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ASTM D 4530 Document Information:
Title
Standard Test Method for Determination of Carbon Residue (Micro Method)
ASTM International
Publication Date:
Nov 1, 2007
Scope:
This test method covers the determination of the amount of
carbon residue (see Note 1) formed after evaporation and pyrolysis
of petroleum materials under certain conditions and is intended to
provide some indication of the relative coke forming tendency of
such materials.
The test results are equivalent to the Conradson Carbon Residue
test (see Test Method D 189).
NOTE 1—This procedure is a modification of the original method
and apparatus for carbon residue of petroleum materials, where it
has been demonstrated that thermogravimetry is another applicable
technique.2 However, it is the responsibility of the
operator to establish operating conditions to obtain equivalent
results when using thermogravimetry.
This test method is applicable to petroleum products that
partially decompose on distillation at atmospheric pressure and was
tested for carbon residue values of 0.10 to 30 % (m/m). Samples
expected to be below 0.10 weight % (m/m) residue should be
distilled to remove 90 % (V/V) of the flask charge (see Section 9).
The 10 % bottoms remaining is then tested for carbon residue by
this test method.
Ash-forming constituents, as defined by Test Method D 482, or
non-volatile additives present in the sample will add to the carbon
residue value and be included as part of the total carbon residue
value reported.
Also in diesel fuel, the presence of alkyl nitrates, such as
amyl nitrate, hexyl nitrate, or octyl nitrate, causes a higher
carbon residue value than observed in untreated fuel, which may
lead to erroneous conclusions as to the coke-forming propensity of
the fuel. The presence of alkyl nitrate in the fuel may be detected
by Test Method D 4046.
The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.
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
practices and to determine the applicability of regulatory
limitations prior to use. For specific warning statements, see
8.2.3 and 8.4.
*A Summary of Changes section appears at the end of this
standard.
2 See Fuel, Vol 63, July 1984, pp.
931–934.
Keywords:
- carbon residue
- carbon residue (micro method)
- diesel fuel
- lubricating oil
- petroleum products
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