الفهرس 
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Abstract
This study aims to re-refining used lube oil using solvent extraction technique. The characteristics of used oil, methods of utilization and recycling, the adverse effect on humans and the environment, and the comparison between the methods of re-refining have been clarified. Experiments were carried out on used lubricating oils which are collected from the output of pre-treatment unit in used oil re-refining department at Alexandria Petroleum Company, where the removal of impurities, water and diesel fuel through filters and then vacuum distilling were done. Several mixtures of solvents belong to the group of alcohols, such as butanol and Isopropanol and ketones such as methyl ethyl ketone and acetone and hydrocarbons such as hexane. Mixing based on the basis of the presence of solvent belongs to alcohols and other solvent Assistant or secondary belongs to a group of ketones or hydrocarbon, in order to choose the most suitable mixture gives a higher percentage of separation, taking into account absence of impurities in the sample. Different variables were studied to clarify their impact on extraction process such as proportions of solvent mixture and weight ratio between composite solvent and used oil. Two types of mixtures such as butyl alcohol with methyl ethyl ketone and a mixture of isopropanol with methyl ethyl ketone were chosen to give highest extraction yield. Results indicated that the best extraction yield which is 92.2% was established by using mixture of butanol with methyl ethyl ketone by weight ratio of 1:1 with addition of potassium hydroxide (2 gm / kg solvent) and solvent to oil weight ratio of 6:1, at temperature of 25 oC , mixing time of 5 minutes and mixing speed of 250 r.p.m.The effects of three experimental parameters on the extraction yield such as temperature, mixing time, and mixing speed were investigated statistically. Box-Behnken design was used to study the factors affecting the extraction yield. Mathematical model equations were derived for the percent of extraction yield by using the experimental data and the statistic software package MINITAB (version 17). Statistic model was established to provide the relations between variables. Optimum conditions were selected to provide extraction yield of 96% at 25oC, mixing time of 15 min. and mixing speed of 50 r.p.m. Coefficient of determination (R2=0.943) is close to 1, indicating that the model did not explain only 5.69 % of total variations.
Analysis of the resulting oil, pretreated used oil, and used oil was made. It was found that the characteristics of re-refined oil relatively close to the standard specifications. It is possible