Treatment of an oil-containing clay
AssigneeThe Nisshin Oil Mills, Ltd.
InventorsHiroo Ouchi, Noriyasu Saito
Life of this patent
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Abstract
In the decoloration of an animal and vegetable fat and oil with clay, an oil-containing clay is obtained as by-products. Good recovery of oil is attained by subjecting the oil-containing clay to an alkali treatment under high temperature and high pressure, adding an acid in an amount necessary for neutralization and removing the floating oil. Clay sludges and waste water after the recovery of oil can be easily disposed without causing the environmental contamination.
Claims8
A process for the recovery of oil from an oil-containing clay which has been by-produced in the decoloration of an animal and vegetable fat and oil with a decoloring agent consisting mainly of said clay, which comprises adding to said oil-containing clay, water and an alkali in an amount corresponding to at least the saponification value relative to the oil content thereof to obtain a slurry, treating the slurry at high temperature of about 110.degree. C. or more under high pressures of more than about 5 kg/cm.sup.2 to strip the oil portion, then adding an acid in an amount sufficient for neutralization to cause formation and surfacing of the oil portion primarily as fatty acids, separating and recovering the floating fatty acids and oil, and separating the clay-containing aqueous lower phase into clay sludges and waste water.
A process for the recovery of oil from an oil-containing clay which has been by-produced in the decoloration of an animal and vegetable fat and oil with a decoloring agent consisting mainly of said clay, which comprises adding to said oil-containing clay, water and an alkali in an amount corresponding to at least the saponification value relative to the oil content thereof to obtain a slurry, treating the slurry at high temperature of about 110.degree. C. or more under high pressures of more than about 5 kg/cm.sup.2 to saponify the oil portion, then adding an acid in an amount sufficient for neutralization to cause formation and surfacing of the oil portion primarily as fatty acids, separating and recovering the floating fatty acids and oil, and separating the clay-containing aqueous lower phase into clay sludges and waste water.
Dependencies are inferred from the claim text.