| CPC C10G 53/08 (2013.01) [C10G 1/002 (2013.01); C10G 1/10 (2013.01); C10G 55/04 (2013.01); C10G 2300/202 (2013.01)] | 10 Claims |
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1. A process for the recovery of aliphatic hydrocarbons from a liquid hydrocarbon feedstock stream from waste plastics comprising aliphatic hydrocarbons, heteroatom containing organic compounds and optionally aromatic hydrocarbons, said process comprising the steps of:
a) mixing at least part of the liquid hydrocarbon feedstock stream with a washing solvent a) which contains one or more heteroatoms and separating the resulting mixture into a first stream comprising washing solvent a) and heteroatom containing compounds and a second stream comprising aliphatic hydrocarbons, heteroatom containing organic compounds and optionally aromatic hydrocarbons; and
b) contacting at least part of the second stream resulting from step a) with an extraction solvent b) which contains one or more heteroatoms and subjecting that stream to liquid-liquid extraction with extraction solvent b), resulting in a first stream comprising aliphatic hydrocarbons and optionally heteroatom containing organic compounds and a second stream comprising extraction solvent b), heteroatom containing organic compounds and optionally aromatic hydrocarbons;
wherein:
(i) during step a), at least part of the liquid hydrocarbon feedstock stream is contacted with a sorption agent before the first and second streams are separated in step a); and
(ii) between a step preceding step a) and the step a), at least part of a second stream resulting from the step preceding step a) is contacted with a sorption agent; and
(iii) between steps a) and b), at least part of the second stream resulting from step a) is contacted with a sorption agent; and
(iv) the first stream resulting from step b) comprises aliphatic hydrocarbons and heteroatom containing organic compounds and, after step b), at least part of that stream is contacted with a sorption agent.
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