Aromatics extraction from hydrocarbon oil using tetramethylene sulfoxide
AssigneeExxon Research & Engineering Co.
InventorsSandra J. Alward, William N. Hayter
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Abstract
Aromatic hydrocarbons are selectively extracted from lube oil stocks comprising mixtures of same with non-aromatic hydrocarbons using tetramethyl sulfoxide as the extraction solvent. The oils so extracted are the heavier oils, those boiling above about 200.degree. C. and identified as being at least lube base stock grade 60N and higher.
Claims8
A method for removing aromatic hydrocarbons from hydrocarbon lube oil feedstocks boiling above about 200.degree. C. comprising contacting the feedstock with tetramethyl sulfoxide solvent (TMSO) thereby producing a raffinate of reduced aromatic hydrocarbon content and an extract containing a majority of the TMSO solvent and an increased aromatic hydrocarbon content as compared to the starting feedstock.
Dependencies are inferred from the claim text.