ASTM D2360 - 11

    Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography

    Active Standard ASTM D2360 | Developed by Subcommittee: D16.01

    Book of Standards Volume: 06.04


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    ASTM D2360

    Significance and Use

    The determination of hydrocarbon impurities contained in toluene and mixed xylenes used as chemical intermediates and solvents is typically required. This test is suitable for setting specifications and for use as an internal quality control tool where aromatic monocyclic hydrocarbons are produced or are used. This test method is applicable for determining the impurities from the aromatic hydrocarbon production process. Typical impurities are alkanes containing 1 to 10 carbon atoms, benzene, toluene, ethylbenzene (EB), xylenes, and aromatic hydrocarbons containing nine carbon atoms.

    Refer to Test Methods D3797, D4492, and D7504 for determining the purity of o-Xylene, p-Xylene, and benzene.

    Refer to Test Method D6563 or D7504 for determining the C8 aromatic hydrocarbon distribution in mixed xylenes.

    Purity is commonly reported by subtracting the determined expected impurities from 100.00. However, a gas chromatographic analysis cannot determine absolute purity if unknown or undetected components are contained within the material being examined.

    TABLE 1 Instrumental Parameters

    DetectorFlame ionization
    Column:
    Tubingfused silica
    Stationary phasecrosslinked polyethylene glycolA
    Film thickness, μ0.25
    Length, m60
    Diameter, mm0.32 ID
    Temperatures:
    Injector, °C270
    Detector, °C300
    Oven:
    Initial, °C60
    Time 1, min10
    Final, °C150
    Rate, °C/min5
    Time 2, min10
    Carrier gashelium
    Flow rate, mL/min1.0
    Split ratio100:1
    Sample size, μL1.0
    Analysis time, min38
    Linear velocity at 145°C, cm/s20

    A Polyethylene glycol such as Carbowax 20 M available from most chromatographic suppliers, has been found suitable for this purpose.

    1. Scope

    1.1 This test method covers the determination of the total nonaromatic hydrocarbons, and trace monocyclic aromatic hydrocarbons in the purity of toluene and mixed xylenes by gas chromatography.

    1.2 Nonaromatic aliphatic hydrocarbons containing 1 through 10 carbon atoms (methane through decanes) can be detected by this test method at concentrations ranging from 0.001 % to 2.500 weight %.

    1.2.1 A small amount of benzene in mixed xylenes may not be distinguished from the nonaromatics and the concentrations are determined as a composite.

    1.3 Monocyclic aromatic hydrocarbon impurities containing 6 through 9 carbon atoms (benzene through C9 aromatics) can be detected by this test method at individual concentrations ranging from 0.001 % to 1.000 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. For specific hazard statement, see Section 9.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D841 Specification for Nitration Grade Toluene

    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

    D5211 Specification for Xylenes for p-Xylene Feedstock

    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

    D7504 Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon Number

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E260 Practice for Packed Column Gas Chromatography

    E355 Practice for Gas Chromatography Terms and Relationships

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    E1510 Practice for Installing Fused Silica Open Tubular Capillary Columns in Gas Chromatographs


    ICS Code

    ICS Number Code 71.080.15 (Aromatic hydrocarbons)

    UNSPSC Code

    UNSPSC Code 12352005(Aromatic or heterocyclic compounds)


    DOI: 10.1520/D2360-11

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