ASTM D2638-91(1997)

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 problems, 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.

General Information

• Status: Historical
• Publication Date: 31-Dec-1996
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.05 - Properties of Fuels, Petroleum Coke and Carbon Material

Relations

• Replaced By: ASTM D2638-91(2002) - Standard Test Method for Real Density of Calcined Petroleum Coke by Helium Pycnometer
• Effective Date: 10-Dec-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact
ASTM International (www.astm.org) for the latest information.
Designation: D 2638 – 91 (Reapproved 1997)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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 3.2 Definitions of Terms Specific to This Standard:
3.2.1 bulk density—the mass of the particles divided by the
1.1 This test method is intended for the determination of the
volume they occupy which includes the space between the
real density (RD) of calcined petroleum coke. Real density, by
particles. Refer to Test Method D 4292 for bulk density
definition is obtained when the particle size of the specimen is
procedures.
smaller than 75 microns (No. 200 Sieve).
3.2.2 dedusting material—See Test Method D 4930.
1.2 The values stated in acceptable metric units are to be
3.2.3 real density (RD) (also be referred to as true specific
regarded as the standard.
gravity). The mass divided by the volume occupied by the
1.3 This standard does not purport to address all of the
material excluding pores and voids. It is required, therefore,
safety concerns, if any, associated with its use. It is the
that voids in the coke be eliminated and that pores in the
responsibility of the user of this standard to establish appro-
material be filled by the fluid being displaced. This requirement
priate safety and health practices and determine the applica-
is met for the purposes of this test method by reducing the coke
bility of regulatory limitations prior to use.
particles to a size smaller than 75 microns.
2. Referenced Documents
3.2.3.1 Discussion—The density of particles larger than 75
2.1 ASTM Standards: microns up to the largest that can be put into the helium
pycnometer can also be determined, but must be designated as
D 346 Practice for Collection and Preparation of Coke
Samples for Laboratory Analysis particle density (PD). The precision data obtained for RD may
not be applicable to PD.
D 2013 Method of Preparing Coal Samples for Analysis
D 2234 Test Methods for Collection of a Gross Sample of
4. Summary of Test Method
Coal
4.1 A representative sample of calcined petroleum coke is
D 4057 Practice for Manual Sampling of Petroleum and
dried and ground to pass a 75-micron (200-mesh) screen. The
Petroleum Products
mass of the sample is determined directly and the volume
D 4292 Test Method for Vibrated Bulk Density of Calcined
derived by the volume of helium displaced when the sample is
Petroleum Coke
introduced into a helium pycnometer. The ratio of the mass of
D 4930 Test Method for Dust Control Material on Calcined
the sample to the volume is reported as the real density.
Petroleum Coke
E 11 Specification for Wire-Cloth Sieve for Testing Pur- 5. Significance and Use
poses
5.1 The real density of calcined petroleum coke directly
influences the physical and chemical properties of the manu-
3. Terminology
factured carbon and graphite artifacts for which it is used.
3.1 Definitions:
Density, therefore, is a major quality specification of calcined
3.1.1 calcined petroleum coke—green petroleum coke
petroleum coke and is used as a control in coke calcination.
which has been thermally treated to drive off the volatile matter
6. Interferences
and to develop crystalline structure.
3.1.2 petroleum coke—a solid, carbonaceous residue pro-
6.1 Oil or other dedust material sprayed on calcined petro-
duced by thermal decomposition of heavy petroleum fractions
leum coke to control dust will interfere with the determination
and/or cracked stocks.
of real density so the oil must be removed before reducing the
sample to 75 microns. Refer to Test Method D 4930 for dedust
oil removal.
This test method is under the jurisdiction of ASTM Committee D-2 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
7. Apparatus
D02.05.OD on Petroleum Coke Sampling and Procedures.
Current edition approved July 15, 1991. Published October 1991.
7.1 Analytical Balance, accurate to 6 0.1 mg.
Annual Book of ASTM Standards, Vol 05.05.
7.2 Desiccator.
Annual Book of ASTM Standards, Vol 05.02.
7.3 Drying Oven, preferably a vacuum oven, for tempera-
Annual Book of ASTM Standards, Vol 05.03.
Annual Book of ASTM Standards, Vol 14.02. ture to 120°C.
NOTICE:¬This¬standard¬has¬either¬been¬superceded¬and¬replaced¬by¬a¬new¬version¬or¬discontinued.¬
Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.¬
D 2638
manufacturers’ operating instructions are to be reviewed.
7.4 Helium Pycnometer:
7.5 Jaw Crusher and Roll Crusher—Other style crushers
11. Calculation
which allow control over particle size without contamination
11.1 Determine the real density of the sample in g/cm from
are acceptable.
Eq 2.
7.6 Rifflers, with hoppers and closures.
7.7 Wire Sieve, 75 microns (No. 200 mesh), meeting
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