Polar solvent-asphaltene dispersant method for upgrading heavy oils
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United States of America Patent
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Aug 25, 2009
Grant Date -
Jan 19, 2006
app pub date -
Jul 1, 2005
filing date -
Jul 16, 2004
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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.
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