
1~ ~.00 0.07
A series of fi~e additional compositions were
blended using the hydrocracked oil noted abo~e and 4,6-
di-tert-~utyl resorcinol. These five compositions were
tested using the above described procedure and the following
results were obtained:
~6~3~
4,6 di-tert- ~Glids After Exposure
buty~ re~orc~nol _ m~ m. oil
~ . .
0.20 0.43
1~ 0.40 ~.11
12 0.60 0.02
13 0.~0 0.00
14 ~.0~ 0.01
These results indicate that hydrocracked lubricating
oll alone is susceptible: to deterioration by sunlight.
~ he dihydroxy components, as set forth in the
present in~ention, are shown to provide ~ubstantial inhibition
of deterioration of hydrocracked oil by sunlight.
In addition, such dihydroxy components impart little or
no distaste~ul odor ~o the hydrocracked oil compositions.
This is in significant contrask to ~and is a substantial
benefit relative to) compositions which include various
of the nitrogen-containing materials which have been suggested
20 ~y the prior art for inhibiting light deterioration of h
hydrocxacked oils~ .
. While this invention has been described with
respect ~o various specific examples and embodiments, it
is to be understood that the inventisn is not limited thereto
: ~ and that it can be variously pra~ticed within the ~cope
~ f the fO11DWing claims:
