| 摘要 |
A solvent extraction process for separating polar hydrocarbons from non-polar hydrocarbons. The solvent-rich extract phase from the extraction zone is introduced into a stripping column. The stripper bottoms, being a polar hydrocarbon-containing, first solvent-rich stream, is introduced into an upper portion of a solvent recovery column. A vaporous stripping medium is introduced into a lower portion of the solvent recovery column. A second solvent-rich stream, virtually free from hydrocarbons, is withdrawn as a bottoms product and recycled to the extraction zone, while a hydrocarbon-containing, side-cut third solvent-rich phase is withdrawn, and a portion introduced into the stripping column in admixture with the extract phase. Of the total recovery column solvent-rich streams, the amount commingled with the fresh hydrocarbon feed and introduced therewith into the extraction zone, is from about 5.0% to about 25.0% of the total solvent introduced thereto.
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