Patent ID: 6179999
Filing Date: 2001-01-30
Classification: C10G,C10M

Abstract:
A method of purifying used oil comprising the steps of:placing used oil into a continuous flow apparatus;contacting 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 oil composition;contacting the used oil 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 oil composition;heating the composition to a temperature between about 200.degree. C. and about 275.degree. C.;mixing the composition;separating the resultant mixture using a first distillation at a temperature of from about 200.degree. C. to about 275.degree. C. and a pressure of from about 100 torr to about 200 torr; andpurifying the used oil using a second distillation at a temperature of from about 275.degree. C. to about 300.degree. C. and a pressure of from about 0.05 torr to about 0.20 torr.