ASTM D611-01b
(Test Method)Standard Test Methods for Aniline Point and Mixed Aniline Point of Petroleum Products and Hydrocarbon Solvents
Standard Test Methods for Aniline Point and Mixed Aniline Point of Petroleum Products and Hydrocarbon Solvents
SCOPE
1.1 These test methods cover the determination of the aniline point of petroleum products and hydrocarbon solvents. Method A is suitable for transparent samples with 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. Method B, a thin-film method, is suitable for samples too dark for testing by Method A. Methods C and D are for samples that may vaporize appreciably at the aniline point. Method D is particularly suitable where only small quantities of sample are available. Method E describes a procedure using an automatic apparatus suitable for the range covered by Methods A and B.
1.2 These test methods also cover the determination of the mixed aniline point of petroleum products and hydrocarbon solvents having aniline points below the temperature at which aniline will crystallize from the aniline-sample mixture.
1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Sections 7.
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An American National Standard
Designation: D 611 – 01b
Designation: 2/98
Standard Test Methods for
Aniline Point and Mixed Aniline Point of Petroleum Products
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and Hydrocarbon Solvents
This standard is issued under the fixed designation D 611; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
These test methods were adopted as a joint ASTM-IP standard in 1964.
This standard has been approved for use by agencies of the Department of Defense.
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1. Scope Dispersion of Hydrocarbon Liquids
D 1500 Test Method for ASTM Color of Petroleum Prod-
1.1 These test methods cover the determination of the
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ucts (ASTM Color Scale)
aniline point of petroleum products and hydrocarbon solvents.
D 2700 Test Method for Motor Octane Number of Spark-
Method A is suitable for transparent samples with an initial
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Ignition Engine Fuel
boiling point above room temperature and where the aniline
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E 1 Specification for ASTM Thermometers
point is below the bubble point and above the solidification
point of the aniline-sample mixture. Method B, a thin-film
3. Terminology
method, is suitable for samples too dark for testing by Method
3.1 Definitions:
A. Methods C and D are for samples that may vaporize
3.1.1 aniline point—the minimum equilibrium solution
appreciably at the aniline point. Method D is particularly
temperature for equal volumes of aniline and sample.
suitable where only small quantities of sample are available.
3.1.2 mixed aniline point—the minimum equilibrium solu-
Method E describes a procedure using an automatic apparatus
tion temperature of a mixture of two volumes of aniline, one
suitable for the range covered by Methods A and B.
volume of sample, and one volume of n-heptane of specified
1.2 These test methods also cover the determination of the
purity.
mixed aniline point of petroleum products and hydrocarbon
solvents having aniline points below the temperature at which
4. Summary of Test Methods
aniline will crystallize from the aniline-sample mixture.
4.1 Specified volumes of aniline and sample, or aniline and
1.3 This standard does not purport to address all of the
sample plus n-heptane, are placed in a tube and mixed
safety concerns, if any, associated with its use. It is the
mechanically. The mixture is heated at a controlled rate until
responsibility of the user of this standard to establish appro-
the two phases become miscible. The mixture is then cooled at
priate safety and health practices and determine the applica-
a controlled rate and the temperature at which two phases
bility of regulatory limitations prior to use. Specific precau-
separate is recorded as the aniline point or mixed aniline point.
tionary statements are given in Section 7.
5. Significance and Use
2. Referenced Documents
5.1 The aniline point (or mixed aniline point) is useful as an
2.1 ASTM Standards:
aid in the characterization of pure hydrocarbons and in the
D 1015 Test Method for Freezing Points of High-Purity
2 analysis of hydrocarbon mixtures. Aromatic hydrocarbons
Hydrocarbons
exhibit the lowest, and paraffins the highest values. Cyclopar-
D 1217 Test Method for Density and Relative Density
2 affins and olefins exhibit values that lie between those for
(Specific Gravity) of Liquids by Bingham Pycnometer
paraffins and aromatics. In homologous series the aniline
D 1218 Test Method for Refractive Index and Refractive
points increase with increasing molecular weight. Although it
occasionally is used in combination with other physical prop-
1 erties in correlative methods for hydrocarbon analysis, the
These test methods are under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricantsand are the direct responsibility of D02.04 on
Hydrocarbon Analysis.
Current edition approved Dec. 10, 2001. Published February 2002. Originally
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published as D 611 – 41 T. Last previous edition D 611 – 01a. Annual Book of ASTM Standards, Vol 05.05.
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Annual Book of ASTM Standards, Vol 05.01. Annual Book of ASTM Standards, Vol 14.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D611
NOTE 4—The aniline point of aniline and n-heptane determined with
aniline point is most often used to provide an estimate of the
automatic apparatus (Method E) shall be 69.3 6 0.2°C (156.7°F 6 0.4°F)
aromatic hydrocarbon content of mixtures.
when corrected in accordance with the equation in Section A5.2.1
NOTE 5—As an alternative to distilling the aniline on the day of use, the
6. Apparatus
aniline may be distilled as described i
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