Influence of resins and asphaltenes on the structural and rheological properties of petroleum disperse systems

Influence of resins and asphaltenes on the structural and rheological properties of petroleum disperse systems

Asphaltenes

Rheology

Particle size

Gasoline

Mixtures

Resins

Paraffins

Paraffin oils

Petroleum chemistry

Activation energy

The structural and rheological properties of resin-free model petroleum mixtures (MPM) with an asphaltene content of 0 to 6 wt % and the same mixtures with added 3.85 wt % petroleum resins have been investigated. The composition of the mixtures simulates the amount of the main hydrocarbon-group components and distillate fractions in light paraffin-base oils (420 = 747.7789.1 kg/m3). Temperaturedynamic viscosity relationships for cooling the MPM have been obtained, most of which displayed abnormalities in the temperature range of ~4060C. Calculations of the viscous-flow activation energy (E) have shown that there are abrupt changes in E in this abnormality region, which are an indication of structuring processes. By means of Fourier-transform laser diffractomery of MPM solutions in kerosene, it has been found that the particle size of the petroleum mixtures is qualitatively related to the revealed abrupt changes in E. It has been shown that these abnormalities correspond to the formation of paraffinasphaltene associates and their existence is determined by the critical concentration of resins and asphaltenes in the mixtures. 2017, Pleiades Publishing, Ltd.

203-208

3

57

Petroleum Chemistry

2017

Nelyubov, D.V.

Semikhina, L.P.

Vazhenin, D.A.

Merkulev, I.A.

journalArticle

9655441

10.1134/S0965544117010091