Solvent deasphalting by polarity gradient extraction
AssigneeMobil Oil Corporation
InventorsStuart S. Shih, Samuel A. Tabak, Philip J. Angevine, Michael B. Carroll
Life of this patent
Estimating the term…
Abstract
An improved method for deasphalting residua or heavy oils comprises the use of at least two solvents in an extraction column to establish a liquid polarity gradient within it.
Claims22
An improved method for deasphalting a feedstock in an extraction column by contacting said feedstock with solvent under conditions to produce a raffinate and an extract phase, the improvement wherein said feedstock is contacted with at least two polar solvents, the least polar of which is injected into said column at a point nearest the column end nearest the raffinate take-off stream point and the most polar of which is injected into said column at a point nearest the column end with the extract take-off stream point.
Dependencies are inferred from the claim text.