ASTM D2638-06
(Test Method)Standard Test Method for Real Density of Calcined Petroleum Coke by Helium Pycnometer
Standard Test Method for Real Density of Calcined Petroleum Coke by Helium Pycnometer
SIGNIFICANCE AND USE
The real density of calcined petroleum coke directly influences the physical and chemical properties of the manufactured carbon and graphite artifacts for which it is used. Density, therefore, is a major quality specification of calcined petroleum coke and is used as a control in coke calcination.
SCOPE
1.1 This test method covers the determination of the real density (RD) of calcined petroleum coke. Real density, by definition is obtained when the particle size of the specimen is smaller than 75 microns (No. 200 Sieve).
1.2 The values stated in acceptable metric units are to be regarded as the standard.
1.3 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.
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Designation:D2638–06
Standard Test Method for
Real Density of Calcined Petroleum Coke by Helium
1
Pycnometer
This standard is issued under the fixed designation D2638; 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* 3.1.1 calcined petroleum coke, n—petroleum coke that has
been thermally treated to drive off the volatile matter and to
1.1 This test method covers the determination of the real
develop crystalline structure.
density (RD) of calcined petroleum coke. Real density, by
3.1.2 petroleum coke—a solid, carbonaceous residue pro-
definition is obtained when the particle size of the specimen is
duced by thermal decomposition of heavy petroleum fractions
smaller than 75 microns (No. 200 Sieve).
or cracked stocks, or both.
1.2 The values stated in acceptable metric units are to be
3.2 Definitions of Terms Specific to This Standard:
regarded as the standard.
3.2.1 bulk density—the mass of the particles divided by the
1.3 This standard does not purport to address all of the
volume they occupy which includes the space between the
safety concerns, if any, associated with its use. It is the
particles. Refer to Test Method D4292 for bulk density
responsibility of the user of this standard to establish appro-
procedures.
priate safety and health practices and determine the applica-
3.2.2 dedusting material—See Test Method D4930.
bility of regulatory limitations prior to use.
3.2.3 real density (RD) (also be referred to as true specific
2. Referenced Documents gravity). The mass divided by the volume occupied by the
2
material excluding pores and voids. It is required, therefore,
2.1 ASTM Standards:
that voids in the coke be eliminated and that pores in the
D346 Practice for Collection and Preparation of Coke
materialbefilledbythefluidbeingdisplaced.Thisrequirement
Samples for Laboratory Analysis
ismetforthepurposesofthistestmethodbyreducingthecoke
D2013 Practice for Preparing Coal Samples for Analysis
particles to a size smaller than 75 microns.
D2234/D2234M Practice for Collection of a Gross Sample
3.2.3.1 Discussion—The density of particles larger than 75
of Coal
microns up to the largest that can be put into the helium
D4057 Practice for Manual Sampling of Petroleum and
pycnometer can also be determined, but must be designated as
Petroleum Products
particle density (PD). The precision data obtained for RD may
D4292 Test Method for Determination of Vibrated Bulk
not be applicable to PD.
Density of Calcined Petroleum Coke
D4930 Test Method for Dust Control Material on Calcined
4. Summary of Test Method
Petroleum Coke
4.1 A representative sample of calcined petroleum coke is
E11 SpecificationforWovenWireTestSieveClothandTest
dried and ground to pass a 75-micron (200-mesh) screen. The
Sieves
mass of the sample is determined directly and the volume
3. Terminology derived by the volume of helium displaced when the sample is
introduced into a helium pycnometer. The ratio of the mass of
3.1 Definitions:
the sample to the volume is reported as the real density.
1
This test method is under the jurisdiction of ASTM Committee D02 on 5. Significance and Use
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
5.1 The real density of calcined petroleum coke directly
D02.05 on Properties of Fuels, Petroleum Coke and Carbon Material.
influences the physical and chemical properties of the manu-
Current edition approved July 1, 2006. Published July 2006. Originally approved
in 1991. Last previous edition approved in 2002 as D2638–91(2002). DOI:
factured carbon and graphite artifacts for which it is used.
10.1520/D2638-06.
Density, therefore, is a major quality specification of calcined
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
petroleum coke and is used as a control in coke calcination.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D2638–06
6. Interferences absolute pressures in each chamber prior to connection and the
final pressure after the chambers have been connected.
6.1 Oil or other dedust material sprayed on calcined petro-
10.5 Record the final sample volume or density when the
leum coke to control dust will interfere with the determination
pycnometer has reached equilibrium.
of real densit
...
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