PROCESS FOR CONTINUOUS SOLVENT ERTRACTION-STEAM DISTILLATION

摘要

A continuous solvent extn.-steam distn. process for the recovery of C6-16 hydrocarbons from a feed stream contg. C5-16 aromatic and aliphatic compds. is described. Initially the solvent extract is transferred to a two-stage distn. process at the output streams, which are heat-exchanged with the feed streams to reduce energy requirements. At least part of the solvent-rich, partially vaporized material from the bottom of the first column is passed to a heat exchanger and used to heat the lean solvent stream from the base of the second distn. zone. The heated material is fed to the top of the second distn. column where steam removes the aroamtic compds.