ASTM D7504-12

Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon Number

SIGNIFICANCE AND USE
Determining the type and amount of hydrocarbon impurities remaining from the manufacture of toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene, benzene, and styrene used as chemical intermediates and solvents is often required. This test method is suitable for setting specifications and for use as an internal quality control tool where these products are produced or are used. Typical impurities are: alkanes containing 1 to 10 carbons atoms, benzene, toluene, ethylbenzene (EB), xylenes, and aromatic hydrocarbons containing nine carbon atoms or more.
This method may not detect all components and there may be unknown components that would be assigned inappropriate response factors and thus, the results may not be absolute.
SCOPE
1.1 This test method covers the determination of the total nonaromatic hydrocarbons and trace monocyclic aromatic hydrocarbons in toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene, benzene, and styrene by gas chromatography. The purity of toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene, benzene, and stryene can also be calculated. Similar test methods, using the internal standard calibration technique and the external standard calibration technique, are Test Methods D2360, D3797, D4492, D5060, D5135, D5917, and D6563 respectively.
1.2 Total aliphatic hydrocarbons containing 1 through 10 carbon atoms (methane through decanes) can be detected by this test method at concentrations ranging from 0.0001 to 2.5000 weight %.
1.2.1 A small amount of benzene in toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene, or styrene may not be distinguished from the non-aromatics and the concentrations are determined as a composite (see 6.1).
1.3 Monocyclic aromatic hydrocarbon impurities containing 6 through 10 carbon atoms (benzene through C10 aromatics) can be detected by this test method at individual concentrations ranging from 0.0001 to 2.5000 weight %.
1.4 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E29.
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

• Status: Historical
• Publication Date: 14-Mar-2012
• ICS: 71.080.15 - Aromatic hydrocarbons
• Technical Committee: D16 - Aromatic, Industrial, Specialty and Related Chemicals
• Drafting Committee: D16.01 - Benzene, Toluene, Xylenes, Cyclohexane and Their Derivatives

Relations

• Replaced By: ASTM D7504-15 - Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon Number
• Effective Date: 01-Jul-2015

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7504 − 12
StandardTest Method for
Trace Impurities in Monocyclic Aromatic Hydrocarbons by
1
Gas Chromatography and Effective Carbon Number
This standard is issued under the fixed designation D7504; 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* priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
1.1 This test method covers the determination of the total
nonaromatic hydrocarbons and trace monocyclic aromatic
2. Referenced Documents
hydrocarbons in toluene, mixed xylenes, p-xylene, o-xylene,
2
ethylbenzene, benzene, and styrene by gas chromatography. 2.1 ASTM Standards:
The purity of toluene, mixed xylenes, p-xylene, o-xylene, D841 Specification for Nitration Grade Toluene
ethylbenzene, benzene, and stryene can also be calculated. D1555M TestMethodforCalculationofVolumeandWeight
Similar test methods, using the internal standard calibration of Industrial Aromatic Hydrocarbons and Cyclohexane
technique and the external standard calibration technique, are [Metric]
Test Methods D2360, D3797, D4492, D5060, D5135, D5917, D2360 Test Method for Trace Impurities in Monocyclic
and D6563 respectively. Aromatic Hydrocarbons by Gas Chromatography
D3437 Practice for Sampling and Handling Liquid Cyclic
1.2 Total aliphatic hydrocarbons containing 1 through 10
Products
carbon atoms (methane through decanes) can be detected by
D3797 Test Method for Analysis of o-Xylene by Gas Chro-
this test method at concentrations ranging from 0.0001 to
matography
2.5000 weight %.
D4492 Test Method for Analysis of Benzene by Gas Chro-
1.2.1 Asmall amount of benzene in toluene, mixed xylenes,
matography
p-xylene, o-xylene, ethylbenzene, or styrene may not be
D4790 Terminology ofAromatic Hydrocarbons and Related
distinguished from the non-aromatics and the concentrations
Chemicals
are determined as a composite (see 6.1).
D5060 Test Method for Determining Impurities in High-
1.3 Monocyclicaromatichydrocarbonimpuritiescontaining
Purity Ethylbenzene by Gas Chromatography
6 through 10 carbon atoms (benzene through C aromatics)
10
D5135 Test Method for Analysis of Styrene by Capillary
canbedetectedbythistestmethodatindividualconcentrations
Gas Chromatography
ranging from 0.0001 to 2.5000 weight %.
D5136 Specification for High Purity p-Xylene
D5211 Specification for Xylenes for p-Xylene Feedstock
1.4 In determining the conformance of the test results using
this method to applicable specifications, results shall be D5917 Test Method for Trace Impurities in Monocyclic
Aromatic Hydrocarbons by Gas Chromatography and
rounded off in accordance with the rounding-off method of
Practice E29. External Calibration
D6229 Test Method for Trace Benzene in Hydrocarbon
1.5 The values stated in SI units are to be regarded as
Solvents by Capillary Gas Chromatography
standard. No other units of measurement are included in this
D6563 Test Method for Benzene, Toluene, Xylene (BTX)
standard.
Concentrates Analysis by Gas Chromatography
1.6 This standard does not purport to address all of the
D6809 Guide for Quality Control and Quality Assurance
safety concerns, if any, associated with its use. It is the
Procedures for Aromatic Hydrocarbons and Related Ma-
responsibility of the user of this standard to establish appro-
terials
E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
1
This test method is under the jurisdiction of ASTM Committee D16 on
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their
2
Derivatives. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 15, 2012. Published March 2012. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2009. Last previous edition approved in 2011 as D7504 - 11. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7504-12. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D7504 − 12
E177 Practice for Use of the Terms Precision and Bias in 6.2 Thecompleteseparationof p-xylenefromethylbenzene,
ASTM Test Methods or ethylbenzene and m-xylene from p-xylene can be difficult
E260 Practice for Packed Column Gas Chromatography when either ethylbenzene or p-xylene is ana
...

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D7504–11 Designation: D7504 – 12
Standard Test Method for
Trace Impurities in Monocyclic Aromatic Hydrocarbons by
1
Gas Chromatography and Effective Carbon Number
This standard is issued under the fixed designation D7504; 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*
1.1 This test method covers the determination of the total nonaromatic hydrocarbons and trace monocyclic aromatic
hydrocarbons in toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene, benzene, and styrene by gas chromatography. The
purity of toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene, benzene, and stryene can also be calculated. Similar test
methods,usingtheinternalstandardcalibrationtechniqueandtheexternalstandardcalibrationtechnique,areTestMethodsD2360,
D3797, D4492, D5060, D5135, D5917, and D6563 respectively.
1.2 Total aliphatic hydrocarbons containing 1 through 10 carbon atoms (methane through decanes) can be detected by this test
method at concentrations ranging from 0.0001 to 2.5000 weight %.
1.2.1 A small amount of benzene in toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene, or styrene may not be
distinguished from the non-aromatics and the concentrations are determined as a composite (see 6.1).
1.3 Monocyclic aromatic hydrocarbon impurities containing 6 through 10 carbon atoms (benzene through C aromatics) can
10
be detected by this test method at individual concentrations ranging from 0.0001 to 2.5000 weight %.
1.4 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded
off in accordance with the rounding-off method of Practice E29.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D841 Specification for Nitration Grade Toluene
D1555M Test Method for Calculation of Volume and Weight of Industrial Aromatic Hydrocarbons and Cyclohexane [Metric]
D2360 Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography
D3437 Practice for Sampling and Handling Liquid Cyclic Products
D3797 Test Method for Analysis of o-Xylene by Gas Chromatography
D4492 Test Method for Analysis of Benzene by Gas Chromatography
D4790 Terminology of Aromatic Hydrocarbons and Related Chemicals
D5060 Test Method for Determining Impurities in High-Purity Ethylbenzene by Gas Chromatography
D5135 Test Method for Analysis of Styrene by Capillary Gas Chromatography
D5136 Specification for High Purity p-Xylene
D5211 Specification for Xylenes for p-Xylene Feedstock
D5917 Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and External
Calibration
D6229 Test Method for Trace Benzene in Hydrocarbon Solvents by Capillary Gas Chromatography
D6563 Test Method for Benzene, Toluene, Xylene (BTX) Concentrates Analysis by Gas Chromatography
D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
1
This test method is under the jurisdiction ofASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility of Subcommittee
D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their Derivatives.
Current edition approved June 1, 2011. Published August 2011. Originally approved in 2009. Last previous edition approved in 2010 as D7504-10. DOI:
10.1520/D7504-11.
Current edition approved March 15, 2012. Published March 2012. Originally approved in 2009. Last previous edition approved in 2011 as D7504 - 11. DOI:
10.1520/D7504-12.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United Sta
...