An analytical expression is obtained for the dependence of the pour point of diesel fuels on the pour point and weight relationship of the initial components. For determining the pour point of a multicomponent fuel mixture, it is assumed that the mixture of two components has the pour point of a separate equivalent component, then calculating the pour point of this equivalent component mixed with a third component, etc

Bobrovskiy, S. A.

Ostashov, V. M.

English

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NASA TM-75424
DEPENDENCE OF THE POUR POINT OF DIESEL FUELS ON THE
PROPERTIES OF THE INITIAL COMPONLNTS
V. M. Ostashov, S. A. Bobrovskiy, and A. Ye. Kurasov
(NASD-T11-75824) DEPENDENCE OF THE PONE
	 1179-21217
POINT OF DIESEL FUELS ON THE PROPERTIES OF
THE INITIAL CORPONENTS (National ,ar©nautics
and Space Adsiaistration) 8 p HC AO2/aF A01
	 Unclas
CSCL 21D 63/28 20260
Translation of "Zavisimost' temperatury zastyvaniya
dizel'nykh topliv of svoysty iskhodnykh komponentov",
Trudy, Moskovskiy Institut Neftekhimicheskoy i Gasovoy
Promyshlennosti, No. 87, 1971, pp. 124-126.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
WASHINGTON, D.C. 20546	 APRIL 1979
DEPENDENCE OF THE POUR POINT OF DIESEL FUELS ON THE
PROPERTIES OF THE INITIAL COMPONENTS
Y. M. Ostashov, S. A. Bobrovskiy, and A. Ye. Kurasov
One of the important characteristics of the quality of	 124*
commercial diesel fuels is their pour point, determined
according to All-Union State Standard 1533-42.
Diesel fuels are prepared by the method of blending of 	 \
individual hydrocarbon fractions. In addition, with the
storage of diesel fuels in bulk plants, the necessity often
occurs of reducing their pour point by means of the addition
of a lighter petroleum ')roduct.
In this and other cases, in order to determine the
relationship of the initial products in order to produce a
diesel fuel with the required pour point, it is necessary
to know the dependence of the pour point of the mixture on
the properties and relationship of the initial components.
In practice, in order to select a formula prior to each
blending, it is necessary to resort to the preparation of a
number of control mixtures, which requires large time expendi-
tures.
In order to find the analytic dependence which would
make it possible to determine the pour point of diesel fuels,
according to the pour points and per cent relationship of the
initial components, without carrying out laboratory analyses,
we determined the pour points of mixtures prepared from pro-
ducts with different pour points in different weight relation-
ships.
*Numbers in the margin indicate pagination in the foreign text.
1
The properties of the initial components, from which the
mixtures were prepared, are given in table 1.
TABLE 1
CHARACTERISTICS OIL INITIAL COMPONENTS
Blto^aeitnt
*ray 	 9
(q
13ss—tr
 !► 'C
C Wpmaar Mmmok roman . . .... 9+f0
Ao 
-F13
BauppwuA Boron . . . . . . .
f 4WKaU ruApooqucrxa .. . .... Or —8 Ao —12OpLwna Kara MIKKaro KPONUM Or —3 AO —10
$ Upwo w A	 .. ..... . .. . —50
12
Key: a. Components
b. Pour point
(according to
All-Union State
Standard 1533-42),
0 
c. Fraction of direct
distillation
d. Vacuum distillate
e. Fraction of hydro-
refining
f. Fraction of cata-
lytic cracking
g. Product A
h. From ... to
Mathematical processing of the experimental data made
it possible to obtain the analytic expression of the depen-
dence of the pour point of diesel fuels on the pour point
avid per cent relationship . of the initial components.
t—tj+(t=—tl) (0.86s +O.3U).	 (1)
where t is the pour point of the mixture, in 0C; t i is the
highest of the pour points of the two blended components, in
oC; t 2 is the lowest of the pour points of the two blended
components, in oC; x is the weight portion of the component
in the mixture which has the lower pour point.
In order to determine the pour point of a multicomponent
mixture, having calculated the pour point of the mixture of
-tile first and second components, it is necessary to use this
2
latter pour point as the pour point of a separate equiva-
lent component: and to further calculate the pour point of
a mixture of the equivalent component and a third component,
and so on.
Compared in table 2 are the values of the pour points
of diesel fuels, calculated according to formula (1) and
determined by laboratory analyses according to All-Union
State Standard 1533 -42.
TABLE 2
COMPARISON OF VALUES OF THE POUR POINTS OF DIESEL FUELS,
CALCULATED ANALYTICALLY AND DETERMINED ACCORDING TO
ALL-UNION STATE STANDARD 1533-42
dam+
11 Imes MW
T^ g °il0'°"'01"•
°:	
4
dot--
sums
Plh11" no JIM so
mpsoro ^"011"o e ( ibR, 1133-42 T 3 -42.
1 13 —10 0,4 6.7 7 —0.3
2 13 —i0 0.6 1,5 2 —0.5
3 13 —10 0,8 —5 —4 —1
4 —1 —12 0,2 —2 —2 0
5 —1 —12 0.5 —4.7 —5 Q3
6 —1 —12 0,8 —8,65 —9 0,35
7 14 —50 0.02 13.5 12 1,5$ 14 —50 0,3 4,2 6 —i.8
Key: a. Mixture
b. Pour point of
components, oC
c. first
d. second
e. Content in mixture
of component with
lower pour point,
in parts of unit
f. Pour point of
mixture, oC
g. calculated according
to formula (1)
h. determined according to
All-Union State Standard
1533-42
i. Difference between pour
points calculated accord-
ing to formula ( 1) and de-
termined according to All-
Union State Standard 1 533-
42, oC
Example. We will determine the pour point of the diesel	 126
fuel produced by blending 10%. by weight, of component 1, with
3
.a pour point of +140 C, 20% of component 2 9 with a pour
point of -500 C, and 70% of component 3, with a pour point
of -130
 C.
1. Components 1 and 2 are examined. The equivalent
content of the component with a lower pour point is deter-
mined in a mixture of these two components (this is com-
ponent 2 in the given ease):
_-Sol	 (2)
where x. 1 is the equivalent content of component 2 in the
mixture, in parts of a units xa is the content of component
2 in the mixture in parts of a unit= x l is the content of
component 1 in the mixture, in parts of a unit.
=si __ 0.1 
oa
-(-0.2 —0.67.
2. Determined a , -, cording to formula (1) is the pour
point which is equivalent to the pour polrit of the mixture
consisting of components 1 and 2.
t=14+((-50)— (-14)( (0.66 . 0.672 004.0.67)- -19.5°C.
3. Determined according to formula (1) is the pour
point of the equivalent and third components, i.e., the pour
point of the prepared mixture
t — 
—13 + ((-19,5) — (-13)1(0,66 . 0eV+0,34 . 0,3) — —14° C.
The pour point of such a mixture, determined by labora-
tory analysis according to All-Union State Standard 1533-42,
is equal to -130
 C.
4
Cgnolusioris
A formula is obtained which makes it possible, without
conducting laboratory analyses t
 to sufficiently accurately
determine the pour point of diesel fuels, according to the
pour points and percent weight relationship of the initial
components.
Ism-
REFERENCES
1. Nefte]2roduktv. Metody ispytaniX. C st' 1 [Petroleum Pro-
ducts. Testing Methods. Part 1 , State Committee of Stan-
dards, Measures, and Measuring Instruments of the USSR,
Moscow, 1965-
2. Borodyuk, V. P., Chirkov, I. M., "Poluchenie matemati-
cheskogo opisaniya metodami passivnogo i aktivnogo eks-
perimentov" [Obtaining a Mathematical Description by
Methods of Passive and Active Experiments], Trudy MEI,
No. 51 (1963).
3. Lukomskiy, Ya. I., Teori a korrel atsii i ee prilozhenie
k an lizu Proizvodstva Lcorrelation Theory and its Appli-
cation to Production Analysis], Gosstatizdat, 1958.
4. Brownleck, K. A., "Prilozhenie metodov korrelyatsii k
obrabotke proizvodstvennykh dannykh" [Application of
Correlation Methods to the Processing of Production Data],
Ind. Eng. Chem. 43, 9 (1951) .
6


Dependence of the pour point of diesel fuels on the properties of the initial components

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