Priolene™ 6936
High purity oleic acid (90%)
Priolene™ 6936
High purity oleic acid (90%)
Priolene 6936 is a new oleic acid that offers
exceptional oxidative and heat stability, as well as
good low temperature properties. Priolene 6936
has an oleic acid purity of more than 90% and an
extremely low concentration of polyunsaturated
fatty acids.
Linoleic and linolenic acid, the PUFAs present in
oleic acid, show a much higher relative oxidation
rate; their concentration is therefore the
determining factor in oxidation sensitivity and shelf
life. Priolene 6936 has an exceptionally low PUFA
content compared to regular oleic acid grades.
Benefits
The unique composition creates an attractive
combination of properties that bring the following
benefits to end applications:
Extended storage stability - for products with
long shelf-life requirements. A large reduction
in the need for preservatives and stabilisers can
be achieved.
Excellent odour stability - for many formulated
products eg cosmetics and cleaners
A very low colour and a good colour stability
Clarity at low temperature - for lubricants and
liquid detergent products
Stability towards oxidation and other reactions
- for high-temperature use and sensitive
chemical synthesis
100%
Composition and properties
Oleic acid is a liquid, unsaturated fatty acid. It is
often converted to derivatives such as oleate
esters for production of lubricants and surfaceactive agents, though there are also important
direct uses in personal care and detergent
products.
Regular oleic acid contains typically 10-13%
polyunsaturated fatty acids (PUFAs).These PUFAs
are especially susceptible to oxidation.The figure
below shows the relative oxidative rate of three
C18-chain fatty acids.
Linolenic acid
C18:3
Linoleic acid
C18:2
Oleic acid
C18:1
0
20
40
60
80
100 120 140 160 180 200
Relative Oxidation Rate
90%
85%
80%
75%
70%
65%
Oleic acid
(tallow)
Oleic acid
(vegetable)
Others
PUFAs C18:2 & 3
High oleic
sunflower FA
Priolene
6936
Saturated FA
Oleic C18:1
The high oleic acid content 'forces' undesirable
saturated and polyunsaturated fatty acids out of
the specification, so that good low and high
temperature properties are simultaneously
achieved.
Oxidation Stability Measurement
High pressure differential scanning calorimetry
(ASTM D 6186-98) is a test to determine the
oxidation stability of the product, exposing it to
pure oxygen at high temperature (130ºC) and
measuring the time taken for degradation. Four
oleic grades were tested by this method:
Wgn-1
Until now, there was no oleic acid available in
industrial quantities meeting simultaneously all
these needs.
Priolene 6936 provides formulators with the
flexibility to create innovative products that
improve the quality of life in applications such as:
Personal care
Surfactants
Health care
Fine chemicals
Lubricants
Lowest
PUFAs!
95%
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
5
10
15
20
25
30
35
40
45
50
55
60
Minutes
-1.6
Oleic acid (tallow)
Priolene 6936
High oleic sunflower FA
Blanched oleic (vegetable)
Results of the HP-DSC (ASTM D 6186-98) test, all four tested oleic
grades contained 0.5% alpha-tocopherol
Colour stability
The relative heat stability (AOCS method Td 3a64) is a typical method to test oxidation stability;
this method is based on a heat treatment of 1
hour at 205ºC followed by a colour
measurement. Products that are sensitive to
oxidation will give a higher colour after the heat
treatment. From the four tested oleic grades,
Priolene 6936 showed by far the best colour
stability.
APHA
Relative heat Stability
300
Oleic acid (tallow)
250
Oleic acid (vegetable)
200
High oleic sunflower FA
Priolene 6936
150
100
-50
0
Results of the relative heat stability test (AOCS method Td 3a-64)
TOST test
Lubricants is an application field where high
performance and long life times under severe
conditions are key. A laboratory test method
widely used for evaluating the oxidation stability
is ASTM D 943, also known as the Turbine
Oxidation Stability Test (TOST). In this test, pure
oxygen is bubbled through a mixture of lubricant
and water in the presence of copper and iron
wire catalysts at 95°C.The TOST life is reported
as the time in hours for the lubricant to reach
acidity (TAN-C) of 2.0.
Turbine Oil Stability Test
Industry target
5
AV (mg KOH/g)
The results show that Priolene 6936 has superior
stability in comparison with both tallow and
vegetable oleic acids, as well as high oleic
sunflower fatty acid.This superior stability is
coming through in two aspects of the oxidation
process:
The retention time for Priolene 6936 is much
longer, so the initial oxidation is delayed
The oxidation propagation rate is lowest for
Priolene 6936, as shown by the shallow slope
in the endogram
Samples stored for extended periods usually have
poorer stability in this test, because the oxidation
process has already started. Here the benefits of
the Priolene 6936 are even more pronounced,
especially versus high oleic sunflower fatty acid:
for Priolene 6936 there is hardly any ageing effect,
while high oleic sunflower oil fatty acid becomes
much more sensitive to oxidation after extended
storage
4
3
2
1
0
0
200
400
600
800
1000
1200
Time (hours)
Priolene 6936 based ester
Standard TMP oleate ester
Performance TMP oleate ester
Results
Standard TMP
oleate ester
Performance TMP
oleate ester
Priolene 6936
based ester
Hours
352
506
1184
Results of the TOST test, comparing 2 existing lubricant esters with
Priolene 6936 based lubricant ester
Existing standard grade and performance grade
TMP oleate lubricant esters were tested and
evaluated versus Priolene 6936 based lubricant
ester.The results of the standard life time tests for
lubricants (TOST tests) show that Priolene 6936
based esters have excellent oxidative stability,
resulting in a step change in life time performance.
Typical parameters
Acid value
Saponification value
Iodine value
Cloud point
Colour Lovibond 51/4"
Colour APHA
<C18
C18
C18:1
C18:2
C18:3
> C18
mgKOH/g
mgKOH/g
g/100g
°C
–
–
%
%
%
%
%
%
Typical value
198
199
92
9-10
0.6-0.1
25
<3
2
92
3
0.3
<1
In summary
Priolene 6936 is a product that has the
recognisable physical characteristics of oleic acid,
with an unrecognisably good performance under
thermal and oxidative stress.The exceptional
properties of Croda's Priolene 6936 open up
new and demanding applications where regular
oleic acids fall short.
Come and talk to us about your requirements
and explore the possibilities to boost the quality
and functionality of your products with Priolene
6936 from Croda.
Europe
Croda
Gouda The Netherlands
email: [email protected]
Americas
Croda
Atlas Point, New Castle
Asia Pacific
Croda
Singapore
For more information please visit: www.croda.com
The information in this publication is believed to be accurate and is given in good faith but no representation or warranty
as to its completeness or accuracy is made. Suggestions for uses or applications are only opinions. Users are responsible
for determining the suitability of these products for their own particular purpose. No representation or warranty, express or
implied, is made with respect to information or products including without limitation warranties of merchantability or fitness
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limit copyright, trademark and designs. Any trademarks identified herein are trademarks of the Croda group of companies.
©2008
OLEO/EU/06-08/0010/E&0.1K/DD