ASTM D7662-11

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Designation: D7662 − 11
StandardTest Method for
1
Carbon Content in Carbon Black Feedstock Oils
This standard is issued under the fixed designation D7662; 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 boat in a tube furnace at 1350°C in an air- or oxygen-enriched
atmosphere resulting in complete combustion. Carbon in the
1.1 This test method covers the instrumental determination
sample is completely oxidized to carbon dioxide. Moisture and
of carbon content in samples of carbon black feedstock oils.
particulates are removed from the gas stream by traps filled
Values obtained represent the total carbon content.
with anhydrous magnesium perchlorate.The gas stream is then
1.2 This test method is applicable to carbon black feedstock
passed through a cell in which carbon dioxide concentration is
oils derived from petroleum, coal, and other sources which
measured by an infrared (IR) absorption detector at a precise
include fuel oils, residues, tars, pitches, reclaimed oils, and
wavelength in the IR spectrum.
similar materials that are normally handled as liquids. This test
3.2 This test method is for use with commercially available
method is applicable to products that typically contain 75 to 94
carbon analyzers equipped to carry out the combustion and
mass % carbon.
measurement operations automatically.
1.3 The results of these tests can be expressed as mass %
3.3 The carbon analyzer shall be calibrated using an appro-
carbon.
priate calibration standard (see 6.5).
1.4 Units—The values stated in SI units are to be regarded
3.4 The instrument may be configured to analyze more than
as standard. No other units of measurement are included in this
one element such as a carbon-sulfur analyzer. In this case, the
standard.
analyzer has individual detectors for each element that are
1.5 This standard does not purport to address all of the
arranged in series.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Significance and Use
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 4.1 Measuring the total carbon content of feedstock oil is
often a necessary component in calculations for carbon dioxide
2. Referenced Documents
emissions, estimating yield of a process, or assessing product
2
2.1 ASTM Standards: quality.
D4057 Practice for Manual Sampling of Petroleum and
4.2 The carbon black industry measures carbon content of
Petroleum Products
feedstock oils along with carbon content of carbon black
D4177 Practice for Automatic Sampling of Petroleum and
products per Test Method D7633 for Carbon Black-Carbon
Petroleum Products
Content in calculations to determine carbon dioxide emissions
D7633 Test Method for Carbon Black—Carbon Content
for compliance with governmental greenhouse-gas-reporting
requirements.
3. Summary of Test Method
3.1 In this test method, a sample of feedstock oil is weighed
5. Apparatus
in a combustion boat containing a tungsten oxide based
5.1 Thereareanumberofcommercialinstrumentsavailable
accelerator and the carbon content is determined by placing the
that are designed to measure carbon content in organic mate-
rials including carbon and carbon-sulfur analyzers. This test
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This test method is under the jurisdiction ofASTM Committee D24 on Carbon
method makes no specifications regarding system designs.
Black and is the direct responsibility of Subcommittee D24.66 on Environment,
Health, and Safety.
5.2 Functionally,however,thefollowingarespecifiedforall
Current edition approved Jan. 1, 2011. Published February 2011. Originally
instruments:
approved in 2010. Last previous edition approved in 2010 as D7662 – 10. DOI:
10.1520/D7662-11.
5.2.1 An analytical balance, or equivalent, that is capable of
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
a weighing sensitivity of 0.1 mg or better resolution.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.2.2 The combustion tube and boat are made of a suitable
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. material such as mullite, porcelain, or zircon.
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D7662 − 11
5.2.3 The sample is absorbed onto tungsten oxide based 9. Calibration
accelerator to control the sample combustion rate.
9.1 Calibrate the instrument per the manufacturer’s recom-
5.2
...