Huge amounts of ud lubricating oils from automotive sources are disposed of as a harmful waste into the environment. For this reason, means to recover and reuse these wastes need to be found. Problems arising from acid treatment include environmental problems associated with the disposal of acid sludge and spent earth, low product yield (45-65%) and incomplete removal of metals. The processes of re-refining of used lubricating oils depend greatly on the nature of the oil base stock and on the nature and amount of contaminants in the lubricant resulting from operations. The re-refining process of used oil consists of dehydration, solvent extraction, solvent stripping and vacuum distillation. The objective of the study is to re-refine used engine oil sample from motor vehicle and to investigate a process of solvent extraction of an alcohol-ketone mixture as a pre-treatment step followed by vacuum distillation. The primary step would be conducted before the solvent extraction which would involve dehydration to remove the water and fuel contaminants from the used oil by vacuum distillation. The solvent extraction and vacuum distillation steps would be used to remove higher molecular weight contaminants. The solvent composition is methanol, acetone, chloroform, and dimethyl sulfoxide. The percentage oil recovery for different solvent to oil ratio would be investigated. Finally, the re-refined oil properties would be compared with the commercial virgin lubricating oil properties.
FOR FULL PROJECT, CLICK THE “DOWNLOAD” BUTTON ABOVE TO PURCHASE AND DOWNLOAD