Mineral oils: processes and products – Refining – Purifying used oil
Patent
1994-07-28
1995-12-26
Hruskoci, Peter A.
Mineral oils: processes and products
Refining
Purifying used oil
208182, 123196A, 210729, 210732, 210735, 210749, 210806, B01D 3700
Patent
active
054784638
ABSTRACT:
A method, composition and filter for reducing the presence of sludge or varnish precursors in a lubricating oil circulating within an internal combustion engine. The lubricating oil containing sludge or varnish precursors is contacted with discrete particles of an oil insoluble, oil wettable compound having an antioxidant functional group and/or a dispersant functional group, which are capable of complexing with sludge or varnish precursors. Preferably the compounds comprises a crosslinked amine having ethylene amine functionality. The starting polyethylene amines have a number average molecular weight in the range of about 100 to about 60,000, preferably 200 to 250 and are crosslinked with a silicon oxide, silane, silicate, epoxide, quinone, or phenol-formaldehyde crosslinking agent. The particles are encaged within a one or two stage oil filter together with filtering media such as chemically active filter media, physically active filter media and inactive filter media.
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Brownawell Darrell W.
Emert Jacob
Jones Cruise K.
Patil Abhimanyu O.
Thaler Warren A.
Allen Mary M.
Exxon Chemical Patents Inc.
Hruskoci Peter A.
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