Нефтегазовые нанотехнологии для разработки и эксплуатации месторождений. Часть 3. Евдокимов И.Н - 14 стр.

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paper the authors report the values of CMC and CAS at various

temperatures, but do not plot the respective temperature depend-

encies. In Fig. 6 we show such a plot for toluene solutions of as-

phaltenes where the temperatures in the vicinity of 28°C are

clearly singled out indisputably due to some physicochemical proc-

esses involving asphaltenes.

Fig. 6. Non-monotonous temperature

dependencies of critical aggregation

concentrations of asphaltenes in toluene

(adapted from Ramos et al., 2001).

Conclusions

Measurements of various properties of asphaltene-containing flu-

ids indicate the existence of a specific temperature close to 28°C,

apparently singled out by some noticeable transformation of as-

phaltene colloids. The transformed structures are evidently equi-

librium above 28

C and are quenched to a long-lived (up to six

months) metastable (transient) state at lower temperatures. This

state may be easily resolved from the corresponding equilibrium

one by a well-defined difference in the values of the liquid’s bulk

properties.

References

Andersen S.I., and Christensen S.D. 2000. Energy Fuels. 14: 38.

Brenner C. 1975. Canad. J. Chem. Engr. 53: 126.

Evdokimov I.N., Eliseev N.Yu., and Eliseev D.Yu. 2001. J. Petrol. Sci. Eng.

30(3-4): 199.