ASTM D3760-02
(Test Method)Standard Test Method for Analysis of Isopropylbenzene (Cumene) by Gas Chromatography
Standard Test Method for Analysis of Isopropylbenzene (Cumene) by Gas Chromatography
SCOPE
1.1 This test method covers the determination of the purity of isopropylbenzene (cumene) by gas chromatography.
1.2 This test method has been found applicable to the measurement of impurities such as nonaromatic hydrocarbons, benzene, ethylbenzene, t-butylbenzene, n-propylbenzene, alpha-methylstyrene, sec-butylbenzene, and diisopropylbenzene, which are common to the manufacturing process of isopropylbenzene. Limit of detection for these impurities is 10 mg/kg (see 5.1).
1.3 The following applies to all specified limits in this standard: for purposes of determining conformance with this standard, an observed value or a calculated value shall be rounded off "to the nearest unit" in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E 29.
1.4 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 statements, see Section 7.
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Designation: D 3760 – 02
Standard Test Method for
Analysis of Isopropylbenzene (Cumene) by Gas
1
Chromatography
This standard is issued under the fixed designation D 3760; 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 2.2 Other Document:
OSHA Regulations, 29CFR, paragraphs 1910.1000 and
1.1 This test method covers the determination of the purity
5
1910.1200
of isopropylbenzene (cumene) by gas chromatography.
1.2 This test method has been found applicable to the
3. Summary of Test Method
measurement of impurities such as nonaromatic hydrocarbons,
3.1 A known amount of internal standard is added to a
benzene, ethylbenzene, t-butylbenzene, n-propylbenzene,
sample of isopropylbenzene. The prepared sample is mixed
alpha-methylstyrene, sec-butylbenzene, and diisopropylben-
and analyzed by a gas chromatograph equipped with a flame
zene, which are common to the manufacturing process of
ionization detector (FID). The peak area of each impurity and
isopropylbenzene. Limit of detection for these impurities is 10
the internal standard is measured and the amount of each
mg/kg (see 5.1).
impurity is calculated from the ratio of the peak area of the
1.3 The following applies to all specified limits in this
internal standard versus the peak area of the impurity. Purity by
standard: for purposes of determining conformance with this
GC (the isopropylbenzene content) is calculated by subtracting
standard, an observed value or a calculated value shall be
the sum of the impurities found from 100.00. Results are
rounded off “to the nearest unit” in the last right-hand digit
reported in weight percent.
used in expressing the specification limit, in accordance with
the rounding-off method of Practice E 29.
4. Significance and Use
1.4 This standard does not purport to address all of the
4.1 This test method is suitable for setting specifications on
safety concerns, if any, associated with its use. It is the
the materials referenced in 1.2 and for use as an internal quality
responsibility of the user of this standard to establish appro-
control tool where isopropylbenzene is produced or is used in
priate safety and health practices and determine the applica-
a manufacturing process. It may also be used in development
bility of regulatory limitations prior to use. For specific hazard
or research work involving isopropylbenzene.
statements, see Section 7.
4.2 This test method is useful in determining the purity of
2. Referenced Documents isopropylbenzene with normal impurities present including
diisopropylbenzenes. If extremely high boiling or unusual
2.1 ASTM Standards:
impurities are present in the isopropylbenzene, this test method
D 3437 Practice for Sampling and Handling Liquid Cyclic
2 would not necessarily detect them and the purity calculation
Products
would be erroneous.
E 29 Practice for Using Significant Digits in Test Data to
3 4.3 Cumene hydroperoxide, if present, will yield decompo-
Determine Conformance with Specifications
4 sition products that will elute in the chromatogram thereby
E 260 Practice for Packed Gas Chromatography
giving incorrect results.
E 355 Practice for Gas Chromatography Terms and Rela-
4
4.4 The nonaromatic hydrocarbons commonly present from
tionships
the isopropylbenzene manufacturing process will interfere with
the determination of benzene when Column A in Table 1 is
1
This test method is under the jurisdiction of ASTM Committee D16 on used.
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
4.5 The internal standard must be sufficiently resolved from
Subcommittee D16.07 on Styrene, Ethylbenzene, and C and C Aromatic Hydro-
9 10
any impurity and the isopropylbenzene peak.
carbons.
Current edition approved Jan. 10, 2002. Published March 2002. Originally
published as D 3760 – 79. Last previous edition D 3760 – 98.
2
Annual Book of ASTM Standards, Vol 06.04.
3 5
Annual Book of ASTM Standards, Vol 14.02. Available from Superintendent of Documents, U.S. Government Printing
4
Annual Book of ASTM Standards, Vol 03.06. Office, Washington, DC 20402.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D3760–02
TABLE 1 Instrumental Parameters
7. Hazards
Column A Column B
7.1 Consult current OSHA regulations and suppliers’ Mate-
Detector Flame Ionization Flame Ionization
rial Safety Data Sheets on handling materials listed in this test
Column:
method.
Tubing fused silica fused silica
Stationary phase polyethylene glycol methyl silicone
8. Samplin
...
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