Deashing and demetallization of used oil using a membrane process
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United States of America Patent
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Sep 12, 2000
Grant Date -
N/A
app pub date -
Aug 19, 1998
filing date -
Aug 22, 1997
priority date (Note) -
Expired
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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 having less than 10 ppm of at least one of the contaminants and less than 0.15 wt. % of ash content. The method comprises providing a body of oil to be purified and chemically treating the oil to condition ash and metals contained therein to facilitate removal of ash and metal during membrane purification of the oil. A porous inorganic membrane module having a high pressure side and a low pressure side is provided and the chemically treated oil is introduced to the high pressure side of the membrane module to provide an oil permeate on the low pressure side and an ash and metal-rich concentrate on the high pressure side thereby separating ash and metals from the oil to provide the highly purified oil product at an improved level of throughput of the membrane compared to feed oil not chemically treated.
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