| 摘要 |
The invention provides a high octane number gasoline pool comprises at least 2% of di-branched paraffins containing 7 carbon atoms, and a process for producing this gasoline pool by hydro-isomerising a feed constituted by a C5 to C8 cut which comprises at least one hydro-isomerisation section and at least one separation section, in which the hydro-isomerisation section comprises at least one reactor. The separation section comprises at least one unit and produces at least two streams: a first stream which is rich in di- and tri-branched paraffins, and possibly in naphthenes and aromatic compounds which is sent to the gasoline pool; and in a first version of the process, a second stream is produced which is rich in straight-chain and mono-branched paraffins which is recycled to the inlet of the hydro-isomerisation section, while in a second version of the process, a second flux is produced which is rich in straight-chain paraffins which is recycled to the inlet of a first hydro-isomerisation section and a third stream is produced which is rich in mono-branched paraffins which is recycled to the inlet of a second hydro-isomerisation section.
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