Polar solvent-asphaltene dispersant method for upgrading...

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

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C208S039000, C208S045000

Reexamination Certificate

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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.

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