Patent ID: 6398948
Filing Date: 2002-06-04
Classification: C10G,C10M

Abstract:
A method of removing contaminants from used oil comprising the steps of:causing a continuous flow of used oil; mixing the used oil with a base introduced at such a rate as to maintain the base at about 1 weight % to about 10 weight % of the used oil; mixing the used oil/base mixture with a phase transfer catalyst introduced at such a rate as to maintain the phase transfer catalyst at about 1 weight % to about 10 weight % of the used oil; heating the composition to a temperature between about 200Â° C. and about 275Â° C.; separating the resultant mixture using a first distillation at a temperature of from about 200Â° C. to about 275Â° C. and a pressure of from about 100 torr to about 200 torr; and purifying the used oil using a second distillation at a temperature of from about 275Â° C. to about 300Â° C. and a pressure of from about 0.05 torr to about 0.20 torr.