ASTM D2638-91(2002)
(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
SCOPE
1.1 This test method is intended for 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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An American National Standard
Designation:D2638–91(Reapproved 2002)
Standard Test Method for
Real Density of Calcined Petroleum Coke by Helium
Pycnometer
This standard is issued under the fixed designation D 2638; 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 3.1.1 calcined petroleum coke—green petroleum coke
whichhasbeenthermallytreatedtodriveoffthevolatilematter
1.1 This test method is intended for the determination of the
and to develop crystalline structure.
real 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).
and/or cracked stocks.
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 D 4292 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 D 4930.
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
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
D 346 Practice for Collection and Preparation of Coke
materialbefilledbythefluidbeingdisplaced.Thisrequirement
Samples for Laboratory Analysis
ismetforthepurposesofthistestmethodbyreducingthecoke
D 2013 Practice of Preparing Coal Samples for Analysis
particles to a size smaller than 75 microns.
D 2234 Practice for Collection of a Gross Sample of Coal
3.2.4 Discussion—The density of particles larger than 75
D 4057 Practice for Manual Sampling of Petroleum and
microns up to the largest that can be put into the helium
Petroleum Products
pycnometer can also be determined, but must be designated as
D 4292 Test Method for Vibrated Bulk Density of Calcined
particle density (PD). The precision data obtained for RD may
Petroleum Coke
not be applicable to PD.
D 4930 Test Method for Dust Control Material on Calcined
Petroleum Coke
4. Summary of Test Method
E 11 Specification for Wire Cloth and Sieves for Testing
4.1 A representative sample of calcined petroleum coke is
Purposes
dried and ground to pass a 75-micron (200-mesh) screen. The
3. Terminology
mass of the sample is determined directly and the volume
derived by the volume of helium displaced when the sample is
3.1 Definitions:
introduced into a helium pycnometer. The ratio of the mass of
the sample to the volume is reported as the real density.
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.OD on Petroleum Coke.
Current edition approved Dec. 10, 2002. Published March 2003. Originally
influences the physical and chemical properties of the manu-
approved in 1991. Last previous edition approved in 1997 as D 2638 – 91(1997).
factured carbon and graphite artifacts for which it is used.
Annual Book of ASTM Standards, Vol 05.06.
Density, therefore, is a major quality specification of calcined
Annual Book of ASTM Standards, Vol 05.02.
Annual Book of ASTM Standards, Vol 14.02. petroleum coke and is used as a control in coke calcination.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D2638–91 (2002)
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 density so the oil must be removed before reducing the
sample to 75 microns. Refer to Test Method D 4930 for dedust
NOTE 2—This is a generic procedure which describes the basic steps
oil removal. involved to obtain a final result. For further specific details, the manufac-
turers’ operating instructions are to be reviewed.
7. Apparatus
11. Calculation
7.1 Analytical Balance, accurate to 6 0.1 mg.
11.1 Determine the real density of the sample in g/cm from
7.2 Desiccator.
Eq 2.
7.3 Drying Oven, preferably a vacuum oven, for tempera-
ture to 120°C. Density 5 M/V (1)
7.4 Helium Pycnometer:
...
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