Abstract
The environment impact of de-oiling and re-activation process of spent clay from oil industry was evaluated. The process includes many technical steps; de-oiling the entrained spent clay using solvent extraction techniques; solvent recovery process; re-activation process wherein the oil-free spent clay is treated with acid; and thermal polishing step at high temperature to increase the activity. Many solvents were used for de-oiling steps. The performance of solvent for oil recovery can be categorize as follow: Tri-chloromethane > di-chloromethane > MEK > stabilized condensate > 1-butanol > ethyl acetate > LPG condensate > toluene > hexane > 2-propanol The reactivated spent clay was applied for one step reclamation process of waste lubricating oil. It is adsorption–extraction process with solvent and additive. The activity of reactivated spent clay was compared with virgin clay during reclamation process. The reclaimed lubricating oil was analyzed for different physical properties. It was found that the reactivation process of spent clay from acid treatment followed by thermal treatment gave the best results.
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