| abstract |
The invention relates to a process for the recovery of aliphatic hydrocarbons from a liquid stream comprising aliphatic hydrocarbons, heteroatom containing organic compounds and optionally aromatic hydrocarbons, involving a) liquid-liquid extraction of said liquid stream with an extraction solvent; a1) membrane separation of the extract stream, comprising extraction solvent, heteroatom containing organic compounds and optionally aromatic hydrocarbons, into an extraction solvent-rich stream and a contaminant-rich stream comprising extraction solvent, heteroatom containing organic compounds and optionally aromatic hydrocarbons; b) mixing the contaminant-rich stream with a demixing solvent to remove heteroatom containing organic compounds and optional aromatic hydrocarbons; and c) separation of the remaining stream into a demixing solvent containing stream and an extraction solvent containing stream. Further, the invention relates to a process for the recovery of aliphatic hydrocarbons from plastics comprising the above-mentioned process; and to a process for steam cracking a hydrocarbon feed comprising aliphatic hydrocarbons as recovered in one of the above-mentioned processes. |