Separation method of high-temperature Fischer-Tropsch synthetic light oil

Abstract

The application provides a method for simultaneously removing oxygen-containing compounds and aromatics from high-temperature Fischer-Tropsch synthetic light oil, comprising: subjecting the light oil and a composite extractant to a countercurrent single-stage or multi-stage extraction process in an extraction equipment, to obtain a raffinate phase stream, and an extract phase stream of oxygen-containing compounds+aromatics; washing the raffinate phase stream with water, to obtain a raffinate oil stream, from which oxygen-containing compounds and aromatics have been removed, and a water stream containing a small amount of extractants; and subjecting the extract phase stream to an extractive distillation process, to obtain a recycled stream rich in alkanes and olefins and a recycled solvent-rich stream, and carrying out a regeneration cycle on the solvent-rich stream through a solvent recovery tower and a regeneration distillation tower. Oxygen-containing compounds, and aromatics in the light oil are removed together.

Dependencies are inferred from the claim text.