The process involves three sub- processes comprising of a) Reacting the spent bleaching earth with a solvent selected from a group consisting of toluene, acetone, xylene, isopropyl alcohol or n- hexane at a temperature between 35°C. to 50°C.; b) Separating the solids and liquid from slurry formed in the previous step; and c) Extracting oil from the liquid fraction obtained in the previous step. The separation of the solids and the liquid from slurry can be achieved in two steps. The slurry mixture of solids and liquid is first separated into a solid fraction and a liquid fraction . The solid fraction so separated sll contains a significant poron of oil. Therefore, the solid & liquid fraction is reacted with some solvent. The other slurry of solids and liquids is again separated into a solid fraction and a liquid fraction .
Typical Vegetable Oil Physical Refining process involves the Degumming of Crude Vegetable Oils such as Palm Oil to remove Gums and Phosphades by Hydraon with Phosphoric Acid, which is then seled out as Soap Stock. This reduces the Phosphades in the Oil to approx. 20ppm. This oil is then bleached with Acvated Earth in order to reduce the color in the Oil and, more importantly, to remove Peroxides, Residual Gums and Soaps which sll exist, despite the prior separaon process Industries such as the Crude Palm Oil Refining industry, large quanes of Spent Earth is generated and there exists a strong need to recover the Oil in the Spent Earth in an economical manner.
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