Compatibility and rheology of bio-oil blends with light and heavy crude oils

[Display omitted] •Bio-oil is an invert emulsion exhibiting shear-thinning over a wide temperature range.•Light oil is a suspension at low temperatures and can therefore have a yield stress.•Heavy oil appears homogeneous and shows non-Newtonian behavior at high shear rates.•Bio- and light oils are i...

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Veröffentlicht in:Fuel (Guildford) 2022-04, Vol.314, p.122761, Article 122761
Hauptverfasser: Yadykova, Anastasiya Y., Ilyin, Sergey O.
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Sprache:eng
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Zusammenfassung:[Display omitted] •Bio-oil is an invert emulsion exhibiting shear-thinning over a wide temperature range.•Light oil is a suspension at low temperatures and can therefore have a yield stress.•Heavy oil appears homogeneous and shows non-Newtonian behavior at high shear rates.•Bio- and light oils are incompatible and form multiple emulsions with a yield stress.•Bio/heavy oil blends may be macroscopically compatible but are still emulsions. The morphological features, thermophysical properties, and rheology of bio-oil in comparison with light and heavy crude oils have been studied and analyzed. It has been demonstrated that bio-oil is a water-in-oil emulsion, light crude oil is a suspension of paraffin waxes in oil medium, and heavy crude oil is a homogeneous liquid. All oil samples have low-temperature phase transitions, which are most likely associated with crystallization of saturated compounds included in their composition. As a result, light oil and bio-oil are viscoelastic fluids that have a yield stress at low temperatures but demonstrate a Newtonian or weakly expressed non-Newtonian behavior, respectively, when heated. Heavy crude oil is viscoelastic fluid over a wide temperature range with a viscosity that decreases slightly but only at high shear stresses. Binary blends of bio-oil with fossil oils were studied with the content of components from 20 to 80 wt%. All bio-oil/crude oil blends are emulsions, the type of which depends on the ratio of oils. Due to limited miscibility between hydrocarbons of fossil oils and the oil phase of bio-oil, macroscopically compatible blends are formed only when heavy crude oil is mixed with bio-oil at a low content of the latter. It is shown that mixing light crude oil with bio-oil is not rational in terms of improving rheology of any of these oils, while the combination of bio-oil with heavy crude oil can slightly reduce the viscosity of the latter.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2021.122761