Density Anomalies in Crude Oil Blends Reflect Multiple Equilibrium States of Asphaltene Colloidal Aggregates

Evdokimov, Igor N.; Fesan, Aleksey A.; Losev, Aleksandr P.

doi:10.5772/intechopen.71813

Cited by 1 publication

(1 citation statement)

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“…The presence of such inflections in the dependence of ln on (1/T) in various oils at T*=40±10 o C has been observed in several studies (Evdokimov et al, 2018;Kondrasheva & Boytsova, 2017;Semikhina et al, 2018Semikhina et al, , 2019Semikhina & Korovin, 2021). Their cause is believed to be a phase transition within the particles of the disperse ODS phase.…”

Section: Resultsmentioning

confidence: 66%

Phase Transitions in Oil Disperse Systems and their Influence on the Thermochemical Process of Oil Dehydration

Semikhina,

Kovaleva,

Semekhin

2023

QAJ

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It is established that within the temperature range of oil dehydration in the fields, a phase transition occurs in oils, accompanied by a multifold change in the particle size of their dispersed phase. The study examines the method of assessing the temperature T* at which this process occurs based on the temperature dependence of oil viscosity. It is found that with T>T*, there are two effects taking place in oils that change the stability of oil-water emulsions in two opposite directions. Specifically, the reduction of oil viscosity facilitates a decrease in emulsion stability. In turn, increased emulsion stability is promoted by a rise in the content of natural emulsifiers in the oil disperse medium at T>T* due to a phase transition with a dramatic change in the particle size of the disperse phase. Therefore, the maximum speed and degree of oil dehydration is achieved at T*, which is confirmed experimentally. As a result, the need for a critical analysis of the oil treatment temperature regime used in the fields considering phase transitions within the particles of its dispersed phase is shown.

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