Name: TOMAS SAITER LINS
Type: MSc dissertation
Publication date: 27/02/2018
Advisor:
Name |
Role |
|---|---|
| MARIA DE FATIMA PEREIRA DOS SANTOS | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| GISELE DE LORENA DINIZ CHAVES | Internal Examiner * |
| MARIA DE FATIMA PEREIRA DOS SANTOS | Advisor * |
| MARISTELA DE ARAUJO VICENTE | Co advisor * |
| RENATO DO NASCIMENTO SIQUEIRA | External Examiner * |
Summary: This study is based on the search of a new used lubricating oil (ULO) re-refining route. Founded on the solvent extraction of base oils and looking forward to create a low cost and low environmental impact process, the ultrasound technology was used to induce optimal extraction conditions using local extracting solvents. The lubricating oil studied is a mineral oil, developed to work in internal combustion engines with compression ignition (Diesel cycle). The ultrasound is applied using an ultrasound probe system and, to optimize the process, the implicated variables were evaluated. Both the used oil and the recovered base oil were characterized to evaluate the efficiency of the process, based on the reduction of contaminants and on the modification of physical and chemical characteristics of the oils. The yield reached, using isopropylic alcohol, was over 30% (grecovered base oil/gused oil). The yield using isobutilic alcohol, combining mechanical and ultrasound systems of incorporation, was superior to 70%. The results of density and °API obtained were 0,894 g/cm3 and 26,1 °API for the base oil extracted with isopropilic alcohol and 0,864 g/cm3 e 29,4 °API for the oil extracted with isobutilic alcohol. The density and API of the ULO were 0.885 g/cm3 and 27.7 °API. The dynamic viscosity underwent modifications: from 105,0 mPa s in the commercial oil to 81,6 mPa s in the ULO and to 47,7 mPa s and 31,4 mPa s in the base oils extracted by isobutilic and isopropilic alcohols. The metal analysis of the recovered lubricant oil showed a reduction in the concentration of some metals: Al (75.9%), Ca (87.6%), Cr (86.7%), Fe (80.3% 84.8%) and Mg (53.8%). For Pb the reduction was considerable: 99.4%. Other metals present increased concentration: Cu (274.5%); Na (166.5%); Zn (140.4%); And Si (1710%). The infrared spectrometry indicated that base oils obtained by different solvents show distinct identities.
