Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic sulfur compound – wherein the sulfur is single bonded...
Reexamination Certificate
2005-07-01
2009-08-25
Griffin, Walter D (Department: 1797)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic sulfur compound, wherein the sulfur is single bonded...
C208S039000, C208S045000
Reexamination Certificate
active
07579303
ABSTRACT:
A method for reducing the viscosity and toluene equivalence of an oil containing asphaltenes comprises the steps of: a) mixing with the oil, a polar solvent, and an asphaltene dispersant additive wherein the weight ratio of oil:polar solvent is in the range of 10:0.1 to 10:5, the asphaltene dispersant additive is at a treat rate in the range of 0.025 to 5 weight percent based on the weight of the oil, and then, b) removing at least 90 wt % of the polar solvent from the mixture of oil, polar solvent and the asphaltene dispersant additive to provide upgraded oil with reduced viscosity and toluene equivalence.
REFERENCES:
patent: 4713117 (1987-12-01), Goodrich
patent: 6569821 (2003-05-01), Ibrahim et al.
patent: 2004/0232044 (2004-11-01), Mukkamala
patent: 2004/0235684 (2004-11-01), Cook et al.
Brons Cornelius Hendrick
Varadaraj Ramesh
Campanell Frank C
Exxonmobil Research and Engineering Company
Griffin Walter D
Katz Gary P.
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