ASTM D2416-84(1999)

Standard Test Method for Coking Value of Tar and Pitch (Modified Conradson)

SCOPE
1.1 This test method covers the determination of the coking value of tar and pitch having an ash content not over 0.5% as determined by Test Method D2415.  
1.2 Coking values by this method are practically the same as those obtained by Test Method D189, but results are more reproducible. The apparatus used is identical, except that an electric furnace is substituted for the gas flame.  
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.

General Information

• Status: Historical
• Publication Date: 09-Dec-1999
• ICS: 91.100.50 - Binders. Sealing materials
• 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 D2416-84(2004) - Standard Test Method for Coking Value of Tar and Pitch (Modified Conradson)
• Effective Date: 01-Nov-2004
• Referred By: ASTM D4715-98(2022)e1 - Standard Test Method for Coking Value of Tar and Pitch (Alcan)
• Effective Date: 10-Dec-1999

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
An American National Standard
Designation: D 2416 – 84 (Reapproved 1999)
Standard Test Method for
Coking Value of Tar and Pitch (Modified Conradson)
This standard is issued under the fixed designation D 2416; 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 ing tars and pitches. The method can also be used as one
element in establishing the uniformity of shipments or sources
1.1 This test method covers the determination of the coking
of supply.
value of tar and pitch having an ash content not over 0.5 % as
determined by Test Method D 2415.
5. Apparatus (see Fig. 1)
1.2 Cokingvaluesbythismethodarepracticallythesameas
5.1 Crucible—Wide-form, a, either porcelain, glazed
those obtained by Test Method D 189, but results are more
throughout, or silica, a; 29 to 31-mL capacity, 46 to 49 mm in
reproducible. The apparatus used is identical, except that an
rim diameter.
electric furnace is substituted for the gas flame.
5.2 Skidmore Crucible—Iron crucible, b, flanged and
1.3 This standard does not purport to address all of the
ringed, 65 to 82-mLcapacity, 53 to 57 mm inside and 60 to 67
safety concerns, if any, associated with its use. It is the
mmoutsidediameterofflange,37to39mminheight,supplied
responsibility of the user of this standard to establish appro-
with a cover without delivery tubes and having the vertical
priate safety and health practices and determine the applica-
opening closed. The horizontal opening of about 6.5 mm shall
bility of regulatory limitations prior to use.
be kept clean. The outside diameter of the flat bottom shall be
2. Referenced Documents 30 to 32 mm.
5.3 Metal Crucible— Spun sheet-iron or nickel crucible, c,
2.1 ASTM Standards:
with cover; 78 to 82 mm in outside diameter at the top, 58 to
D 140 Practice for Sampling Bituminous Materials
60 mm in height, and approximately 0.8 mm in thickness. At
D 189 Test Method for Conradson Carbon Residue of
the bottom of this crucible, and level before each test, shall be
Petroleum Products
a layer of about 25 mL of sand, or enough to bring the
D 370 Test Method for Dehydration of Oil-Type Preserva-
Skidmore crucible, with cover on, nearly to the top of the
tives
3 sheet-iron crucible. The sand shall be dry and screened to pass
D 2415 Test Method for Ash in Coal Tars and Pitch
through a 65-mesh screen and to be retained on a 200-mesh
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
5 screen.
poses
5.4 Wire Support— Triangle (65 mm) of bare Nichrome
3. Summary of Test Method wire 1.5 to 2.0 mm in cross section, having an opening small
enough to support the bottom of the metal crucible (see 5.3).
3.1 A sample of the tar or pitch is vaporized and pyrolized
The triangle, d, shall have its arms bent to form a cradle that
for a specified time at a specified temperature in special
will support the metal crucible with its bottom level with the
standardized equipment that limits the available oxygen sup-
bottom of the insulator (see 5.6).
ply. The percentage of residue is reported as the coking value.
5.5 Hood—Circular, sheet-iron, e, from 120 to 130 mm in
4. Significance and Use
diameter, the height of the lower perpendicular side to be from
50 to 53 mm; provided at the top with a chimney 50 to 60 mm
4.1 This test method is useful for indicating the relative
in height and 50 to 56 mm in inside diameter, which is attached
coke-forming propensities and for evaluating and characteriz-
to the lower part having the perpendicular sides by a cone-
shaped member, bringing the total height of the complete hood
This test method is under the jurisdiction of ASTM Committee D-2 on
to 125 to 130 mm. The hood may be made from a single piece
Petroleum Products and Lubricantsand is the direct responsibility of Subcommittee
of metal, providing it conforms to foregoing dimensions. A
D02.05.OFon Industrial Pitches.
bridge, g, made of approximately 3 mm iron or nichrome wire,
Current edition approved Sept. 28, 1984. Published November 1984. Originally
published as D2416 – 65 T. Last previous edition D2416 – 73 (1979). and having a height of 50 mm above the top of the chimney,
Annual Book of ASTM Standards, Vol 04.03.
shall be attached to handle the chimney when positioning.
Annual Book of ASTM Standards, Vol 05.01.
Annual Book of ASTM Standards, Vol 04.10.
Annual Book of ASTM Standards, Vol 14.02.
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D 2416
open container until the surface is free from foam. Take care
not to overheat, and remove heat source immediately when
foam subsides.
7.3 Tar—Dehydrate a representative portion of the bulk
sample in accordance with Test Method D 370, but stop the
distillation when the temperature reaches 170°C. Separate any
oilfromthewaterthathasdistilledover(ifcrystalsarepresent,
warm sufficiently to ensure their solution), and thoroughly mix
the oil with the residual tar in the still after the latter has cooled
to a moderate temperature.
8. Preparation of Working Sample
8.1 Hard Pitch—If the pitch can be crushed at room
temperature, prepare a 20-g working sample by suitable
crushing, mixing, and quartering of a representative portion of
the dry sample. The crushing can be done with a small jaw
crusher and a mortar and pestle. No particle in the representa-
tive sample should be larger than 5 mm in any dimension.
CrushthissamplesothatallofitwillpasstheNo.30(600-µm)
sieve but have a minimum of fine particles.
8.2 Soft Pitch—If the pitch is too soft to grind and to sticky
FIG. 1 Apparatus for Determining Carbon Residue
to mix, heat a representative portion of the dry sample to the
lowest temperature that will permit passage through the No. 30
5.6 Insulator—Ceram
...