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ASTM D3238-22a
Standard Test Method for Calculation of Carbon Distribution and Structural Group Analysis of Petroleum Oils by the n-d-M Method (Includes all amendments and changes 12/13/2022).
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STANDARD published on 1.11.2022
The information about the standard:
Designation standards: ASTM D3238-22a
Publication date standards: 1.11.2022
SKU: NS-1097001
The number of pages: 3
Approximate weight : 9 g (0.02 lbs)
Country: American technical standard
Category: Technical standards ASTM
The category - similar standards:
Annotation of standard text ASTM D3238-22a :
Keywords:
carbon distribution, density, molecular weight, petroleum oils, refractive index, ring content,, ICS Number Code 75.080 (Petroleum products in general)
Additional information
| Significance and Use | ||||||||||||||
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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. |
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| 1. Scope | ||||||||||||||
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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 distributionup 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 contentup 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
(1.2?The
values stated in SI units are to be regarded as the standard.
1.2.1?ExceptionThe 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. |
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| 2. Referenced Documents | ||||||||||||||
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