USD 71.6797

0

EUR 87.3274

0

BRENT 72.59

0

AI-92 45.65

0

AI-95 49.47

0

AI-98 55.42

+0.01

Diesel 49.74

-0.01

755

SARA analysis

Analysis of the composition of crude oils can be complex, but the simple analysis scheme is to divide an oil into its saturate, aromatic, resin, and asphaltene (SARA ) fractions.

SARA analysis

A method for characterization of heavy oils based on fractionation, whereby a heavy oil sample is separated into smaller quantities or fractions, with each fraction having a different composition.

Fractionation is based on the solubility of hydrocarbon components in various solvents used in this test. Each fraction consists of a solubility class containing a range of different molecular-weight species.

In this method, the crude oil is fractionated to 4 solubility classes, referred to collectively as SARA: saturates, aromatics, resins, and asphaltenes.

Saturates are generally iso- and cyclo-paraffins, while aromatics, resins, and asphaltenes form a continuum of molecules with increasing molecular weight, aromaticity, and heteroatom contents.

Asphaltenes may also contain metals such as nickel and vanadium. This method is sometimes referred to as Asphaltene/Wax/Hydrate Deposition analysis.