Optimum conditions of extracting the fat absorbed with the exhausted earth

ABSTRACT

Three different spent clay samples named spent clay produced from bleaching of hydrogenated oil [I], spent clay produced from bleaching of oil then filtered through normal non closed filter [II] and spent clay produced from bleaching of oil then filtered through closed filter [III] were available from the Extracted Oil Company and investigated in laboratory. Many factors like the effects of different solvents, time of extraction, temperature of heating and solvent to clay ratio on the percentage of oil extracted were investigated. The aim of this study is to estimate the optimum conditions for recovering the maximum oil as a waste of oil industry from the spent clay. The authors found that n-hexane and petroleum ether 60/80 at 70°C, 6 hr heating and clay [solid] solvent [liquid] ratio 595 w/v gave the highest percentage of oil recovery. The physical and chemical characteristics of the oils of the three samples were determined. The results indicated using these oils for industrial purposes: