ASTM D6296-98(2008)
(Test Method)Standard Test Method for Total Olefins in Spark-ignition Engine Fuels by Multidimensional Gas Chromatography
Standard Test Method for Total Olefins in Spark-ignition Engine Fuels by Multidimensional Gas Chromatography
SIGNIFICANCE AND USE
The quantitative determination of olefins in spark-ignition engine fuels is required to comply with government regulations.
Knowledge of the total olefin content provides a means to monitor the efficiency of catalytic cracking processes.
This test method provides better precision for olefin content than Test Method D 1319. It also provides data in a much shorter time, approximately 20 min following calibration, and maximizes automation to reduce operator labor.
This test method is not applicable to M85 or E85 fuels, which contain 85 % methanol and ethanol, respectively.
SCOPE
1.1 This test method provides for the quantitative determination of total olefins in the C4 to C10 range in spark-ignition engine fuels or related hydrocarbon streams, such as naphthas and cracked naphthas. Olefin concentrations in the range from 0.2 to 5.0 liquid-volume % or mass %, or both, can be determined directly on the as-received sample whereas olefins in samples containing higher concentrations are determined after appropriate sample dilution prior to analysis.
1.2 This test method is applicable to samples containing alcohols and ethers; however, samples containing greater than 15 % alcohol must be diluted. Samples containing greater than 5.0 % ether must also be diluted to the 5.0 % or less level, prior to analysis. When ethyl-tert-butylether is present, only olefins in the C4 to C9 range can be determined.
1.3 This test method can not be used to determine individual olefin components.
1.4 This test method can not be used to determine olefins having higher carbon numbers than C10.
Note 1—Precision was determined only on samples containing MTBE and ethanol.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 This standard does not purport to address all of the safety concerns, 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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D6296 −98(Reapproved 2008)
Standard Test Method for
Total Olefins in Spark-ignition Engine Fuels by
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Multidimensional Gas Chromatography
This standard is issued under the fixed designation D6296; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
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1.1 This test method provides for the quantitative determi- 2.1 ASTM Standards:
nation of total olefins in the C to C range in spark-ignition D1319 Test Method for Hydrocarbon Types in Liquid Petro-
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engine fuels or related hydrocarbon streams, such as naphthas leum Products by Fluorescent Indicator Adsorption
and cracked naphthas. Olefin concentrations in the range from D4052 Test Method for Density, Relative Density, and API
0.2 to 5.0 liquid-volume % or mass %, or both, can be Gravity of Liquids by Digital Density Meter
determined directly on the as-received sample whereas olefins D4307 Practice for Preparation of Liquid Blends for Use as
in samples containing higher concentrations are determined Analytical Standards
after appropriate sample dilution prior to analysis. D4815 Test Method for Determination of MTBE, ETBE,
TAME, DIPE, tertiary-Amyl Alcohol and C to C Alco-
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1.2 This test method is applicable to samples containing
hols in Gasoline by Gas Chromatography
alcohols and ethers; however, samples containing greater than
D5599 Test Method for Determination of Oxygenates in
15 % alcohol must be diluted. Samples containing greater than
Gasoline by Gas Chromatography and Oxygen Selective
5.0 %ethermustalsobedilutedtothe5.0 %orlesslevel,prior
Flame Ionization Detection
to analysis. When ethyl-tert-butylether is present, only olefins
in the C to C range can be determined.
4 9 3. Terminology
1.3 Thistestmethodcannotbeusedtodetermineindividual
3.1 Definitions of Terms Specific to This Standard:
olefin components.
3.1.1 trap, n—a device utilized to selectively retain specific
portions (individual or groups of hydrocarbons or oxygenates)
1.4 This test method can not be used to determine olefins
of the test sample and to release the retained components by
having higher carbon numbers than C .
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increasing the trap temperature.
NOTE 1—Precision was determined only on samples containing MTBE
and ethanol. 3.2 Acronyms:
3.2.1 ETBE—ethyl-tert-butylether.
1.5 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this 3.2.2 MTBE—methyl-tert–butylether.
standard.
4. Summary of Test Method
1.6 This standard does not purport to address all of the
4.1 A reproducible 0.2-µL volume of a representative
safety concerns, if any, associated with its use. It is the
sample, or a dilution thereof, is introduced into a computer
responsibility of the user of this standard to establish appro-
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controlled gas chromatographic system consisting of a series
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
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This test method is under the jurisdiction of ASTM Committee D02 on the ASTM website.
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Petroleum Products and Lubricantsand is the direct responsibility of Subcommittee The sole source of supply of apparatus known to the committee at this time, the
D02.04.0L on Gas Chromatography Methods. AC FTO Analyzer, is AC Analytical Controls, Inc., 3494 Progress Dr., Bensalem,
Current edition approved May 1, 2008. Published September 2008. Originally PA19020. If you are aware of alternative suppliers, please provide this information
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approved in 1998. Last previous edition approved in 2003 as D6296–98(2003) . to ASTM Headquarters. Your comments will receive careful consideration at a
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DOI: 10.1520/D6296-98R08. meeting of the responsible technical committee, which you may attend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6296−98 (2008)
FIG. 1Typical Flow Diagram and Component Configuration
of columns, traps, and switching valves operating at various 5.2 Knowledge of the total olefin content provides a means
temperatures. The valves are actuated at predetermined times to monitor the efficiency of catalytic cracking processes.
to direct portions of the sample to appropriate columns and
5.3 This test method provides better precision for olefin
traps. The sample first passes through a po
...
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