Nombre: PETTERSON SIMONASSI
Tipo: MSc dissertation
Fecha de publicación: 31/01/2018
Supervisor:

Nombre	Rol
MARIA DE FATIMA PEREIRA DOS SANTOS	Advisor *

Junta de examinadores:

Nombre	Rol
CEZAR AUGUSTO BIZZI	External Examiner *
MARIA DE FATIMA PEREIRA DOS SANTOS	Advisor *
MARISTELA DE ARAUJO VICENTE	Co advisor *

Resumen: In this work, a novel re-refining process of rail waste oil employing ultrasound waves
in polar solvent extraction of base oil is developed. The process consists in applying
ultrasound frequency acoustic waves directly, via ultrasound horn, into solvent and
waste oil mixture. Isopropanol, isobutanol and ethanol solvents were studied in the
extraction process. Extraction parameters of sonication time, wavelength, ultrasound
source position, horn geometry, solvent, solvent to waste oil mass ratio and vessel
geometry were evaluated. Samples were homogenized on temperature of 60 °C for 20
minutes and manually stirred for 5 minutes and then was incorporated to solvent and
sonicated. The operation conditions optimization has determined the best solvent to
waste oil ratio of 3:1, 5 minutes o of sonication and 20 % of wavelength. Re-refined oil
characterization was carried after phase separation and distillation of the interest
phase. Isobutanol solvent presented the best results for mass recuperation yield, with
56,51 % of recovery, while isopropanol and ethanol presented 17 and 13% mass yield
respectively. The best properties results were obtained with isobutanol recovered oil
being these Total Acid Number (0,1027 mg KOH/g), density at 40 °C (0,8959 g/cm³),
viscosity at 40 °C (140 cP) and the absorbance reduction in contaminant bands by
Fourrier transformed infrared spectroscopy evidences their removal, also decreasing
its acidity and viscosity. This technology of ultrasound assisted liquid-liquid extraction
presents an alternative for conventional extraction techniques, presenting low energy
and solvent consumption and not generating dangerous waste to environment.

Acceso al documento