Plastic asphalts produced from residua of West Siberian crudes
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A study has been made of the physicochemical and rheological properties of oxidized asphalts obtained from residua of West Siberian crudes.
It has been shown that the nature of the feedstock has a decisive influence on the properties of the oxidized asphalts. The asphalts produced from a straight-run long residuum from West Siberian crudes have wide ranges of plasticity (91 and 111°C), low brittle points (−20 and −30°C), and better heat resistance than do the oxidized asphalts produced from a solvent-precipitated asphalt obtained in Stage II deasphalting.
It has been established that, as the degree of oxidation is increased, the asphaltene content of the asphalts increases sharply, and the amount of the most reactive bicyclic and polycyclic aromatic compounds decreases through conversion into resins and then asphaltenes; the amount of oxygen-containing groups increases, as evidenced by the IR spectra of the component groups of the asphalt.
The oxidized asphalts produced from residua of West Siberian crudes are highly structured systems within the interval of temperatures that was investigated (from 60 to 180°C); for a given penetration, the asphalt produced from the straight-run long residuum is more highly structured than that produced from the solvent-precipitated Stage II asphalt, as a consequence of the higher asphaltene content of the former.
KeywordsOxidation Brittle Asphalt Aromatic Compound Rheological Property
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