The aniline point test determines the lowest temperature at which equal volumes of aniline and an oil sample fully mix. A lower aniline point indicates a higher aromatic content in the oil sample. The test is suitable for transparent liquid samples with an initial boiling point above room temperature. The aniline point can be used to estimate properties like cetane number, diesel index, and aromatic content, which provide information about the oil sample's combustion quality and suitability for diesel fuel. Extracting the oil sample with furfuraldehyde can lower its aromatic content and thus increase the aniline point.

1. Aniline point for petroleum
products
Prepared by: NIAZ SALIH M.

2. ANILINE POINT
Aniline Point "aniline point temperature," Lowest
temperature (°F or °C) at which equal Volumes
of fresh aniline (C6H5NH2) and an oil are
completely miscible(form a single phase).

3. How we do aniline point test?
Equal volumes of aniline and oil are stirred
continuously in a test tube and heated until the
two merge into a homogeneous solution.
Heating is stopped and the tube is allowed to
cool. The temperature at which the two phases
separate out is recorded as aniline point

4. This method is suitable for transparent liquid
samples having an initial boiling point above
room temperature and where the aniline point
is below the bubble point and above the
solidification point of the aniline sample
mixture

5. The equipment covers Method A for transparent
samples, Method B for dark samples, Method C
& D for volatile products.

6. ANILINE POINT
The relative aromatic content of an oil is
indicated by its aniline point.
Oils having a high aromatic content have a low
aniline point,
since aniline is an aromatic compound which
is dissolved on heating by the aromatics in
diesel oil.
LIKE DESOLVE LIKE

7. In homologous series the aniline
points increase with increasing molecular weight
point have indicated that oils with a high
aromatic content were more detrimental to
rubber products than those with a low aromatic
content.

8. for an aromatic oil with a 75%aromatic content,
the aniline point would be between 32.2° and
48.9°C;
for a naphthenic type containing 40%
aromatic structures, it would be between 65.6°
and 76.7°C;
and for a paraffinic oil with a15%
aromatic content it would be between 93.3°
and 126.7°C.

9. What is aniline

10. What is aniline ?
An organic base belonging to the phenylamines.
It may be regarded as ammonia in which one
hydrogen atom has been replaced by the
radical phenyl.
It is a colorless, oily liquid, originally obtained
from indigo by distillation, but now largely
manufactured from coal tar or nitrobenzene
as a base from which many brilliant dyes are
made.

11. High aniline point
The greater the aniline point, the lower the
aromatics in diesel oil.
A higher aniline point also indicates a
higher proportion of paraffin.

12. What is paraffin?
paraffin is the common name for
the alkane hydrocarbons with the general
formula CnH2n+2.
Paraffin wax refers to the solids with
20 ≤ n ≤ 40 .

13. Aniline point used to determine cetane number
and Disel index.
Cetane no.=0.72*D.I + 10
aniline po int o F x Degrees API gravity 60 o F
Diesel Index
100

14. Cetane number
CN is a measurement of the combustion quality
of diesel fuel during compression ignition. It is a
significant expression of the quality of a diesel fuel.
A number of other measurements determine overall
diesel fuel quality - these other measures of diesel
fuel quality include density, lubricity, cold-flow
properties, and sulfur content

15. Diesel Index
The Diesel Index indicates the ignition quality of the
fuel. It is found to correlate, approximately, to the
cetane number of commercial fuels. It is obtained by
the following equation
aniline po int o F x Degrees API gravity 60 o F
Diesel Index
100
high-quality fuel has a high index number.

16. We can improvement aniline point by extraction
with furfuraldehyde to decrease aromatic
content in petroleum productes.

17. references:
http://en.wikipedia.org/wiki/Aniline_point
http://www.scribd.com/doc/40398724/Aniline-
Point-Lab-Report
http://www.wisegeek.com/what-is-the-aniline-
point.htm
http://www.sizes.com/units/cetane_number.ht
m
http://encyclopedia2.thefreedictionary.com/die
sel+index