Process for the solvent extraction of aromatics and the recovery of an aromatics-free non-aromatic product from a hydrocarbon feedstock

摘要

A process for the solvent extraction of aromatic hydrocarbons from a mixture thereof with non-aromatic hydrocarbons, and for the recovery of a non-aromatic fraction substantially free of aromatic hydrocarbons, is disclosed. Said mixture is treated with an aromatic-selective solvent in a first extraction zone to provide an aromatic-rich solvent stream and a non-aromatic raffinate stream. The rich solvent stream is treated in a first solvent recovery zone to provide a high purity aromatic stream and a lean solvent stream. One portion of the lean solvent stream is recycled to the first extraction zone, and residual aromatic hydrocarbons are stripped from the remaining portion. This aromatics-free solvent is then utilized to extract residual aromatics from a fraction of the non-aromatic raffinate to provide a high purity paraffin stream.