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ASTM D2306-00

(Test Method)

Standard Test Method for C8 Aromatic Hydrocarbon Analysis by Gas Chromatography (Withdrawn 2006)

Standard Test Method for C<sub>8</sub> Aromatic Hydrocarbon Analysis by Gas Chromatography (Withdrawn 2006)

SCOPE
1.1 This test method determines the relative distribution of the individual C8 aromatic hydrocarbon isomers in the following xylene products:
1.1.1 Nitration grade xylene conforming to Specification D843.
1.1.2 Xylenes for p-Xylene feedstock conforming to Specification D5211.
1.1.3 Ten-degree xylene conforming to Specification D846.
1.2 The absolute concentration of hydrocarbon impurities typically found in commercially available mixed C8 aromatic hydrocarbons should be determined using Test Method D2360.
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. For specific hazard statements, see Section 8.
WITHDRAWN RATIONALE
This test method determines the relative distribution of the individual C8 aromatic hydrocarbon isomers in the following xylene products: nitration grade xylene conforming to Specification D 843, xylenes for p-xylene feedstock conforming to Specification D 5211, and ten-degree xylene conforming to Specification D 846.
Formerly under the jurisdiction of Committee D16 on Aromatic Hydrocarbons and Related Chemicals, this test method was withdrawn in January 2006. This standard is being withdrawn without replacement due to its limited use by industry.

General Information

Status
Withdrawn
Publication Date
09-Jun-2000
Withdrawal Date
11-Jan-2006
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
Current Stage
Ref Project

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ASTM D2306-00 - Standard Test Method for C<sub>8</sub> Aromatic Hydrocarbon Analysis by Gas Chromatography (Withdrawn 2006)ASTM D2306-00 - Standard Test Method for C<sub>8</sub> Aromatic Hydrocarbon Analysis by Gas Chromatography (Withdrawn 2006)
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ASTM D2306-00 - Standard Test Method for C<sub>8</sub> Aromatic Hydrocarbon Analysis by Gas Chromatography (Withdrawn 2006)
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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:D2306–00
Standard Test Method for
C Aromatic Hydrocarbon Analysis by Gas
Chromatography
This standard is issued under the fixed designation D 2306; 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.
1. Scope D 3797 Test Method for Analysis of o-Xylene by Gas
Chromatography
1.1 This test method determines the relative distribution of
D 3798 Test Method for Analysis of p-Xylene by Gas
the individual C aromatic hydrocarbon isomers in the follow-
Chromatography
ing xylene products:
D 4626 Practice for Calculation of Gas Chromatographic
1.1.1 Nitration grade xylene conforming to Specification
Response Factors
D 843.
D 4790 Terminology of Aromatic Hydrocarbons and Re-
1.1.2 Xylenes for p-Xylene feedstock conforming to Speci-
lated Chemicals
fication D 5211.
D 5060 Test Method for Determining Impurities in High-
1.1.3 Ten-degree xylene conforming to Specification D 846.
Purity Ethylbenzene by Gas Chromatography
1.2 The absolute concentration of hydrocarbon impurities
D 5211 Specification for Xylenes for p-Xylene Feedstock
typically found in commercially available mixed C aromatic
E29 Practice for Using Significant Digits in Test Data to
hydrocarbons should be determined using Test Method
Determine Conformance with Specifications
D 2360.
E 260 Practice for Packed Column Gas Chromatography
1.3 The following applies to all specified limits in this test
E 355 Practice for Gas Chromatography Terms and Rela-
method: for purposes of determining conformance with this
tionships
test method, an observed value or a calculated value shall be
E 691 Practice for Conducting an Interlaboratory Test Pro-
rounded off “to the nearest unit” in the last right-hand digit
gram to Determine the Precision of Test Methods
used in expressing the specification limit, in accordance with
2.2 Other Document:
the rounding-off method of ASTM PracticeE29.
OSHA Regulations,29 CFR, paragraphs 1910.1000 and
1.4 This standard does not purport to address all of the
1910.1200
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3. Terminology
priate safety and health practices and determine the applica-
3.1 Definitions:
bility of regulatory limitations prior to use. For specific hazard
3.1.1 For definition of terms used in this test method see
statements, see Section 9.
Terminology D 4790.
2. Referenced Documents
4. Summary of Test Method
2.1 ASTM Standards:
2 4.1 The specimen is introduced into a gas chromatograph
D 843 Specification for Nitration Grade Xylene
3 equipped with either a flame ionization detector (FID) or
D 846 Specification for Ten-Degree Xylene
thermal conductivity detector (TCD). Either packed or capil-
D 2360 Test Method for Trace Impurities in Monocyclic
lary columns are permitted. The peak area of each component
Aromatic Hydrocarbons by Gas Chromatography
is measured and the weight percent concentration is calculated
D 3437 Practice for Sampling and Handling Liquid Cyclic
by dividing the peak area of the individual component by the
Products
sum of the total individual peak areas. The result is multiplied
by 100 to get the normalized C aromatic hydrocarbon isomer
This test method is under the jurisdiction of ASTM Committee D16 on
distribution.
Aromatic 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 10, 2000. Published August 2000. Originally Annual Book of ASTM Standards, Vol 05.02.
published as D 2306 – 64. Last previous edition D 2306 – 96. Annual Book of ASTM Standards, Vol 14.02.
2 6
Annual Book of ASTM Standards, Vol 06.04. Available from the Superintendent of Documents, U.S. Government Printing
Discontinued 1991. See 1990 Annual Book of ASTM Standards, Vol 06.03. Office, Washington, DC 20402.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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.
D2306–00
5. Significance and Use 11. Preparation of Apparatus
5.1 This test method is suitable for setting specifications on
11.1 The method used to prepare packed columns is not
the materials referenced in 1.1.1 through 1.1.3. This test
critical provided that the finished column produces the desired
method may also be used as an internal quality control tool and
separation.
in development or research work.
11.2 Follow manufacturer’s instructions for mounting and
5.1.1 Refer to Methods D 5060, D 3797, and D 3798 to
conditioning the column into the chromatograph and adjusting
determine the purity of ethylbenzene, o-xylene, and p-xylene
the instrument to the conditions described in Table 1. Allow
respectively.
sufficient time for the equipment to reach equilibrium. See
5.2 This test method does not attempt to determine the
Practices E 260 and E 355 for additional information on gas
absolute purity of the sample, but defines the relative distribu-
chromatography practices and terminology.
tion of the C aromatic hydrocarbons.
11.3 The column must be capable of resolving the C
6. Interferences aromatic hydrocarbons as individual isomers.
11.3.1 The resolution of two components is defined as
6.1 If present, nonaromatic hydrocarbons of twelve carbons
follows:
or greater will be interferences in this analysis.
2~t 2 t !
R,m R ,p
7. Apparatus
R 5 (1)
w 1 w !
~
b,m b,p
7.1 Gas Chromatograph—Any instrument having a flame
where:
ionization detector or a thermal conductivity detector may be
t => t
R,m R,p
used. A flame ionization detector is preferred.
R = peak resolution,
7.2 Columns—Both capillary and packed columns contain-
t = retention time of m-xylene, (m = m-xylene),
R,m
ing a stationary phase of cross-linked polyethylene glycol have
t = retention time of p-xylene, (p = p-xylene),
R, p
been found satisfactory. The column and instrumental condi-
w = peak width at baseline for m-xylene,
...

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5.1 This test method is suitable for setting specifications on the materials referenced in 1.2 and for use as an internal quality control tool where isopropylbenzene is produced or is used in a manufacturing process. It may also be used in development or research work involving isopropylbenzene.  
5.2 This test method is useful in determining the purity of isopropylbenzene with normal impurities present. If extremely high boiling or unusual impurities are present in the isopropylbenzene, this test method would not necessarily detect them and the purity calculation would be erroneous.  
5.3 Cumene hydroperoxide, if present, will yield thermal decomposition products, primarily AP and DMPC as stated in 4.1, that will elute in the chromatogram thereby giving incorrect results unless they are excluded as indicated in 4.1. It is also possible to get erroneous results for trace alpha-methylstyrene present in isopropylbenzene if the inlet has become unduly contaminated with non-volatile foreign substances.  
5.4 The nonaromatic hydrocarbons commonly present from the isopropylbenzene manufacturing process, particularly a non-zeolitic one, will interfere with the determination of xylenes (if present).
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1.1 This test method covers the determination of the purity of isopropylbenzene (cumene) by gas chromatography. Calibration of the gas chromatography system is done by the external standard calibration technique.  
1.2 This test method has been found applicable to the measurement of impurities such as nonaromatic hydrocarbons, benzene, toluene, ethylbenzene, phenol, cymenes, t-butylbenzene, n-butylbenzene, n-propylbenzene, alpha-methylstyrene, sec-butylbenzene, and diisopropylbenzenes, which are impurities that can be found in isopropylbenzene. The latter impurities can be analyzed over a range of 1 mg/kg to 500 mg/kg by this method (see Table 1). The limit of quantitation averages 3.8 mg/kg while the limit of detection for these impurities averages 1.1 mg/kg based on the data in Table 1.  
1.3 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.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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