Mineral oils: processes and products – Fractionation – Liquid extraction with solvents
Reexamination Certificate
2005-05-10
2005-05-10
Griffin, Walter D. (Department: 1764)
Mineral oils: processes and products
Fractionation
Liquid extraction with solvents
C208S313000, C208S031000, C208S033000, C208S035000, C208S037000, C208S038000, C208S028000
Reexamination Certificate
active
06890425
ABSTRACT:
A method of refining a petroleum product to remove aromatics and to separate paraffinic oils and waxes is provided. The method involves the utilization of phase equilibria wherein crystallized or solidified waxes, normally present in the petroleum product, are used to remove oils from a liquid solvent phase containing dissolved aromatics present in the unrefined petroleum product. The wax containing the oils is separated from the aromatic-containing solvent and is further processed to separate the waxes and oils. For petroleum products containing little, if any, wax, additional wax may be added and recycled back for further use in removing oils from the petroleum product. The method has particular application in preparing lubricating oils having a high viscosity index, where the presence of aromatics and wax can be detrimental.
REFERENCES:
patent: 4081352 (1978-03-01), West et al.
patent: 4273645 (1981-06-01), Audeh et al.
patent: 4328092 (1982-05-01), Sequeira, Jr.
patent: 4381234 (1983-04-01), Audeh et al.
patent: 4909927 (1990-03-01), Bell
patent: 4911821 (1990-03-01), Katzer et al.
patent: 5006222 (1991-04-01), Sequeira, Jr.
patent: 5171426 (1992-12-01), Mead et al.
patent: 5196116 (1993-03-01), Ackerson et al.
patent: 5234597 (1993-08-01), Welmers et al.
patent: 5474668 (1995-12-01), Ackerson et al.
patent: 5616238 (1997-04-01), Boyle et al.
patent: 5620588 (1997-04-01), Akcerson et al.
patent: 5853564 (1998-12-01), Ackerson et al.
patent: 6024862 (2000-02-01), Ackerson et al.
Ackerson Michael D.
Byars Michael Steven
Bergen Grady K.
Griffin Walter D.
Nguyen Tam M.
Process Dynamics, Inc.
LandOfFree
Solvent extraction refining of petroleum products does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Solvent extraction refining of petroleum products, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solvent extraction refining of petroleum products will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3460227