Patent ID: 6117327
Filing Date: 2000-09-12
Classification: B01D,C10M

Abstract:
A method suitable for treating used oil to remove ash and metal contaminants therefrom with minimum oxidation of the oil, the metal including at least one of the components of iron, lead, copper, zinc, sodium, magnesium, and calcium, to provide a highly purified oil product, the method consisting essentially of:(a) providing a body of oil to be purified;(b) chemically treating at least a portion of said oil at a temperature not greater than 200.degree. C. to form said ash and metals in the oil into a material rejectable during membrane purification of said oil;(c) providing a porous inorganic membrane module having a high pressure side and a low pressure side; and(d) introducing said chemically treated oil to the high pressure side of said membrane module to provide an oil permeate on the low pressure side and an ash and metal-rich concentrate on the high pressure side to separate ash and metals from said oil to provide said highly purified oil product at an improved level of throughput of said membrane compared to feed oil not chemically treated.