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ASTM D 3238 Document Information:
Title
Standard Test Method for Calculation of Carbon Distribution and Structural Group Analysis of Petroleum Oils by the n-d-M Method
ASTM International
Publication Date:
Aug 15, 1995
Scope:
This test method covers the calculation of the carbon distribution and
ring content (Note 1) of
olefin-free petroleum oils from measurements of refractive index,
density, and molecular weight
(n-d-M).(Footnote 2) This test method should not be applied to oils
whose compositions are outside
the following ranges:
In terms of carbon distribution - up to 75 % carbon atoms in ring
structure; percentage in aromatic
rings not larger than 1.5 times the percentage in naphthenic rings.
In terms of ring content - up to four rings per molecule with not more
than half of them aromatic.
A correction must be applied for oils containing significant
quantities of sulfur.
NOTE 1 - The composition of complex petroleum fractions is often
expressed in terms of the
proportions of aromatic rings (R(A)), naphthene rings (R(N)), and
paraffin chains (C(P)) that would
comprise a hypothetical mean molecule. Alternatively, the composition
may be expressed in terms of
a carbon distribution, that is, the percentage of the total number of
carbon atoms that are present
in aromatic ring structures (% C(A)), naphthene ring structures (%
C(N)), and paraffin chains (%
C(p)).
The values stated in SI units are to be regarded as the standard. The
values 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 and
health practices and determine the applicability of regulatory
limitations prior to use.
Footnote 2 - Van Nes, K., and van Westen, H. A., Aspects of the
Constitution of Mineral Oils,
Elsevier, New York, 1951.
Keywords:
- carbon distribution
- density
- molecular weight
- petroleum oils
- refractive index
- ring content
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