Mineral oils: processes and products – Refining – Purifying used oil
Patent
1976-10-22
1978-02-14
Gantz, Delbert E.
Mineral oils: processes and products
Refining
Purifying used oil
208181, 208184, C10M 1100
Patent
active
040737209
ABSTRACT:
A method for purifying and reclaiming used lubricating oils containing additives such as detergents, antioxidants, corrosion inhibitors, extreme pressure agents and the like and other solid and liquid contaminants by preferably first vacuum distilling the used oil to remove water and low-boiling contaminants, and treating the dried oil with a solvent mixture of butanol, isopropanol and methylethyl ketone which causes the separation of a layer of sludge containing contaminants, unspent additives and oxidation products. After solvent recovery, the desludged oil is then subjected to conventional lubricating oil refining steps such as distillation followed by decolorization and deodorization.
REFERENCES:
patent: 1766768 (1930-06-01), Werkenthin
patent: 2270837 (1942-01-01), Jones
patent: 3639229 (1972-02-01), Brownawell et al.
patent: 3763036 (1973-10-01), Jordan et al.
patent: 3819508 (1974-06-01), Fainman et al.
Cotton Faye O.
Goetzinger John W.
Whisman Marvin L.
Carlson Dean E.
Gantz Delbert E.
Hellwege James W.
Jackson Frank H.
The United States of America as represented by the United States
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