Palm oil recirculating system for cold-strip mill

Claim 2

A palm oil recirculating system in a plant using lubricant palm oil together with cooling water and having a skimming tank for physically separating used palm oil from water, characterized in that the system comprises a metal removing vessel, which receives the used palm oil from the skimming tank and to which an acid is forced while heating and agitating the metal removing vessel so as to separate metal in the used palm oil as water soluble metal sulfate, which metal removing vessel has a valve selectively discharging water carrying the metal sulfates dissolved therein, a saponifying vessel receiving the palm oil from the metal removing vessel and caustic soda so as to saponify excess fatty acid in the palm oil into foots, a foots separator removing the foots by using difference of water solubilities between the foots and palm oil, and a moisture remover removing moisture from the palm oil so as to ready the palm oil for reuse in the plant.

Claim 3

A palm oil recirculating system for cold-strip mill using lubricant palm oil together with cooling water and having a skimming tank for physically separating used palm oil from water, characterized in that the system comprises an iron removing vessel, which receives the used palm oil from the skimming tank and to which sulfuric acid is forced together with steam from the cold-strip mill so as to separate iron in the used palm oil as water soluble iron sulfate, which iron removing vessel has a valve selectively discharging water carrying the iron sulfates dissolved therein, a saponifying vessel receiving the palm oil from the iron removing vessel and caustic soda so as to saponify excess fatty acid in the palm oil into foots, a foots separator removing the foots by using difference of hot water solubilities between the foots and palm oil, and a moisture remover removing moisture from the palm oil so as to ready the palm oil for reuse in the cold-strip mill.

Claim 4

A palm oil recirculating system for cold-strip mill using lubricant palm oil together with cooling water and having a skimming tank for physically separating used palm oil from water, characterized in that the system comprises an iron removing vessel, which receives the used palm oil from the skimming tank and to which sulfuric acid is forced together with steam from the cold-strip mill so as to separate iron in the used palm oil as water soluble iron sulfate, which iron removing vessel has a valve selectively discharging water carrying the iron sulfates dissolved therein, a saponifying vessel receiving the palm oil from the iron removing vessel and caustic soda so as to saponify excess fatty acid in the palm oil into foots, a foots separator removing the foots by using difference of hot water solubilities between the foots and palm oil, and a moisture remover removing moisture from the palm oil so as to ready the palm oil for reuse in the cold-strip mill.

Claim 5

A palm oil recirculating system according to claim 2, characterized in that the system further includes a reaction vessel which receives sulfuric acid, steam from the mill, and discharge waters from the skimming tank, the iron removing vessel, the foots separator, and the moisture remover so as to separate iron from the discharge waters as water soluble iron sulfates while heating and agitating the waters by the steam, which reaction vessel also decomposes the saponified fatty acids in the discharge waters by the sulfuric acid, which reaction vessel has a valve selectively discharging iron-containing water therefrom, a decomposing vessel which receives the output from the reaction vessel and fresh water for decomposing residual palm oil in the output from the reaction vessel into glycerine and fatty acids, said decomposing vessel having a valve selectively discharging water therefrom, and a distilling unit which distills the fatty acids from the glycerine.

Claim 6

A palm oil recirculating system according to claim 2, characterized in that a settling tank is disposed between the skimming tank and the iron removing vessel, so as to remove water from the used palm oil before delivering it to the iron removing vessel.

Claim 7

A palm oil recirculating system according to claim 2, characterized in that another settling tank is disposed between the saponifying vessel and the foots separator, so as to remove water from the output from the saponifying vessel before delivering it to the foots separator, based on the difference of water solubilities between the foots and palm oil.

Claim 8

A palm oil recirculating system accorDing to claim 2, characterized in that a temporary storage tank is disposed between the iron removing vessel and the saponifying vessel, so as to continuously feed the iron-free palm oil from the temporary storage tank to the saponifying vessel.

Claim 9

A palm oil recirculating system according to claim 3, characterized in that another skimming tank is provided between the first skimming tank and the reaction vessel, so as to further recollect palm oil from the discharge water of the first skimming tank.