Distillation-induced extraction process
AssigneeMobil Oil Corporation
InventorsPhilip J. Angevine, Michael B. Carroll, Stuart S. Shih, Samuel A. Tabak
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Abstract
A process for multi-solvent extraction is provided wherein polarity gradients induced by distillation are utilized for the extraction of petroleum residua and other heavy oils whereby a high quality maltenic fraction and a lower quality asphaltenic fraction are obtained.
Claims7
An improved method of producing low CCR maltenic fractions and high CCR asphaltenic fractions from hydrocarbonaceous residua and other heavy oils by multisolvent-distillation-induced polarity gradient extraction comprising contacting two or more suitable solvents with said residua in a liquid flooded distillation column operating in a liquid continuous mode, said solvents having a high and a low boiling point with respect to one another, said higher boiling solvent having a higher relative polarity than said lower boiling solvent and each of said boiling points being sufficiently lower than that of the residua so that the solvents are distillted into high and low polarity fractions thereby forming a low CCR maltenic overhead stream and a high CCR asphaltenic bottoms stream and thereafter recovering the solvents from the overhead stream and the bottoms stream, and recycling the solvents for reuse.
Dependencies are inferred from the claim text.