Tratamiento de crudos pesados por sonicación con el uso de iniciadores radicalarios

In this investigation, a heavy crude oil ultrasonic treatment with the use of selected thermal initiators was evaluated in order to upgrade the heavy crude oil transportation properties and fractional composition through the cavitation energy generated by the system. The proposed treatment was condu...

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Autores:: Daza Charry, David Alejandro

Tipo de recurso:: Work document

Fecha de publicación:: 2020

Institución:: Universidad Nacional de Colombia

Repositorio:: Universidad Nacional de Colombia

Idioma:: spa

Description
Summary:	In this investigation, a heavy crude oil ultrasonic treatment with the use of selected thermal initiators was evaluated in order to upgrade the heavy crude oil transportation properties and fractional composition through the cavitation energy generated by the system. The proposed treatment was conducted in two main steps. The first one involved the ultrasonic preparation and stability evaluation of heavy crude oil-in-water emulsions to generate high uniformity in their droplet size distribution and viscosity reductions in comparison with the base heavy crude oil, which were employed as the treatment medium for the use of persulfate initiators in the petroleum upgrading process. The main results of this step showed viscosity reductions up to 98% (500s-1 25°C) in comparison with the base heavy crude oil, droplet diameters of 4μm and volumetric stabilities up to 90% over 10 days for the emulsions (60/40) (O/W) prepared with concentrations of 2.5% of the surfactant merpol HCS, using ultrasonic amplitudes and induction times up to 70% and 12min, respectively, that leads to an energy consumption of 574.6 kJ per kg of processed crude oil. After the definition of the treatment medium, the properties of the crude oil, such as viscosity, residue, distillates and asphaltene content, were measured after several ultrasonic treatments (ultrasonic induction times and amplitude of 5 to 30min and 80%, respectively) at 60°C and atmospheric pressure, with the use of the initiators potassium persulfate and ammonium persulfate, the chain transfer agent n-dodecyl mercaptan and the hydrogen donors cyclohexane and decahydronaphthalene in order to identify possible upgrading changes in the crude oil. The main results of this study showed that despite of the slight changes generated in the distillates fraction by the ultrasonic treatments, it is possible to achieve high viscosity, asphaltene and coke reductions up to 65%, 42% and 37%, respectively, for the treated crude oils with the initiator potassium persulphate 0.5wt.%) and the hydrogen donor decahydronaphthalene (5.0wt.%) at ultrasonic induction times of 5min (energy consumption of 259.9 kJ per kg of crude oil), which shows the potential of the technology in transportation and processing applications of heavy crude oils.

Tratamiento de crudos pesados por sonicación con el uso de iniciadores radicalarios

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