What is SARA analysis?

Saturate, Aromatic, Resin and Asphaltene (SARA) is an analysis method that divides crude oil components according to their polarizability and polarity. The saturate fraction consists of nonpolar material including linear, branched, and cyclic saturated hydrocarbons (paraffins).

What is the SARA analysis and how we can separate different components of crude oil?

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.

What are resins in crude oil?

Resins fraction of crude oil comprises polar molecules often containing heteroatoms such as nitrogen, oxygen, or sulfur. Resin is a heavier fraction than aromatics and saturates. Resins are com- posed of fused aromatic rings with branched paraffin and polar compounds.

What is Sara bitumen?

SARA is an analysis method that devides bitumen components according to their polarizability and polarity.

What are asphaltenes in bitumen?

Asphaltenes are generally defined as crude oil fractions that are n-alkanes insoluble and toluene soluble. (12) During solvent injection, hydrocarbon solvents containing n-alkanes (e.g., pentane or heptane) dilute the bitumen, which results in precipitation of asphaltenes.

How do you remove asphaltenes?

Asphaltene deposits are generally removed manually, if present in readily accessible equipment, such as separators and other surface equipment. For tubular and flowline deposits, removal techniques involve chemical methods such as solvent soaks with or without dispersants.

What is C5 and C9?

C5 aliphatic and C9 aromatic resins can be modified by mixing the two feed streams together at a carefully chosen ratio to produce hybrid polymers. This ratio determines the aliphatic/aromatic balance of the resin, which is an essential determinant of the resin’s compatibility.

What is C7 asphaltene?

The results show that C7-asphaltene units are mainly composed of polycyclic aromatics linked in side with a few and short aliphatic chains (mainly n-alkane less than 3 C atoms). The asphaltene units have small average molecular weights and there is no aromatic sheet stacking structure existing.

How do you prevent asphaltene?

4.2. One method to prevent or reduce asphaltene deposition in the wells is to control pressure, temperature and/or flow rate to avoid the conditions where asphaltenes precipitate.

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