Aromatics purification from petroleum streams
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United States of America Patent
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Aug 24, 2004
Grant Date -
Mar 6, 2003
app pub date -
Oct 21, 2002
filing date -
Apr 28, 2000
priority date (Note) -
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Abstract
A process for separating a feed mixture comprising at least one aromatic hydrocarbon and at least one non-aromatic hydrocarbon by extractive distillation (ED) utilizing a solvent mixture comprising sulfolane and at least one co-solvent. The co-solvent is an alkyl sulfolane having from 4 to 8 carbon atoms per molecule. The solvent mixture is added to the top of the ED column, and the feed mixture is added at a point on the ED column that is lower than the point where the solvent mixture is added. Extractive distillation is performed, and the aromatic and non-aromatic hydrocarbons are separated.
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