Standard Historical Last Updated: Jun 24, 2013
ASTM D3760-12

Standard Test Method for Analysis of Isopropylbenzene (Cumene) by Gas Chromatography

Significance and Use

4.1 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.

4.2 This test method is useful in determining the purity of isopropylbenzene with normal impurities present including diisopropylbenzenes. 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.

4.3 Cumene hydroperoxide, if present, will yield decomposition products that will elute in the chromatogram thereby giving incorrect results.

4.4 The nonaromatic hydrocarbons commonly present from the isopropylbenzene manufacturing process will interfere with the determination of benzene when Column A in Table 1 is used.

TABLE 1 Recommended Operating Conditions

 

 Column A

 Column B

Detector

Flame Ionization

Flame Ionization

Column:

 

 

 Tubing

fused silica

fused silica

 Stationary phase

polyethylene glycol

methyl silicone

 Solid support

crosslinked

crosslinked

 Film thickness

0.25 μ

0.5 μ

 Length, m

50

50

 Diameter, mm

0.32 mm ID

0.32 mm ID

Temperatures:

 

 

  Injector, °C

275

275

  Detector, °C

300

300

  Oven:

 

 

   Initial, °C

60

35

   Time 1, min

10

10

   Final, °C

175

275

   Rate, °C/min

10

5

   Time 2, min

10

0

Carrier gas

hydrogen

helium

Flow rate, mL/min

1.0

1.0

Split ratio

100:1

100:1

Sample size, μL

1.0

1.0


4.5 The internal standard must be sufficiently resolved from any impurity and the isopropylbenzene peak.

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). This method has been found applicable for concentrations of various components up to 571 ppm.

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.

1.5 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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Details
Book of Standards Volume: 06.04
Developed by Subcommittee: D16.07
Pages: 6
DOI: 10.1520/D3760-12
ICS Code: 71.080.10