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

Lyudmila Semikhina; Irina Kovaleva; Dmitry Semekhin

doi:10.48161/qaj.v3n4a299

Authors

Lyudmila Semikhina Tyumen State University, Tyumen Industrial State University
Irina Kovaleva Tyumen State University, Tyumen Industrial State University
Dmitry Semekhin Tyumen State University

DOI:

https://doi.org/10.48161/qaj.v3n4a299

Keywords:

Oil viscosity, disperse systems, oil-water emulsions, phase transitions, the Eyring equation

Abstract

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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