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ASTM D3238-22a

Current Revision

Standard Test Method for Calculation of Carbon Distribution and Structural Group Analysis of Petroleum Oils by the n-d-M Method

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1.1 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).2 This test method should not be applied to oils whose compositions are outside the following ranges:

1.1.1 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.

1.1.2 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 (RA), naphthene rings (RN), and paraffin chains (CP) 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 (% CA), naphthene ring structures (% CN), and paraffin chains (% Cp).

1.2 The values stated in SI units are to be regarded as the standard.

1.2.1 Exception—The values in parentheses are for information only.

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 The carbon distribution and ring content serve to express the gross composition of the heavier fractions of petroleum. These data can be used as an adjunct to the bulk properties in monitoring the manufacture of lubricating oil base stocks by distillation, solvent refining or hydrogenation, or both, and in comparing the composition of stocks from different crude sources. Furthermore, the data can often be correlated with critical product performance properties.

SDO ASTM: ASTM International
Document Number D3238
Publication Date Nov. 1, 2022
Language en - English
Page Count 3
Revision Level 22a
Supercedes
Committee D02.04.0K
Publish Date Document Id Type View
Nov. 1, 2022 D3238-22A Revision
Oct. 1, 2022 D3238-22 Revision
Dec. 1, 2017 D3238-17A Revision
June 1, 2017 D3238-17 Revision
April 10, 2000 D3238-95R00E01 Revision
Oct. 1, 2015 D3238-95R15 Reaffirmation
Oct. 1, 2010 D3238-95R10 Reaffirmation
Nov. 1, 2005 D3238-95R05 Reaffirmation
April 10, 2000 D3238-95R00 Reaffirmation