Abstract
The article uses a magneto-sorption method for extracting asphaltenes from petroleum fractions using nanosized magnetite. Factors affecting the sorption separation of asphaltenes from toluene were evaluated using model systems prepared by dissolving asphaltenes isolated from superviscous oil from the Ashalchinskoye field (Tatarstan). It was found that the presence of polar compounds has the greatest effect on the sorption of asphaltenes from toluene solutions. Benzoic acid or isopropyl alcohol was used to evaluate the effect of acids and polar compounds. To study the effect of solution viscosity on asphaltene adsorption, model solutions of polystyrene in toluene with different viscosities were prepared by adding different amounts of polymer. Two types of sorbents were investigated: magnetite powder and suspensions of magnetite, modified with oleic acid, in toluene and n-pentane. The efficiency of using magnetite suspensions in comparison with its powder for sorption of asphaltenes is shown: for a suspension in toluene sorption increases 5 times, and in n-pentane, sorption increases 14 times. The influence of a magnetic field (0.5 T) on the increase in the sorption of asphaltenes from light oil feedstock was revealed: for a suspension in n-pentane, sorption increases from 220 ± 25 to 313 ± 38 g/g of adsorbent). The increase in sorption in the samples that passed through the magnetic installation is explained by the greater availability of asphaltenes due to the destruction of some of their clusters.
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