Standard test method for calculation of carbon distribution and structural group analysis of petroleum oils by the n-d-M method
This method covers the calculation of the carbon distribution and ring content of olefin-free petroleum oils from measurements of refractive index, density and molecular weight (n-d-M). This method should not be applied to oils whose compositions are outside the following ranges: 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; 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. The refractive index and density of the oil are determined at 20/sup 0/C. The molecular weight is determined experimentally or estimated from measurements of viscosity at 100 and 210/sup 0/F (37.8 and 100/sup 0/C). These data are then used to calculate the carbon distribution (aromatic ring structure %C/sub A/ naphthene ring structure %C/sub N/, and paraffin chains %C/sub p/) or the ring analysis (R/sub A/, R/sub N/) using the appropriate set of equations.
- OSTI ID:
- 6554115
- Journal Information:
- Annu. Book ASTM Stand.; (United States), Vol. 25; Other Information: ANSI/ASTM-D--3238-80
- Country of Publication:
- United States
- Language:
- English
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Standard test method for calculation of carbon distribution and structural group analysis of petroleum oils by the n-d-M method